sebastienros.jint/Jint/Native/TypedArray/IntrinsicTypedArrayPrototype.cs

#pragma warning disable CA1859 // Use concrete types when possible for improved performance -- most of prototype methods return JsValue

using System.Linq;
using System.Text;
using Jint.Collections;
using Jint.Native.Array;
using Jint.Native.ArrayBuffer;
using Jint.Native.Iterator;
using Jint.Native.Number;
using Jint.Native.Object;
using Jint.Native.Symbol;
using Jint.Runtime;
using Jint.Runtime.Descriptors;
using Jint.Runtime.Descriptors.Specialized;
using Jint.Runtime.Interop;

namespace Jint.Native.TypedArray;

/// <summary>
/// https://tc39.es/ecma262/#sec-properties-of-the-%typedarrayprototype%-object
/// </summary>
internal sealed class IntrinsicTypedArrayPrototype : Prototype
{
    private readonly IntrinsicTypedArrayConstructor _constructor;
    private ClrFunction? _originalIteratorFunction;

    internal IntrinsicTypedArrayPrototype(
        Engine engine,
        ObjectInstance objectPrototype,
        IntrinsicTypedArrayConstructor constructor) : base(engine, engine.Realm)
    {
        _prototype = objectPrototype;
        _constructor = constructor;
    }

    protected override void Initialize()
    {
        const PropertyFlag LengthFlags = PropertyFlag.Configurable;
        const PropertyFlag PropertyFlags = PropertyFlag.Writable | PropertyFlag.Configurable;
        var properties = new PropertyDictionary(36, false)
        {
            ["at"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "at", prototype.At, 1, PropertyFlag.Configurable), PropertyFlags),
            ["buffer"] = new GetSetPropertyDescriptor(new ClrFunction(_engine, "get buffer", Buffer, 0, LengthFlags), Undefined, PropertyFlag.Configurable),
            ["byteLength"] = new GetSetPropertyDescriptor(new ClrFunction(_engine, "get byteLength", ByteLength, 0, LengthFlags), Undefined, PropertyFlag.Configurable),
            ["byteOffset"] = new GetSetPropertyDescriptor(new ClrFunction(_engine, "get byteOffset", ByteOffset, 0, LengthFlags), Undefined, PropertyFlag.Configurable),
            ["constructor"] = new(_constructor, PropertyFlag.NonEnumerable),
            ["copyWithin"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "copyWithin", prototype.CopyWithin, 2, PropertyFlag.Configurable), PropertyFlags),
            ["entries"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "entries", prototype.Entries, 0, PropertyFlag.Configurable), PropertyFlags),
            ["every"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "every", prototype.Every, 1, PropertyFlag.Configurable), PropertyFlags),
            ["fill"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "fill", prototype.Fill, 1, PropertyFlag.Configurable), PropertyFlags),
            ["filter"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "filter", prototype.Filter, 1, PropertyFlag.Configurable), PropertyFlags),
            ["find"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "find", prototype.Find, 1, PropertyFlag.Configurable), PropertyFlags),
            ["findIndex"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "findIndex",prototype. FindIndex, 1, PropertyFlag.Configurable), PropertyFlags),
            ["findLast"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "findLast", prototype.FindLast, 1, PropertyFlag.Configurable), PropertyFlags),
            ["findLastIndex"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "findLastIndex", prototype.FindLastIndex, 1, PropertyFlag.Configurable), PropertyFlags),
            ["forEach"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "forEach", prototype.ForEach, 1, PropertyFlag.Configurable), PropertyFlags),
            ["includes"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "includes", prototype.Includes, 1, PropertyFlag.Configurable), PropertyFlags),
            ["indexOf"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "indexOf", prototype.IndexOf, 1, PropertyFlag.Configurable), PropertyFlags),
            ["join"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "join", prototype.Join, 1, PropertyFlag.Configurable), PropertyFlags),
            ["keys"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "keys", prototype.Keys, 0, PropertyFlag.Configurable), PropertyFlags),
            ["lastIndexOf"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "lastIndexOf", prototype.LastIndexOf, 1, PropertyFlag.Configurable), PropertyFlags),
            ["length"] = new GetSetPropertyDescriptor(new ClrFunction(_engine, "get length", GetLength, 0, LengthFlags), Undefined, PropertyFlag.Configurable),
            ["map"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "map", prototype.Map, 1, PropertyFlag.Configurable), PropertyFlags),
            ["reduce"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "reduce", prototype.Reduce, 1, PropertyFlag.Configurable), PropertyFlags),
            ["reduceRight"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "reduceRight", prototype.ReduceRight, 1, PropertyFlag.Configurable), PropertyFlags),
            ["reverse"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "reverse", prototype.Reverse, 0, PropertyFlag.Configurable), PropertyFlags),
            ["set"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "set", prototype.Set, 1, PropertyFlag.Configurable), PropertyFlags),
            ["slice"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "slice", prototype.Slice, 2, PropertyFlag.Configurable), PropertyFlags),
            ["some"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "some", prototype.Some, 1, PropertyFlag.Configurable), PropertyFlags),
            ["sort"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "sort", prototype.Sort, 1, PropertyFlag.Configurable), PropertyFlags),
            ["subarray"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "subarray", prototype.Subarray, 2, PropertyFlag.Configurable), PropertyFlags),
            ["toLocaleString"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "toLocaleString", prototype.ToLocaleString, 0, PropertyFlag.Configurable), PropertyFlags),
            ["toReversed"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "toReversed", prototype.ToReversed, 0, PropertyFlag.Configurable), PropertyFlags),
            ["toSorted"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "toSorted", prototype.ToSorted, 1, PropertyFlag.Configurable), PropertyFlags),
            ["toString"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "toLocaleString", prototype._realm.Intrinsics.Array.PrototypeObject.ToString, 0, PropertyFlag.Configurable), PropertyFlags),
            ["values"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "values", prototype.Values, 0, PropertyFlag.Configurable), PropertyFlags),
            ["with"] = new LazyPropertyDescriptor<IntrinsicTypedArrayPrototype>(this, static prototype => new ClrFunction(prototype._engine, "with", prototype.With, 2, PropertyFlag.Configurable), PropertyFlags),
        };
        SetProperties(properties);

        _originalIteratorFunction = new ClrFunction(_engine, "iterator", Values, 1);
        var symbols = new SymbolDictionary(2)
        {
            [GlobalSymbolRegistry.Iterator] = new(_originalIteratorFunction, PropertyFlags),
            [GlobalSymbolRegistry.ToStringTag] = new GetSetPropertyDescriptor(new ClrFunction(_engine, "get [Symbol.toStringTag]", ToStringTag, 0, PropertyFlag.Configurable), Undefined, PropertyFlag.Configurable)
        };
        SetSymbols(symbols);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-get-%typedarray%.prototype.buffer
    /// </summary>
    private JsValue Buffer(JsValue thisObject, JsValue[] arguments)
    {
        var o = thisObject as JsTypedArray;
        if (o is null)
        {
            ExceptionHelper.ThrowTypeError(_realm);
        }

        return o._viewedArrayBuffer;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-get-%typedarray%.prototype.bytelength
    /// </summary>
    private JsValue ByteLength(JsValue thisObject, JsValue[] arguments)
    {
        var o = thisObject as JsTypedArray;
        if (o is null)
        {
            ExceptionHelper.ThrowTypeError(_realm);
        }

        var taRecord = MakeTypedArrayWithBufferWitnessRecord(o, ArrayBufferOrder.SeqCst);
        return JsNumber.Create(taRecord.TypedArrayByteLength);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-get-%typedarray%.prototype.byteoffset
    /// </summary>
    private JsValue ByteOffset(JsValue thisObject, JsValue[] arguments)
    {
        var o = thisObject as JsTypedArray;
        if (o is null)
        {
            ExceptionHelper.ThrowTypeError(_realm);
        }

        var taRecord = MakeTypedArrayWithBufferWitnessRecord(o, ArrayBufferOrder.SeqCst);
        if (taRecord.IsTypedArrayOutOfBounds)
        {
            return JsNumber.PositiveZero;
        }

        return JsNumber.Create(o._byteOffset);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-get-%typedarray%.prototype.length
    /// </summary>
    private JsValue GetLength(JsValue thisObject, JsValue[] arguments)
    {
        var o = thisObject as JsTypedArray;
        if (o is null)
        {
            ExceptionHelper.ThrowTypeError(_realm);
        }

        var taRecord = MakeTypedArrayWithBufferWitnessRecord(o, ArrayBufferOrder.SeqCst);
        if (taRecord.IsTypedArrayOutOfBounds)
        {
            return JsNumber.PositiveZero;
        }

        return JsNumber.Create(taRecord.TypedArrayLength);
    }

    internal readonly record struct TypedArrayWithBufferWitnessRecord(JsTypedArray Object, int CachedBufferByteLength)
    {
        /// <summary>
        /// https://tc39.es/ecma262/#sec-istypedarrayoutofbounds
        /// </summary>
        public bool IsTypedArrayOutOfBounds
        {
            get
            {
                var o = Object;
                var bufferByteLength = CachedBufferByteLength;
                if (bufferByteLength == -1)
                {
                    return true;
                }

                var byteOffsetStart = o._byteOffset;
                long byteOffsetEnd;
                if (o._arrayLength == JsTypedArray.LengthAuto)
                {
                    byteOffsetEnd = bufferByteLength;
                }
                else
                {
                    var elementSize = o._arrayElementType.GetElementSize();
                    byteOffsetEnd = byteOffsetStart + o._arrayLength * elementSize;
                }

                if (byteOffsetStart > bufferByteLength || byteOffsetEnd > bufferByteLength)
                {
                    return true;
                }

                return false;
            }
        }

        /// <summary>
        /// https://tc39.es/ecma262/#sec-typedarraylength
        /// </summary>
        public uint TypedArrayLength
        {
            get
            {
                var o = Object;
                if (o._arrayLength != JsTypedArray.LengthAuto)
                {
                    return o._arrayLength;
                }

                var byteOffset  = o._byteOffset;
                var elementSize = o._arrayElementType.GetElementSize();
                var byteLength = (double) CachedBufferByteLength;
                var floor = System.Math.Floor((byteLength - byteOffset) / elementSize);
                return floor < 0 ? 0 : (uint) floor;
            }
        }

        /// <summary>
        /// https://tc39.es/ecma262/#sec-typedarraybytelength
        /// </summary>
        public uint TypedArrayByteLength
        {
            get
            {
                if (IsTypedArrayOutOfBounds)
                {
                    return 0;
                }

                var length = TypedArrayLength;
                if (length == 0)
                {
                    return 0;
                }

                var o = Object;
                if (o._byteLength != JsTypedArray.LengthAuto)
                {
                    return o._byteLength;
                }

                return length * o._arrayElementType.GetElementSize();
            }
        }
    }

    internal static TypedArrayWithBufferWitnessRecord MakeTypedArrayWithBufferWitnessRecord(JsTypedArray obj, ArrayBufferOrder order)
    {
        var buffer = obj._viewedArrayBuffer;
        var byteLength = buffer.IsDetachedBuffer
            ? -1
            : ArrayBufferByteLength(buffer, order);

        return new TypedArrayWithBufferWitnessRecord(obj, byteLength);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-arraybufferbytelength
    /// </summary>
    internal static int ArrayBufferByteLength(JsArrayBuffer arrayBuffer, ArrayBufferOrder order)
    {
        if (arrayBuffer.IsSharedArrayBuffer && arrayBuffer.ArrayBufferByteLength > 0)
        {
            // a. Let bufferByteLengthBlock be arrayBuffer.[[ArrayBufferByteLengthData]].
            // b. Let rawLength be GetRawBytesFromSharedBlock(bufferByteLengthBlock, 0, BIGUINT64, true, order).
            // c. Let isLittleEndian be the value of the [[LittleEndian]] field of the surrounding agent's Agent Record.
            // d. Return ℝ(RawBytesToNumeric(BIGUINT64, rawLength, isLittleEndian)).
        }

        return arrayBuffer.ArrayBufferByteLength;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.copywithin
    /// </summary>
    private JsValue CopyWithin(JsValue thisObject, JsValue[] arguments)
    {
        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var target = arguments.At(0);
        var start = arguments.At(1);
        var end = arguments.At(2);

        var relativeTarget = TypeConverter.ToIntegerOrInfinity(target);

        long to;
        if (double.IsNegativeInfinity(relativeTarget))
        {
            to = 0;
        }
        else if (relativeTarget < 0)
        {
            to = (long) System.Math.Max(len + relativeTarget, 0);
        }
        else
        {
            to = (long) System.Math.Min(relativeTarget, len);
        }

        var relativeStart = TypeConverter.ToIntegerOrInfinity(start);

        long from;
        if (double.IsNegativeInfinity(relativeStart))
        {
            from = 0;
        }
        else if (relativeStart < 0)
        {
            from = (long) System.Math.Max(len + relativeStart, 0);
        }
        else
        {
            from = (long) System.Math.Min(relativeStart, len);
        }

        var relativeEnd = end.IsUndefined()
            ? len
            : TypeConverter.ToIntegerOrInfinity(end);

        long final;
        if (double.IsNegativeInfinity(relativeEnd))
        {
            final = 0;
        }
        else if (relativeEnd < 0)
        {
            final = (long) System.Math.Max(len + relativeEnd, 0);
        }
        else
        {
            final = (long) System.Math.Min(relativeEnd, len);
        }

        var count = System.Math.Min(final - from, len - to);

        if (count > 0)
        {
            var buffer = o._viewedArrayBuffer;
            buffer.AssertNotDetached();

            taRecord = MakeTypedArrayWithBufferWitnessRecord(o, ArrayBufferOrder.SeqCst);
            if (taRecord.IsTypedArrayOutOfBounds)
            {
                ExceptionHelper.ThrowTypeError(_realm, "TypedArray is out of bounds");
            }

            len = taRecord.TypedArrayLength;
            var elementSize = o._arrayElementType.GetElementSize();
            var byteOffset = o._byteOffset;
            var bufferByteLimit = len * elementSize + byteOffset;
            var toByteIndex = to * elementSize + byteOffset;
            var fromByteIndex = from * elementSize + byteOffset;
            var countBytes = count * elementSize;

            int direction;
            if (fromByteIndex < toByteIndex && toByteIndex < fromByteIndex + countBytes)
            {
                direction = -1;
                fromByteIndex = fromByteIndex + countBytes - 1;
                toByteIndex = toByteIndex + countBytes - 1;
            }
            else
            {
                direction = 1;
            }

            while (countBytes > 0)
            {
                if (fromByteIndex < bufferByteLimit && toByteIndex < bufferByteLimit)
                {
                    var value = buffer.GetValueFromBuffer((int) fromByteIndex, TypedArrayElementType.Uint8, isTypedArray: true, ArrayBufferOrder.Unordered);
                    buffer.SetValueInBuffer((int) toByteIndex, TypedArrayElementType.Uint8, value, isTypedArray: true, ArrayBufferOrder.Unordered);
                    fromByteIndex += direction;
                    toByteIndex += direction;
                    countBytes--;
                }
                else
                {
                    countBytes = 0;
                }
            }
        }

        return o;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.entries
    /// </summary>
    private JsValue Entries(JsValue thisObject, JsValue[] arguments)
    {
        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        return _realm.Intrinsics.ArrayIteratorPrototype.Construct(o, ArrayIteratorType.KeyAndValue);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.every
    /// </summary>
    private JsValue Every(JsValue thisObject, JsValue[] arguments)
    {
        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        if (len == 0)
        {
            return JsBoolean.True;
        }

        var predicate = GetCallable(arguments.At(0));
        var thisArg = arguments.At(1);

        var args = _engine._jsValueArrayPool.RentArray(3);
        args[2] = o;
        for (var k = 0; k < len; k++)
        {
            args[0] = o[k];
            args[1] = k;
            if (!TypeConverter.ToBoolean(predicate.Call(thisArg, args)))
            {
                return JsBoolean.False;
            }
        }

        _engine._jsValueArrayPool.ReturnArray(args);

        return JsBoolean.True;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.fill
    /// </summary>
    private JsValue Fill(JsValue thisObject, JsValue[] arguments)
    {
        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var jsValue = arguments.At(0);
        var start = arguments.At(1);
        var end = arguments.At(2);

        JsValue value;
        if (o._contentType == TypedArrayContentType.BigInt)
        {
            value = JsBigInt.Create(jsValue.ToBigInteger(_engine));
        }
        else
        {
            value = JsNumber.Create(jsValue);
        }

        int k;
        var relativeStart = TypeConverter.ToIntegerOrInfinity(start);
        if (double.IsNegativeInfinity(relativeStart))
        {
            k = 0;
        }
        else if (relativeStart < 0)
        {
            k = (int) System.Math.Max(len + relativeStart, 0);
        }
        else
        {
            k = (int) System.Math.Min(relativeStart, len);
        }

        uint endIndex;
        var relativeEnd = end.IsUndefined() ? len : TypeConverter.ToIntegerOrInfinity(end);
        if (double.IsNegativeInfinity(relativeEnd))
        {
            endIndex = 0;
        }
        else if (relativeEnd < 0)
        {
            endIndex = (uint) System.Math.Max(len + relativeEnd, 0);
        }
        else
        {
            endIndex = (uint) System.Math.Min(relativeEnd, len);
        }

        taRecord = MakeTypedArrayWithBufferWitnessRecord(o, ArrayBufferOrder.SeqCst);
        if (taRecord.IsTypedArrayOutOfBounds)
        {
            ExceptionHelper.ThrowTypeError(_realm, "TypedArray is out of bounds");
        }

        len = taRecord.TypedArrayLength;
        endIndex = System.Math.Min(endIndex, len);

        o._viewedArrayBuffer.AssertNotDetached();

        for (var i = k; i < endIndex; ++i)
        {
            o[i] = value;
        }

        return thisObject;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.filter
    /// </summary>
    private JsValue Filter(JsValue thisObject, JsValue[] arguments)
    {
        var callbackfn = GetCallable(arguments.At(0));
        var thisArg = arguments.At(1);

        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var kept = new List<JsValue>();
        var captured = 0;

        var args = _engine._jsValueArrayPool.RentArray(3);
        args[2] = o;
        for (var k = 0; k < len; k++)
        {
            var kValue = o[k];
            args[0] = kValue;
            args[1] = k;
            var selected = callbackfn.Call(thisArg, args);
            if (TypeConverter.ToBoolean(selected))
            {
                kept.Add(kValue);
                captured++;
            }
        }

        _engine._jsValueArrayPool.ReturnArray(args);

        var a = _realm.Intrinsics.TypedArray.TypedArraySpeciesCreate(o, new JsValue[] { captured });
        for (var n = 0; n < captured; ++n)
        {
            a[n] = kept[n];
        }

        return a;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.find
    /// </summary>
    private JsValue Find(JsValue thisObject, JsValue[] arguments)
    {
        return DoFind(thisObject, arguments).Value;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.findindex
    /// </summary>
    private JsValue FindIndex(JsValue thisObject, JsValue[] arguments)
    {
        return DoFind(thisObject, arguments).Key;
    }

    private JsValue FindLast(JsValue thisObject, JsValue[] arguments)
    {
        return DoFind(thisObject, arguments, fromEnd: true).Value;
    }

    private JsValue FindLastIndex(JsValue thisObject, JsValue[] arguments)
    {
        return DoFind(thisObject, arguments, fromEnd: true).Key;
    }

    private KeyValuePair<JsValue, JsValue> DoFind(JsValue thisObject, JsValue[] arguments, bool fromEnd = false)
    {
        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var predicate = GetCallable(arguments.At(0));
        var thisArg = arguments.At(1);

        if (len == 0)
        {
            return new KeyValuePair<JsValue, JsValue>(JsNumber.IntegerNegativeOne, Undefined);
        }

        var args = _engine._jsValueArrayPool.RentArray(3);
        args[2] = o;
        if (!fromEnd)
        {
            for (var k = 0; k < len; k++)
            {
                var kNumber = JsNumber.Create(k);
                var kValue = o[k];
                args[0] = kValue;
                args[1] = kNumber;
                if (TypeConverter.ToBoolean(predicate.Call(thisArg, args)))
                {
                    return new KeyValuePair<JsValue, JsValue>(kNumber, kValue);
                }
            }
        }
        else
        {
            for (var k = (int) (len - 1); k >= 0; k--)
            {
                var kNumber = JsNumber.Create(k);
                var kValue = o[k];
                args[0] = kValue;
                args[1] = kNumber;
                if (TypeConverter.ToBoolean(predicate.Call(thisArg, args)))
                {
                    return new KeyValuePair<JsValue, JsValue>(kNumber, kValue);
                }
            }
        }

        return new KeyValuePair<JsValue, JsValue>(JsNumber.IntegerNegativeOne, Undefined);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.foreach
    /// </summary>
    private JsValue ForEach(JsValue thisObject, JsValue[] arguments)
    {
        var callbackfn = GetCallable(arguments.At(0));
        var thisArg = arguments.At(1);

        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var args = _engine._jsValueArrayPool.RentArray(3);
        args[2] = o;
        for (var k = 0; k < len; k++)
        {
            var kValue = o[k];
            args[0] = kValue;
            args[1] = k;
            callbackfn.Call(thisArg, args);
        }

        _engine._jsValueArrayPool.ReturnArray(args);

        return Undefined;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.includes
    /// </summary>
    private JsValue Includes(JsValue thisObject, JsValue[] arguments)
    {
        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        if (len == 0)
        {
            return false;
        }

        var searchElement = arguments.At(0);
        var fromIndex = arguments.At(1, 0);

        var n = TypeConverter.ToIntegerOrInfinity(fromIndex);
        if (double.IsPositiveInfinity(n))
        {
            return JsBoolean.False;
        }
        else if (double.IsNegativeInfinity(n))
        {
            n = 0;
        }

        long k;
        if (n >= 0)
        {
            k = (long) n;
        }
        else
        {
            k = (long) (len + n);
            if (k < 0)
            {
                k = 0;
            }
        }

        while (k < len)
        {
            var value = o[(int) k];
            if (SameValueZeroComparer.Equals(value, searchElement))
            {
                return JsBoolean.True;
            }

            k++;
        }

        return JsBoolean.False;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.indexof
    /// </summary>
    private JsValue IndexOf(JsValue thisObject, JsValue[] arguments)
    {
        var searchElement = arguments.At(0);
        var fromIndex = arguments.At(1);

        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        if (len == 0)
        {
            return JsNumber.IntegerNegativeOne;
        }

        var n = TypeConverter.ToIntegerOrInfinity(fromIndex);
        if (double.IsPositiveInfinity(n))
        {
            return JsNumber.IntegerNegativeOne;
        }
        else if (double.IsNegativeInfinity(n))
        {
            n = 0;
        }

        long k;
        if (n >= 0)
        {
            k = (long) n;
        }
        else
        {
            k = (long) (len + n);
            if (k < 0)
            {
                k = 0;
            }
        }

        for (; k < len; k++)
        {
            var kPresent = o.HasProperty(k);
            if (kPresent)
            {
                var elementK = o[(int) k];
                if (elementK == searchElement)
                {
                    return k;
                }
            }
        }

        return JsNumber.IntegerNegativeOne;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.join
    /// </summary>
    private JsValue Join(JsValue thisObject, JsValue[] arguments)
    {
        var separator = arguments.At(0);

        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var sep = TypeConverter.ToString(separator.IsUndefined() ? JsString.CommaString : separator);
        // as per the spec, this has to be called after ToString(separator)
        if (len == 0)
        {
            return JsString.Empty;
        }

        static string StringFromJsValue(JsValue value)
        {
            return value.IsUndefined()
                ? ""
                : TypeConverter.ToString(value);
        }

        var s = StringFromJsValue(o[0]);
        if (len == 1)
        {
            return s;
        }

        using var result = new ValueStringBuilder();
        result.Append(s);
        for (var k = 1; k < len; k++)
        {
            result.Append(sep);
            result.Append(StringFromJsValue(o[k]));
        }

        return result.ToString();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.keys
    /// </summary>
    private JsValue Keys(JsValue thisObject, JsValue[] arguments)
    {
        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        return _realm.Intrinsics.ArrayIteratorPrototype.Construct(o, ArrayIteratorType.Key);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.lastindexof
    /// </summary>
    private JsValue LastIndexOf(JsValue thisObject, JsValue[] arguments)
    {
        var searchElement = arguments.At(0);

        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        if (len == 0)
        {
            return JsNumber.IntegerNegativeOne;
        }

        var fromIndex = arguments.At(1, len - 1);
        var n = TypeConverter.ToIntegerOrInfinity(fromIndex);

        if (double.IsNegativeInfinity(n))
        {
            return JsNumber.IntegerNegativeOne;
        }

        long k;
        if (n >= 0)
        {
            k = (long) System.Math.Min(n, len - 1);
        }
        else
        {
            k = (long) (len + n);
        }

        for (; k >= 0; k--)
        {
            var kPresent = o.HasProperty(k);
            if (kPresent)
            {
                var elementK = o[(int) k];
                if (elementK == searchElement)
                {
                    return k;
                }
            }
        }

        return JsNumber.IntegerNegativeOne;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.map
    /// </summary>
    private ObjectInstance Map(JsValue thisObject, JsValue[] arguments)
    {
        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var thisArg = arguments.At(1);
        var callable = GetCallable(arguments.At(0));

        var a = _realm.Intrinsics.TypedArray.TypedArraySpeciesCreate(o, new JsValue[] { len });
        var args = _engine._jsValueArrayPool.RentArray(3);
        args[2] = o;
        for (var k = 0; k < len; k++)
        {
            args[0] = o[k];
            args[1] = k;
            var mappedValue = callable.Call(thisArg, args);
            a[k] = mappedValue;
        }

        _engine._jsValueArrayPool.ReturnArray(args);
        return a;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.reduce
    /// </summary>
    private JsValue Reduce(JsValue thisObject, JsValue[] arguments)
    {
        var callbackfn = GetCallable(arguments.At(0));
        var initialValue = arguments.At(1);

        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        if (len == 0 && arguments.Length < 2)
        {
            ExceptionHelper.ThrowTypeError(_realm);
        }

        var k = 0;
        var accumulator = Undefined;
        if (!initialValue.IsUndefined())
        {
            accumulator = initialValue;
        }
        else
        {
            accumulator = o[k];
            k++;
        }

        var args = _engine._jsValueArrayPool.RentArray(4);
        args[3] = o;
        while (k < len)
        {
            var kValue = o[k];
            args[0] = accumulator;
            args[1] = kValue;
            args[2] = k;
            accumulator = callbackfn.Call(Undefined, args);
            k++;
        }

        _engine._jsValueArrayPool.ReturnArray(args);

        return accumulator;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.reduceright
    /// </summary>
    private JsValue ReduceRight(JsValue thisObject, JsValue[] arguments)
    {
        var callbackfn = GetCallable(arguments.At(0));
        var initialValue = arguments.At(1);

        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        if (len == 0 && arguments.Length < 2)
        {
            ExceptionHelper.ThrowTypeError(_realm);
        }

        var k = (long) len - 1;
        JsValue accumulator;
        if (arguments.Length > 1)
        {
            accumulator = initialValue;
        }
        else
        {
            accumulator = o[k];
            k--;
        }

        var jsValues = _engine._jsValueArrayPool.RentArray(4);
        jsValues[3] = o;
        for (; k >= 0; k--)
        {
            jsValues[0] = accumulator;
            jsValues[1] = o[(int) k];
            jsValues[2] = k;
            accumulator = callbackfn.Call(Undefined, jsValues);
        }

        _engine._jsValueArrayPool.ReturnArray(jsValues);
        return accumulator;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.reverse
    /// </summary>
    private ObjectInstance Reverse(JsValue thisObject, JsValue[] arguments)
    {
        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var middle = (int) System.Math.Floor(len / 2.0);
        var lower = 0;
        while (lower != middle)
        {
            var upper = len - lower - 1;

            var lowerValue = o[lower];
            var upperValue = o[upper];

            o[lower] = upperValue;
            o[upper] = lowerValue;

            lower++;
        }

        return o;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.set
    /// </summary>
    private JsValue Set(JsValue thisObject, JsValue[] arguments)
    {
        var target = thisObject as JsTypedArray;
        if (target is null)
        {
            ExceptionHelper.ThrowTypeError(_realm);
        }

        var source = arguments.At(0);
        var offset = arguments.At(1);

        var targetOffset = TypeConverter.ToIntegerOrInfinity(offset);
        if (targetOffset < 0)
        {
            ExceptionHelper.ThrowRangeError(_realm, "Invalid offset");
        }

        if (source is JsTypedArray typedArrayInstance)
        {
            SetTypedArrayFromTypedArray(target, targetOffset, typedArrayInstance);
        }
        else
        {
            SetTypedArrayFromArrayLike(target, (int) targetOffset, source);
        }

        return Undefined;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-settypedarrayfromtypedarray
    /// </summary>
    private void SetTypedArrayFromTypedArray(JsTypedArray target, double targetOffset, JsTypedArray source)
    {
        var targetBuffer = target._viewedArrayBuffer;
        var targetRecord = MakeTypedArrayWithBufferWitnessRecord(target, ArrayBufferOrder.SeqCst);
        if (targetRecord.IsTypedArrayOutOfBounds)
        {
            ExceptionHelper.ThrowTypeError(_realm);
        }

        var targetLength = targetRecord.TypedArrayLength;

        var srcBuffer = source._viewedArrayBuffer;
        var srcRecord = MakeTypedArrayWithBufferWitnessRecord(source, ArrayBufferOrder.SeqCst);
        if (srcRecord.IsTypedArrayOutOfBounds)
        {
            ExceptionHelper.ThrowTypeError(_realm);
        }

        var targetType = target._arrayElementType;
        var targetElementSize = targetType.GetElementSize();
        var targetByteOffset = target._byteOffset;

        var srcType = source._arrayElementType;
        var srcElementSize = srcType.GetElementSize();
        var srcLength = srcRecord.TypedArrayLength;
        var srcByteOffset = source._byteOffset;

        if (double.IsNegativeInfinity(targetOffset))
        {
            ExceptionHelper.ThrowRangeError(_realm, "Invalid target offset");
        }

        if (srcLength + targetOffset > targetLength)
        {
            ExceptionHelper.ThrowRangeError(_realm, "Invalid target offset");
        }

        if (target._contentType != source._contentType)
        {
            ExceptionHelper.ThrowTypeError(_realm, "Content type mismatch");
        }

        var same = SameValue(srcBuffer, targetBuffer);
        int srcByteIndex;
        if (same)
        {
            var srcByteLength = srcRecord.TypedArrayByteLength;
            srcBuffer = srcBuffer.CloneArrayBuffer(_realm.Intrinsics.ArrayBuffer, srcByteOffset, srcByteLength);
            // %ArrayBuffer% is used to clone srcBuffer because is it known to not have any observable side-effects.
            srcByteIndex = 0;
        }
        else
        {
            srcByteIndex = srcByteOffset;
        }

        var targetByteIndex = (int) (targetOffset * targetElementSize + targetByteOffset);
        var limit = targetByteIndex + targetElementSize * srcLength;

        if (srcType == targetType)
        {
            // NOTE: If srcType and targetType are the same, the transfer must be performed in a manner that preserves the bit-level encoding of the source data.
            while (targetByteIndex < limit)
            {
                var value = srcBuffer.GetValueFromBuffer(srcByteIndex, TypedArrayElementType.Uint8, isTypedArray: true, ArrayBufferOrder.Unordered);
                targetBuffer.SetValueInBuffer(targetByteIndex, TypedArrayElementType.Uint8, value, isTypedArray: true, ArrayBufferOrder.Unordered);
                srcByteIndex += 1;
                targetByteIndex += 1;
            }
        }
        else
        {
            while (targetByteIndex < limit)
            {
                var value = srcBuffer.GetValueFromBuffer(srcByteIndex, srcType, isTypedArray: true, ArrayBufferOrder.Unordered);
                targetBuffer.SetValueInBuffer(targetByteIndex, targetType, value, isTypedArray: true, ArrayBufferOrder.Unordered);
                srcByteIndex += srcElementSize;
                targetByteIndex += targetElementSize;
            }
        }
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-settypedarrayfromarraylike
    /// </summary>
    private void SetTypedArrayFromArrayLike(JsTypedArray target, int targetOffset, JsValue source)
    {
        var targetBuffer = target._viewedArrayBuffer;
        targetBuffer.AssertNotDetached();

        var targetRecord = MakeTypedArrayWithBufferWitnessRecord(target, ArrayBufferOrder.SeqCst);
        if (targetRecord.IsTypedArrayOutOfBounds)
        {
            ExceptionHelper.ThrowTypeError(_realm);
        }

        var targetLength = targetRecord.TypedArrayLength;
        var src = ArrayOperations.For(_realm, source, forWrite: false);
        var srcLength = src.GetLength();

        if (double.IsNegativeInfinity(targetOffset))
        {
            ExceptionHelper.ThrowRangeError(_realm, "Invalid target offset");
        }

        if (srcLength + targetOffset > targetLength)
        {
            ExceptionHelper.ThrowRangeError(_realm, "Invalid target offset");
        }

        var k = 0;
        while (k < srcLength)
        {
            var jsValue = src.Get((ulong) k);
            target.IntegerIndexedElementSet(targetOffset + k, jsValue);
            k++;
        }
    }

    /// <summary>
    /// https://tc39.es/proposal-relative-indexing-method/#sec-%typedarray.prototype%-additions
    /// </summary>
    private JsValue At(JsValue thisObject, JsValue[] arguments)
    {
        var start = arguments.At(0);

        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var relativeStart = TypeConverter.ToInteger(start);
        int k;

        if (relativeStart < 0)
        {
            k = (int) (len + relativeStart);
        }
        else
        {
            k = (int) relativeStart;
        }

        if (k < 0 || k >= len)
        {
            return Undefined;
        }

        return o.Get(k);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.slice
    /// </summary>
    private JsValue Slice(JsValue thisObject, JsValue[] arguments)
    {
        var start = arguments.At(0);
        var end = arguments.At(1);

        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var relativeStart = TypeConverter.ToIntegerOrInfinity(start);
        int k;
        if (double.IsNegativeInfinity(relativeStart))
        {
            k = 0;
        }
        else if (relativeStart < 0)
        {
            k = (int) System.Math.Max(len + relativeStart, 0);
        }
        else
        {
            k = (int) System.Math.Min(relativeStart, len);
        }

        var relativeEnd = end.IsUndefined()
            ? len
            : TypeConverter.ToIntegerOrInfinity(end);

        long final;
        if (double.IsNegativeInfinity(relativeEnd))
        {
            final = 0;
        }
        else if (relativeEnd < 0)
        {
            final = (long) System.Math.Max(len + relativeEnd, 0);
        }
        else
        {
            final = (long) System.Math.Min(relativeEnd, len);
        }

        var count = System.Math.Max(final - k, 0);
        var a = _realm.Intrinsics.TypedArray.TypedArraySpeciesCreate(o, new JsValue[] { count });

        if (count > 0)
        {
            o._viewedArrayBuffer.AssertNotDetached();
            var srcType = o._arrayElementType;
            var targetType = a._arrayElementType;
            if (srcType != targetType)
            {
                var n = 0;
                while (k < final)
                {
                    var kValue = o[k];
                    a[n] = kValue;
                    k++;
                    n++;
                }
            }
            else
            {
                var srcBuffer = o._viewedArrayBuffer;
                var targetBuffer = a._viewedArrayBuffer;
                var elementSize = srcType.GetElementSize();
                var srcByteOffset = o._byteOffset;
                var targetByteIndex = a._byteOffset;
                var srcByteIndex = (int) k * elementSize + srcByteOffset;
                var limit = targetByteIndex + count * elementSize;
                while (targetByteIndex < limit)
                {
                    var value = srcBuffer.GetValueFromBuffer(srcByteIndex, TypedArrayElementType.Uint8, true, ArrayBufferOrder.Unordered);
                    targetBuffer.SetValueInBuffer(targetByteIndex, TypedArrayElementType.Uint8, value, true, ArrayBufferOrder.Unordered);
                    srcByteIndex++;
                    targetByteIndex++;
                }
            }
        }

        return a;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.some
    /// </summary>
    private JsValue Some(JsValue thisObject, JsValue[] arguments)
    {
        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var callbackfn = GetCallable(arguments.At(0));
        var thisArg = arguments.At(1);

        var args = _engine._jsValueArrayPool.RentArray(3);
        args[2] = o;
        for (var k = 0; k < len; k++)
        {
            args[0] = o[k];
            args[1] = k;
            if (TypeConverter.ToBoolean(callbackfn.Call(thisArg, args)))
            {
                return JsBoolean.True;
            }
        }

        _engine._jsValueArrayPool.ReturnArray(args);
        return JsBoolean.False;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.sort
    /// </summary>
    private JsValue Sort(JsValue thisObject, JsValue[] arguments)
    {
        /*
         * %TypedArray%.prototype.sort is a distinct function that, except as described below,
         * implements the same requirements as those of Array.prototype.sort as defined in 23.1.3.27.
         * The implementation of the %TypedArray%.prototype.sort specification may be optimized with the knowledge that the this value is
         * an object that has a fixed length and whose integer-indexed properties are not sparse.
         */

        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var buffer = o._viewedArrayBuffer;

        var compareFn = GetCompareFunction(arguments.At(0));

        if (len <= 1)
        {
            return o;
        }

        var array = SortArray(buffer, compareFn, o);

        for (var i = 0; i < (uint) array.Length; ++i)
        {
            o[i] = array[i];
        }

        return o;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.subarray
    /// </summary>
    private JsValue Subarray(JsValue thisObject, JsValue[] arguments)
    {
        var o = thisObject as JsTypedArray;
        if (o is null)
        {
            ExceptionHelper.ThrowTypeError(_realm);
        }

        var start = arguments.At(0);
        var end = arguments.At(1);

        var buffer = o._viewedArrayBuffer;
        var srcRecord = MakeTypedArrayWithBufferWitnessRecord(o, ArrayBufferOrder.SeqCst);

        uint srcLength = 0;
        if (!srcRecord.IsTypedArrayOutOfBounds)
        {
            srcLength = srcRecord.TypedArrayLength;
        }

        var relativeStart = TypeConverter.ToIntegerOrInfinity(start);

        double startIndex;
        if (double.IsNegativeInfinity(relativeStart))
        {
            startIndex = 0;
        }
        else if (relativeStart < 0)
        {
            startIndex = System.Math.Max(srcLength + relativeStart, 0);
        }
        else
        {
            startIndex = System.Math.Min(relativeStart, srcLength);
        }

        var elementSize = o._arrayElementType.GetElementSize();
        var srcByteOffset = o._byteOffset;
        var beginByteOffset = srcByteOffset + startIndex * elementSize;

        JsValue[] argumentsList;
        if (o._arrayLength == JsTypedArray.LengthAuto && end.IsUndefined())
        {
            argumentsList = [buffer, beginByteOffset];
        }
        else
        {
            double relativeEnd;
            if (end.IsUndefined())
            {
                relativeEnd = srcLength;
            }
            else
            {
                relativeEnd = TypeConverter.ToIntegerOrInfinity(end);
            }

            double endIndex;
            if (double.IsNegativeInfinity(relativeEnd))
            {
                endIndex = 0;
            }
            else if (relativeEnd < 0)
            {
                endIndex = System.Math.Max(srcLength + relativeEnd, 0);
            }
            else
            {
                endIndex = System.Math.Min(relativeEnd, srcLength);
            }

            var newLength = System.Math.Max(endIndex - startIndex, 0);
            argumentsList = [buffer, beginByteOffset, newLength];
        }

        return _realm.Intrinsics.TypedArray.TypedArraySpeciesCreate(o, argumentsList);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.tolocalestring
    /// </summary>
    private JsValue ToLocaleString(JsValue thisObject, JsValue[] arguments)
    {
        /*
         * %TypedArray%.prototype.toLocaleString is a distinct function that implements the same algorithm as Array.prototype.toLocaleString
         * as defined in 23.1.3.29 except that the this value's [[ArrayLength]] internal slot is accessed in place of performing
         * a [[Get]] of "length". The implementation of the algorithm may be optimized with the knowledge that the this value is an object
         * that has a fixed length and whose integer-indexed properties are not sparse. However, such optimization must not introduce
         * any observable changes in the specified behaviour of the algorithm.
         */

        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var array = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        const string separator = ",";
        if (len == 0)
        {
            return JsString.Empty;
        }

        JsValue r;
        if (!array.TryGetValue(0, out var firstElement) || firstElement.IsNull() || firstElement.IsUndefined())
        {
            r = JsString.Empty;
        }
        else
        {
            var elementObj = TypeConverter.ToObject(_realm, firstElement);
            var func = elementObj.Get("toLocaleString") as ICallable;
            if (func is null)
            {
                ExceptionHelper.ThrowTypeError(_realm);
            }

            r = func.Call(elementObj, Arguments.Empty);
        }

        for (var k = 1; k < len; k++)
        {
            var s = r + separator;
            var elementObj = TypeConverter.ToObject(_realm, array[k]);
            var func = elementObj.Get("toLocaleString") as ICallable;
            if (func is null)
            {
                ExceptionHelper.ThrowTypeError(_realm);
            }

            r = func.Call(elementObj, Arguments.Empty);

            r = s + r;
        }

        return r;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-%typedarray%.prototype.values
    /// </summary>
    private JsValue Values(JsValue thisObject, JsValue[] arguments)
    {
        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        return _realm.Intrinsics.ArrayIteratorPrototype.Construct(o, ArrayIteratorType.Value);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-get-%typedarray%.prototype-@@tostringtag
    /// </summary>
    private static JsValue ToStringTag(JsValue thisObject, JsValue[] arguments)
    {
        if (thisObject is not JsTypedArray o)
        {
            return Undefined;
        }

        return o._arrayElementType.GetTypedArrayName();
    }

    private JsValue ToReversed(JsValue thisObject, JsValue[] arguments)
    {
        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var a = TypedArrayCreateSameType(o, new [] { JsNumber.Create(len) });
        uint k = 0;
        while (k < len)
        {
            var from = len - k - 1;
            a[k++] = o.Get(from);
        }

        return a;
    }

    private JsValue ToSorted(JsValue thisObject, JsValue[] arguments)
    {
        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var compareFn = GetCompareFunction(arguments.At(0));

        var buffer = o._viewedArrayBuffer;

        var a = TypedArrayCreateSameType(o, new [] { JsNumber.Create(len) });

        var array = SortArray(buffer, compareFn, o);
        for (var i = 0; (uint) i < (uint) array.Length; ++i)
        {
            a[i] = array[i];
        }

        return a;
    }

    private ObjectInstance With(JsValue thisObject, JsValue[] arguments)
    {
        var taRecord = thisObject.ValidateTypedArray(_realm, ArrayBufferOrder.SeqCst);
        var o = taRecord.Object;
        var len = taRecord.TypedArrayLength;

        var value = arguments.At(1);

        var relativeIndex = TypeConverter.ToIntegerOrInfinity(arguments.At(0));

        long actualIndex;
        if (relativeIndex >= 0)
        {
            actualIndex = (long) relativeIndex;
        }
        else
        {
            actualIndex = (long) (len + relativeIndex);
        }

        value = o._contentType == TypedArrayContentType.BigInt
            ? TypeConverter.ToJsBigInt(value)
            : TypeConverter.ToJsNumber(value);

        if (!o.IsValidIntegerIndex(actualIndex))
        {
            ExceptionHelper.ThrowRangeError(_realm, "Invalid start index");
        }

        var a = TypedArrayCreateSameType(o, new [] { JsNumber.Create(len) });

        var k = 0;
        while (k < len)
        {
            a[k] = k == (int) actualIndex ? value : o.Get(k);
            k++;
        }

        return a;
    }

    private JsTypedArray TypedArrayCreateSameType(JsTypedArray exemplar, JsValue[] argumentList)
    {
        var constructor = exemplar._arrayElementType.GetConstructor(_realm.Intrinsics);
        var result = IntrinsicTypedArrayConstructor.TypedArrayCreate(_realm, constructor, argumentList);
        return result;
    }

    private ICallable? GetCompareFunction(JsValue compareArg)
    {
        ICallable? compareFn = null;
        if (!compareArg.IsUndefined())
        {
            if (compareArg is not ICallable callable)
            {
                ExceptionHelper.ThrowTypeError(_realm, "The comparison function must be either a function or undefined");
                return null;
            }
            compareFn = callable;
        }

        return compareFn;
    }

    private static JsValue[] SortArray(JsArrayBuffer buffer, ICallable? compareFn, JsTypedArray obj)
    {
        var comparer = TypedArrayComparer.WithFunction(buffer, compareFn);
        var operations = ArrayOperations.For(obj, forWrite: false);
        try
        {
            return operations.OrderBy(x => x, comparer).ToArray();
        }
        catch (InvalidOperationException e)
        {
            throw e.InnerException ?? e;
        }
    }

    private sealed class TypedArrayComparer : IComparer<JsValue>
    {
        public static TypedArrayComparer WithFunction(JsArrayBuffer buffer, ICallable? compare)
        {
            return new TypedArrayComparer(buffer, compare);
        }

        private readonly JsArrayBuffer _buffer;
        private readonly ICallable? _compare;
        private readonly JsValue[] _comparableArray = new JsValue[2];

        private TypedArrayComparer(JsArrayBuffer buffer, ICallable? compare)
        {
            _buffer = buffer;
            _compare = compare;
        }

        public int Compare(JsValue? x, JsValue? y)
        {
            if (x is null && y is null)
            {
                return 0;
            }

            if (x is not null && y is null)
            {
                return 1;
            }

            if (x is null)
            {
                return -1;
            }

            if (y is null)
            {
                return 1;
            }

            if (_compare is not null)
            {
                _comparableArray[0] = x;
                _comparableArray[1] = y;

                var v = TypeConverter.ToNumber(_compare.Call(Undefined, _comparableArray));

                if (double.IsNaN(v))
                {
                    return 0;
                }

                return (int) v;
            }

            if (x.Type == Types.BigInt || y.Type == Types.BigInt)
            {
                var xBigInt = TypeConverter.ToBigInt(x);
                var yBigInt = TypeConverter.ToBigInt(y);
                return xBigInt.CompareTo(yBigInt);
            }

            var xValue = x.AsNumber();
            var yValue = y.AsNumber();

            if (double.IsNaN(xValue) && double.IsNaN(yValue))
            {
                return 0;
            }

            if (double.IsNaN(xValue))
            {
                return 1;
            }

            if (double.IsNaN(yValue))
            {
                return -1;
            }

            if (xValue < yValue)
            {
                return -1;
            }

            if (xValue > yValue)
            {
                return 1;
            }

            if (NumberInstance.IsNegativeZero(xValue) && yValue == 0)
            {
                return -1;
            }

            if (xValue == 0 && NumberInstance.IsNegativeZero(yValue))
            {
                return 1;
            }

            return 0;
        }
    }
}