three.js/test/benchmark/core/Vector3Length.js

( function () {

	var THREE = {};

	THREE.Vector3 = function ( x, y, z ) {

		this.x = x || 0;
		this.y = y || 0;
		this.z = z || 0;

	};

	THREE.Vector3.prototype = {
		constructor: THREE.Vector3,
		lengthSq: function () {

			return this.x * this.x + this.y * this.y + this.z * this.z;

		},

		length: function () {

			return Math.sqrt( this.lengthSq() );

		},

		length2: function () {

			return Math.sqrt( this.x * this.x + this.y * this.y + this.z * this.z );

		}

	};

	var a = [];
	for ( var i = 0; i < 100000; i ++ ) {

		a[ i ] = new THREE.Vector3( i * 0.01, i * 2, i * - 1.3 );

	}


	var suite = Bench.newSuite( 'Vector 3 Length' );

	suite.add( 'NoCallTest', function () {

		var result = 0;
		for ( var i = 0; i < 100000; i ++ ) {

			var v = a[ i ];
			result += Math.sqrt( v.x * v.x + v.y * v.y + v.z * v.z );

		}

		return result;

	} );

	suite.add( 'InlineCallTest', function () {

		var result = 0;
		for ( var i = 0; i < 100000; i ++ ) {

			result += a[ i ].length2();

		}

		return result;

	} );

	suite.add( 'FunctionCallTest', function () {

		var result = 0;
		for ( var i = 0; i < 100000; i ++ ) {

			result += a[ i ].length();

		}

		return result;

	} );

} )();