export function removeMatching(array, testFunc) {
  let removeCnt = 0
  let i = 0

  while (i < array.length) {
    if (testFunc(array[i])) { // truthy value means *remove*
      array.splice(i, 1)
      removeCnt++
    } else {
      i++
    }
  }

  return removeCnt
}


export function removeExact(array, exactVal) {
  let removeCnt = 0
  let i = 0

  while (i < array.length) {
    if (array[i] === exactVal) {
      array.splice(i, 1)
      removeCnt++
    } else {
      i++
    }
  }

  return removeCnt
}


export function isArraysEqual(a0, a1) {
  let len = a0.length
  let i

  if (len == null || len !== a1.length) { // not array? or not same length?
    return false
  }

  for (i = 0; i < len; i++) {
    if (a0[i] !== a1[i]) {
      return false
    }
  }

  return true
}