generator-vs-array

JavaScript performance comparison

Revision 2 of this test case created by Wraithan

Info

trying simple and probably unfair performance comparison between generators and just arrays

Preparation code

<script type="application/javascript;version=1.7">
var arr = Array(100).join(Math.random()).split('.');
function generator() {
  for(var
    i = 0; i < this.length;
    yield this[i++]
  );
}
function forLoop() {
  for(var
    out = [],
    i = 0; i < this.length;
    out.push(this[i++])
  );
  return out;
}
function forEach(value, key, original) {
  this.push(value);
}
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
generator
var iterable = generator.call(arr),
    values = [],
    value;
while (!(value = iterable.next()).done) {
  values.push(value.value);
}
pending…
for loop
var values = forLoop.call(arr);
pending…
forEach
var values = [];
arr.forEach(forEach, values);
pending…

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