preallocating Array (v8)

Revision 8 of this benchmark created on

Preparation HTML

<script>
  var N = 100;
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
new Array
var a = [];
for (var i = 0; i < N; ++i) {
 a.push("foo");
}
ready
new Array(N) and length
var a = new Array(N);
a.length = 0;
for (var i = 0; i < N; ++i) {
 a.push("foo");
}
ready
new Array(N) and fill without shortening
var a = new Array(N);
for (var i = 0; i < N; ++i) {
 a[i] = "foo";
}
ready
new Array(N) and push adapter
var b = new Array(N);
a = {
 i: 0,
 push: function(x) {
  b[this.i++] = x;
 }
};
for (var i = 0; i < N; ++i) {
 a.push("foo");
}
ready

Revisions

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