prealloc vs no prealloc

JavaScript performance comparison

Revision 2 of this test case created

Preparation code

<script>
function FooPrealloc() {
  this.data = null;
}
FooPrealloc.prototype.foo = function () {
  this.data = 'hello world';
};

function FooNoPrealloc() {
}
FooNoPrealloc.prototype.foo = function () {
  this.data = 'hello world';
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
prealloc
var foo = new FooPrealloc();
foo.foo();
pending…
no prealloc
var foo = new FooNoPrealloc();
foo.foo();
pending…

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