Info

Quickest way to get a byval copy of an array of simple values - will NOT copy immutable objects in arrays byval e.g. nested arrays / objects etc get copied BYREF.

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a = [1, 2, 3, 4, 5, 6, 7, 8, 9],
        b = null;
  };
</script>

Test runner

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Java applet disabled.

b = a.concat();

b = a.slice(0);

b = a.slice();

b = [].concat(a);

b = new Array(a.join());

var i = a.length,
    b = [];
for (;(i);) {
  --i;
  b.push(a[i]);
}

b = [];
Array.prototype.push.apply(b, a);

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by justageezer on 13th December 2012
• Revision 2: published on 14th January 2013
• Revision 3: published on 3rd March 2013

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