Unshift item inside an array

JavaScript performance comparison

Revision 9 of this test case created by mvedie

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var arr_for_unshift = [];
  for (var i = 0; i < 10000; i++)
    arr_for_unshift.push(Math.random());
  var arr_for_concat = arr_for_unshift.slice(0);
  
  function fn_unshift() {
    arr_for_unshift.unshift(0);
    return arr_for_unshift;
  }
  
  function fn_concat_init() {
    arr_for_concat = [0].concat(arr_for_concat);
    return arr_for_concat;
  }

};
</script>

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Add element at the init of Array with unshift()
fn_unshift()
pending…
Add element at the init of Array with concat()
fn_concat_init()
pending…

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