Unshift item inside an array

JavaScript performance comparison

Test case created by joel

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var arr = [1, 2, 3, 4, 5, 6, 7];
  
  function fn_unshift() {
    arr.unshift(0);
    return arr;
  }
  
  function fn_concat_init() {
    return [0].concat(arr)
  }

};
</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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