Emptying an array

JavaScript performance comparison

Revision 25 of this test case created by

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var arr = [],
    narr;
  if (window.narr) {
    narr = window.narr
  } else {
    narr = [];
    for (var i = 0, len = 25 * 1024 * 1024; i < len; i++) // runs 25 to 100 times = some mb
    {
      narr.push('a' + i);
    }
  }
  arr = narr.slice();

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Setting .length to 0
arr.length = 0;

// setTimeout(function() {}, 1); // give the GC some time to kick in
pending…
Creating a new empty array
arr = [];

// setTimeout(function() {}, 1); // give the GC some time to kick in
pending…
Splice
arr.splice(0, arr.length);

// setTimeout(function() {}, 1); // give the GC some time to kick in
pending…

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Revisions

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