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>

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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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