Cost of spreading an array

JavaScript performance comparison

Test case created by T.J. Crowder

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  function foo(array) {
      let sum = 0;
      for (const e of array) {
          sum += e;
      }
      return sum;
  }
  var a = [1, 2, 3, 4, 5];

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Spread
if (foo([...a, 10]) !== 25) throw new Error("Error in test");
pending…
No spread
if (foo(a) + 10 !== 25) throw new Error("Error in test");
pending…

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