Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function zeroFill(len) {
      var zero = [];
      while (--len) {
        zero.push(0);
      }
      return zero;
    }
    
    function zeroFill2(len) {
      var zero = new Array(len);
      while (--len) {
        zero[len] = 0;
      }
      return zero;
    }
  };
</script>

Test runner

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zeroFill(100);

zeroFill2(100);

zeroFill(10000);

zeroFill2(10000);

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