Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var count = 10;
    var x = 0;
    function valfunc() {
    return x = x+5;
    }
    var a = [];
  };
</script>

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while(count--) {
a.push(valfunc());
}

while(count--) {
a[a.length] = valfunc();
}

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