Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a = [], i = 0;
    for (; i < 1000; i++)
        a[i] = Math.floor(Math.random() * 10);
  };
</script>

Test runner

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var b = a.slice();
for (var i = b.length; i--;)
    if (b === 5) b.splice(i, 1);

var b = a.slice();
for (var i = 0, j = 0, l = b.length; i < l; i++)
    if (b !== 5) b[j++] = b[i];
b.length = j;

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