Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var arr = [1,2,3,4,5,6,7,8,9,0];
  };
</script>

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var idx = arr.indexOf(7);

var index = 0, length = arr.length;
while (index++ < length){
    if (arr[index] === 7){ break; }
}

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