Preparation code

var test = {
   abc : ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z']
}
<script>
  Benchmark.prototype.setup = function() {
    var count = test.abc.length;
    var letters = test.abc;
    var letter;
  };
</script>

Preparation code output

Test runner

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for(var i = 0; i < count; i++){
    letter = test.abc[i];
}

for(var i = 0; i < count; i++){
    letter = letters[i];
}

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