Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    case = ['radiohead', 'jeff', 'sigur ros', 'hammock', 'eluvium', 'mono', 'mogwai', 'olafur', 'hello destiny', 'cool things', 'between the buried and me', 'this will destroy you'];
  };
</script>

Test runner

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for(var i = case.length; i--;){

}

var cache = case.length
for(var i = cache; i--;){

}

var cache = case.length
for(var cache; cache--;){

}

for(var i = case.length; i-- > 0;){

}

var cache = case.length
for(var i = cache; i-- > 0;){

}

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