Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var names = ['zero','one','two','three','four','five','six','seven','eight','nine'];
    
    var digitNameGlobalVariable = function(n){
     return names[n];
    }
    
    var digitNamesPrivateVariable = function(n){
    var _names = ['zero','one','two','three','four','five','six','seven','eight','nine'];
    return _names[n];
    }
    
    var digitNamesClosure = (function(n){
    var _names = ['zero','one','two','three','four','five','six','seven','eight','nine'];
    return function(n){ return _names[n] };
    }());
  };
</script>

Test runner

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digitNameGlobalVariable(3);

digitNamesPrivateVariable(3);

digitNamesClosure(3);

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