Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var method = function (foo) {
        this.foo = foo;
        return this;
    };
    
    function genericsize (method) {
    
    var source = method.toString().match(/^function\s?(?:[^( ]+\s)?\(([^)]*)\)\s?\{((?:.|\n)*)\}$/),
    
    parts = source[1].split(/\s*,\s*/),
    
    body = source[2].replace(/(^|\W)this(\W|$)/g, "$1that$2");
    
    parts.unshift("that");
    
    parts.push(body);
    
     
    
    return Function.apply(null, parts);
    
    }
    var slice = Array.prototype.slice;
    var wrapFunc = function (that) {
        return method.apply(that, slice.call(arguments, 1));
    };
    
    var newFunc = genericsize(method);
    
    var that = {},
        bar = "bar";
    
    
  };

  Benchmark.prototype.teardown = function() {
    var that = {};
  };
</script>

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wrapFunc(that, bar);

newFunc(that, bar);

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