Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a = [{test: true}, 3, "dkfjdl", [3,4,5]];
    
    function deepCopy(obj) {
        if (Object.prototype.toString.call(obj) === '[object Array]') {
            var out = [], i = 0, len = obj.length;
            for ( ; i < len; i++ ) {
                out[i] = arguments.callee(obj[i]);
            }
            return out;
        }
        if (typeof obj === 'object') {
            var out = {}, i;
            for ( i in obj ) {
                out[i] = arguments.callee(obj[i]);
            }
            return out;
        }
        return obj;
    }
  };
</script>

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deepCopy(a);

JSON.parse(JSON.stringify(a));

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