Primitive value string vs Wrapper Object String - length

JavaScript performance comparison

Test case created

Preparation code

str1.length = <div id="id1"></div><br>
str2.length = <div id="id2"></div>
 
<script>
Benchmark.prototype.setup = function() {
    var str1 = "Hello";
    var str2 = new String("Hello");
   
    var i = "(idle)",
        k = "(idle)";
   
};

Benchmark.prototype.teardown = function() {
    var x = document.getElementById("id1"); x.innerHTML = i;
    var y = document.getElementById("id2"); y.innerHTML = k;
};
</script>

Preparation code output

str1.length =

str2.length =

Test runner

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Testing in unknown unknown
Test Ops/sec
Primitive value string str1.length
i = str1.length;
pending…
Wrapper object string str2.length
k = str2.length;
pending…

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