Primitive value string vs Wrapper Object String - length

JavaScript performance comparison

Test case created by

Preparation code

str1.length = <div id="id1"></div><br>
str2.length = <div id="id2"></div>

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;


Preparation code output

str1.length = <div id="id1"></div><br> str2.length = <div id="id2"></div>

Test runner

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Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Primitive value string str1.length
i = str1.length;
Wrapper object string str2.length
k = str2.length;

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str1.length =

str2.length =