Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var text = 'Hello, my name is {0} {0} {1}!',
        result;
    
    String.prototype.format = function () {
      var string = this;
    
      for (var i = 0; i < arguments.length; i++) {
        string = string.replace(new RegExp('\\{' + i + '\\}', 'gm'), arguments[i]);
      }
    
      return string;
    };
    
    String.prototype.format2 = function () {
      var string = this,
          i = 0,
          args = arguments.length;
    
      for (; i < args; i++) {
        string = string.replace(new RegExp('\\{' + i + '\\}', 'gm'), arguments[i]);
      }
    
      return string;
    };
    
    String.prototype.format3 = function () {
      var string = this,
          args = arguments.length;
    
      while (args--) {
        string = string.replace(new RegExp('\\{' + args + '\\}', 'gm'), arguments[args]);
      }
    
      return string;
    };
  };
</script>

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

result = text.format('John', 'Mayer');

result = text.format2('John', 'Mayer');

result = text.format3('John', 'Mayer');

You can edit these tests or add even more tests to this page by appending /edit to the URL.

Compare results of other browsers

0 comments