Info

A test case to see if concatenating an array instead of a string for an inflate library would perform better, based on this post: http://my.opera.com/emoller/blog/2011/05/01/javascript-performance

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var precompiled = 'apple';
    while (precompiled.length < 100) {
      var offs = precompiled.length - 5;
      for (var i = offs; i < offs + 10; ++i) {
        // calling charAt(i) on `precompiled` will
        // flatten the string in most engines
        precompiled += precompiled.charAt(i);
      }
    }
    Array.prototype.fjoin=function(d){for(var a=0,c=this.length,b="";a<c;a++)b+=a<c-1?this[a]+d:this[a];return b};
    
  };
</script>

Test runner

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Java applet disabled.

var dest = 'apple';
while (dest.length < 100) {
  var offs = dest.length - 5;
  for (var i = offs; i < offs + 10; i++) {
    dest += dest.charAt(i);
  }
}

var dest = 'apple';
while (dest.length < 100) {
  var offs = dest.length - 5;
  for (var i = offs; i < offs + 10; i++) {
    dest += precompiled.charAt(i);
  }
}

var dest = ['a', 'p', 'p', 'l', 'e'];
while (dest.length < 100) {
  var offs = dest.length - 5;
  for (var i = offs; i < offs + 10; i++) {
    dest[dest.length] = dest[i];
  }
}
dest = dest.fjoin('');

var dest = ['a', 'p', 'p', 'l', 'e'];
while (dest.length < 100) {
  var offs = dest.length - 5;
  for (var i = offs; i < offs + 10; i++) {
    dest[dest.length] = dest[i];
  }
}
dest = dest.join('');

Compare results of other browsers

Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by Corey Schram on 9th May 2011
• Revision 2: published on 30th October 2012 and last updated on 6th December 2012
• Revision 9: published on 25th January 2013
• Revision 10: published on 28th October 2013
• Revision 11: published on 11th November 2013
• Revision 12: published on 17th April 2014
• Revision 13: published on 29th April 2014
• Revision 14: published on 28th August 2014
• Revision 15: published on 5th February 2015
• Revision 16: published by greg on 15th February 2015
• Revision 17: published on 10th April 2015
• Revision 18: published on 20th April 2015

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