array join vs string connect

JavaScript performance comparison

Revision 24 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    Array.prototype.myJoin = function (del) {
      var str = this[0] || ''; // very lazy check
      for (var i=1; i<this.length; i++) {
        str = str + this[i];
      }
      return (str);
    }
   
    var arr = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];
   
};
</script>

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Testing in unknown unknown
Test Ops/sec
array join
var str = arr.myJoin('');
 
pending…
string concatenate
var str = arr.join('');
 
pending…

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