Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var text = 'hello this is my name oh yeah',
    result;
    
    String.prototype.truncate = String.prototype.truncate || function (length, substitute, fullwords) {
      return this.length > (length || 30) ? this.substr(0, (length || 30)).replace(/\s$/, '') + (substitute || '…') : this.toString();
    };
    
    String.prototype.truncate2 = String.prototype.truncate || function (length, substitute, fullwords) {
      var length = length || 30;
    
      return this.length > length ? this.substr(0, length).replace(/\s$/, '') + (substitute || '…') : this.toString();
    };
  };
</script>

Test runner

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result = text.truncate();

result = text.truncate2();

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