Info

See setup for tests, this looks at the speed different between taking a reference to the current this context verses using function.bind

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function TestObj () {
      this.array = [];
      for (var i = 0; i < 2000; i++)
        this.array.push(i);
    }
    TestObj.prototype.test_self = function () {
      var self = this;
      this.array.forEach(function (val, index) {
        self.array[index] = val * 2;
      });
    }
    TestObj.prototype.test_bind = function () {
      this.array.forEach(function (val, index) {
        this.array[index] = val * 2;
      }.bind(this));
    }
    var test_obj = new TestObj;
  };
</script>

Test runner

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test_obj.test_self()

test_obj.test_bind()

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