function calls: direct vs apply vs call vs bind

JavaScript performance comparison

Revision 15 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var f = function() {
        return this;
        };
   
    var that = {
      f: f
    };
   
   
   
    var wrappedCall = function() {
        f.call(that);
        };
    var slice = Array.prototype.slice;
    Function.prototype.bind2 = function(_this) {
      var _self = this;
      var args = slice.call(arguments, 1);
      if (args.length === 0) {
        return function() {
          if (arguments.length === 0) return _self.call(_this);
          else if (arguments.length > 0) return _self.apply(_this, args);
        }
      }
   
      return function() {
        if (arguments.length === 0) return _self.apply(_this, args);
   
        var a2 = args.contact(slice.call(arguments));
        return _self.apply(_this, a2);
      }
    }
   
    var bound2 = f.bind2(that);
   
    var name = 'f';
};
</script>

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Testing in unknown unknown
Test Ops/sec
direct
that.f();
pending…
apply
f.apply(that);
pending…
call
f.call(that);
pending…
bind
bound();
pending…
bind2
bound2();
pending…
by string
that['f']();
pending…
by string (indirect)
that[name]();
pending…
direct (local)
f();
pending…
Wrapped Call
wrappedCall()
pending…
call by string
that['f'].call(that);
pending…

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1 comment

www commented :

what is this????

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