bind vs emulate

JavaScript performance comparison

Revision 15 of this test case created

Preparation code

<div></div>
<script>
var emulatebind = function (f, context) {
  var curriedArgs = Array.prototype.slice.call(arguments, 2);
  return function () {
    var allArgs = curriedArgs.slice(0);
    for (var i = 0, n = arguments.length; i < n; ++i) {
      allArgs.push(arguments[i]);
    }
    return f.apply(context, allArgs);
  };
};

var i = { i: 0 };

var f = function (n) {
  this.i += n;
  return Math.sqrt(this.i);
};

function bind(fn, ctx) {
  return function() {
    return fn.apply(ctx, arguments);
  };
}


</script>
<script>
Benchmark.prototype.setup = function() {
    var binded = f.bind(i);
    var emulated = emulatebind(f, i);
    var simple = bind(f, i);
    var self = function(n) {
      i.i += n;
      return Math.sqrt(i.i);
    }
};

Benchmark.prototype.teardown = function() {
    i.i = 0;
};
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
bind
binded(Math.random());
pending…
emulate
emulated(Math.random());
pending…
simple
simple(Math.random());
pending…
self
self(Math.random());
pending…

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