mixin fun

JavaScript performance comparison

Revision 25 of this test case created by Ash Heskes

Preparation code

<script>
  //1
  var circleFns = {
   area: function() {
    return Math.PI * this.radius * this.radius;
   },
   grow: function() {
    this.radius++;
   },
   shrink: function() {
    this.radius--;
   }
  }
  
  //2
  var asCircle = function() {
   this.area = function() {
    return Math.PI * this.radius * this.radius;
   };
   this.grow = function() {
    this.radius++;
   };
   this.shrink = function() {
    this.radius--;
   };
  }
  
  //3
  var asCircleCached = (function() {
   var area = function() {
    return Math.PI * this.radius * this.radius;
   };
   var grow = function() {
    this.radius++;
   };
   var shrink = function() {
    this.radius--;
   };
   return function() {
    this.area = area, this.grow = grow, this.shrink = shrink;
   }
  })();
  
  //4
  var arr = Array.prototype;
  Function.prototype.curry = function() {
   var fn = this;
   var args = arr.slice.call(arguments, 0);
   return function() {
    return fn.apply(this, args.concat(arr.slice.call(arguments, 0)));
   }
  }
  
  //4
  var asCircleCachedAndCurried = (function() {
   var area = function() {
    return Math.PI * this.radius * this.radius;
   };
   var grow = function(growBy) {
    this.radius += growBy;
   };
   var shrink = function(shrinkBy) {
    this.radius -= shrinkBy;
   };
   return function(options) {
    this.area = area, this.grow = grow.curry(options['growBy']), this.shrink = shrink.curry(options['shrinkBy'])
   }
  })();
  
  //5
  var asCircleWithOptions = function(options) {
   this.area = function() {
    return Math.PI * this.radius * this.radius;
   };
   this.grow = function() {
    this.radius += options.growBy;
   };
   this.shrink = function() {
    this.radius -= options.shrinkBy;
   };
  }
  
  //set up test constructor
  var CircularObject = function(radius) {
   this.radius = radius
  };
</script>

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Testing in unknown unknown
Test Ops/sec
old style
 
for (var k in circleFns) {
 if (circleFns.hasOwnProperty(k)) {
  CircularObject.prototype[k] = circleFns[k]
 };
}
var obj = new CircularObject(4);
obj.shrink();
 pending…
new style
 
asCircle.call(CircularObject.prototype);
var obj = new CircularObject(4);
obj.shrink();
 pending…
new style w/ caching
 
asCircleCached.call(CircularObject.prototype);
var obj = new CircularObject(4);
obj.shrink();
 pending…
new style w/caching and options
 
asCircleCachedAndCurried.call(
CircularObject.prototype, {
 growBy: 2,
 shrinkBy: 2
});
var obj = new CircularObject(4);
obj.shrink();
 pending…
new style uncached w/options
 
asCircleWithOptions.call(
CircularObject.prototype, {
 growBy: 2,
 shrinkBy: 2
});
var obj = new CircularObject(4);
obj.shrink();
 pending…

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