Property Getter / Setter Techniques

JavaScript performance comparison

Revision 11 of this test case created by Stéphan Kochen

Preparation code

<script>
  var global = this;
  
  (function() {
    global.obj = {
      prop: 0
    };
  
    global.obj1 = {
      _prop: 0,
      getProp: function() {
        return this._prop;
      },
      setProp: function(value) {
        this._prop = value;
      }
    };
  
    global.obj2 = {
      _prop: 0,
      get prop() {
        return this._prop;
      },
      set prop(value) {
        this._prop = value;
      }
    };
  
  
    global.obj3 = {
      _prop: 0
    }
  
  
    Object.defineProperty(global.obj3, "prop", {
      get: function() {
        return this._prop;
  
      },
      set: function(val) {
        this._prop = val;
      }
    });
  
    global.obj4 = {
      _prop: 0
    }
  
  
    global.obj4.__defineGetter__("prop", function() {
      return this._prop;
    });
  
    global.obj4.__defineSetter__("prop", function(val) {
      this._prop = val;
    });
  
  
    global.obj5 = {
      _prop: 0,
      prop: function(value) {
        if (arguments.length)
          this._prop = value
        else
          return this._prop;
      }
    };
  
  
    global.obj6 = {
      attributes: {
        prop: 0
      },
      get: function(name) {
        return this.attributes[name];
      },
      set: function(name, value) {
        this.attributes[name] = value;
      }
    };
  })();
</script>
    

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Getter / setter methods
global.obj1.setProp(global.obj1.getProp() + 1);
pending…
get / set syntax
global.obj2.prop = global.obj2.prop + 1;
pending…
Object.defineProperty
global.obj3.prop = global.obj3.prop + 1;
pending…
__defineGetter__
global.obj4.prop = global.obj4.prop + 1;
pending…
Regular property
global.obj.prop = global.obj.prop + 1;
pending…
Combined getter / setter method
global.obj5.prop(global.obj5.prop() + 1);
pending…
Generic get/set methods
global.obj6.set('prop', global.obj6.get('prop') + 1);
pending…

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Revisions

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1 Comment

Stéphan Kochen (revision owner) commented :

Added generic get/set methods, as used by e.g. Backbone.js.