Property Getter / Setter Techniques

JavaScript performance comparison

Revision 29 of this test case created by nobuoka

Preparation code

<script>
  var obj = {
    prop: 0
  };

  var obj1 = {
    _prop: 0,
    getProp: function() {
      return this._prop;
    },
    setProp: function(value) {
      this._prop = value;
    }
  };

  var obj2 = {
    _prop: 0,
    get prop() {
      return this._prop;
    },
    set prop(value) {
      this._prop = value;
    }
  };

  var obj3 = {
    _prop: 0
  }
  Object.defineProperty(obj3, "prop", {
    get: function() {
      return this._prop;
    },
    set: function(val) {
      this._prop = val;
    }
  });

  var obj4 = {
    _prop: 0
  }
  Object.defineProperties(obj4, {
    prop: {
      get: function() { return this._prop },
      set: function(val) { this._prop = val }
    }
  });

  var obj5 = {
    _prop: 0
  }
  Object.defineProperties(obj5, {
    prop: {
      get: function() { return this._prop },
      set: function(val) { this._prop = val }
    }
  });
  Object.seal(obj5);
</script>
    

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Methods
obj1.setProp(obj1.getProp() + 1);
pending…
get / set
obj2.prop = obj2.prop + 1;
pending…
Object.defineProperty
obj3.prop = obj3.prop + 1;
pending…
defineProperties
obj4.prop = obj4.prop + 1;
pending…
defineProperties (object is sealed)
obj5.prop = obj5.prop + 1;
pending…
Property
obj.prop = obj.prop + 1;
pending…

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Revisions

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