Run results for: Data Properties vs. Accessor Properties vs. Getter / Setter Methods

The purpose of this benchmark is to determine the performance differences between data properties, accessor properties and getters / setter functions.

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; SM-G975F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.116 Mobile Safari/537.36 EdgA/46.06.4.5161

Browser: Chrome Mobile 77

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
Read from data property	10790329.0 Ops/sec
Write to data property	10925721.0 Ops/sec
Read from accessor method	5309670.0 Ops/sec
Write to mutator method	4157820.2 Ops/sec
Read from object literal property	4389117.0 Ops/sec
Write to object literal property	2244888.5 Ops/sec
Read from object literal property on prototype	4520462.5 Ops/sec
Write to object literal property on prototype	3527368.0 Ops/sec

Script Preparation code:

var data = {
  property: property
};

var property = undefined;

var method = {
  getProperty: function() {
    return property;
  },

  setProperty: function(value) {
    property = value;
  }
};

var objectLiteralAccessor = {
  get property() {
    return property;
  },
  set property(value) {
    property = value;
  }
};

function Class() {
}

Class.prototype = {
  get property() {
    return property;
  },
  set property(value) {
    property = value;
  }
};
    
var prototypeAccessor = new Class();

Tests:

Read from data property
var value = data.property;
Write to data property
data.property = true;
Read from accessor method
var value = method.getProperty();
Write to mutator method
method.setProperty(true);
Read from object literal property
var value = objectLiteralAccessor.property;
Write to object literal property
objectLiteralAccessor.property = true;
Read from object literal property on prototype
var value = prototypeAccessor.property;
Write to object literal property on prototype
prototypeAccessor.property = true;

Run results for: Data Properties vs. Accessor Properties vs. Getter / Setter Methods

The purpose of this benchmark is to determine the performance differences between data properties, accessor properties and getters / setter functions.

Read from data property

Write to data property

Read from accessor method

Write to mutator method

Read from object literal property

Write to object literal property

Read from object literal property on prototype

Write to object literal property on prototype