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 (iPhone; CPU iPhone OS 17_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.4.1

Device Platform: Mobile

Date tested: 2 years ago

Write to data property

29.2M/s

Read from data property

28.8M/s

Read from accessor method

17.5M/s

Read from object literal property on prototype

17.1M/s

Read from object literal property

17.0M/s

Write to mutator method

14.3M/s

Write to object literal property on prototype

14.0M/s

Write to object literal property

13.9M/s

View exact numbers

Test name	Executions per second
✓ Write to data property	29,249,536 Ops/sec
Read from data property	28,814,406 Ops/sec
Read from accessor method	17,523,364 Ops/sec
Read from object literal property on prototype	17,050,800 Ops/sec
Read from object literal property	17,037,174 Ops/sec
Write to mutator method	14,257,870 Ops/sec
Write to object literal property on prototype	14,029,181 Ops/sec
Write to object literal property	13,937,561 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;