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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Write to data property

42.7M/s

Read from data property

42.2M/s

Read from accessor method

21.3M/s

Read from object literal property on prototype

21.1M/s

Read from object literal property

19.0M/s

Write to mutator method

17.9M/s

Write to object literal property on prototype

17.8M/s

Write to object literal property

11.1M/s

View exact numbers

Test name	Executions per second
✓ Write to data property	42,700,396 Ops/sec
Read from data property	42,243,604 Ops/sec
Read from accessor method	21,343,948 Ops/sec
Read from object literal property on prototype	21,071,366 Ops/sec
Read from object literal property	19,014,936 Ops/sec
Write to mutator method	17,862,956 Ops/sec
Write to object literal property on prototype	17,792,064 Ops/sec
Write to object literal property	11,115,429 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;