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 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Read from data property

14.6M/s

Write to data property

14.5M/s

Read from object literal property on prototype

8.2M/s

Read from accessor method

7.9M/s

Read from object literal property

7.8M/s

Write to object literal property

6.7M/s

Write to object literal property on prototype

6.7M/s

Write to mutator method

6.6M/s

View exact numbers

Test name	Executions per second
✓ Read from data property	14,609,513 Ops/sec
Write to data property	14,499,140 Ops/sec
Read from object literal property on prototype	8,234,050 Ops/sec
Read from accessor method	7,940,791 Ops/sec
Read from object literal property	7,838,866 Ops/sec
Write to object literal property	6,690,902 Ops/sec
Write to object literal property on prototype	6,656,980 Ops/sec
Write to mutator method	6,612,618 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;