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_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/125.0.6422.80 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 125

Operating system: iOS 17.5

Device Platform: Mobile

Date tested: 2 years ago

Read from data property

37.1M/s

Write to data property

36.5M/s

Read from accessor method

20.8M/s

Read from object literal property

20.2M/s

Read from object literal property on prototype

20.1M/s

Write to mutator method

17.0M/s

Write to object literal property

16.8M/s

Write to object literal property on prototype

16.8M/s

View exact numbers

Test name	Executions per second
✓ Read from data property	37,117,832 Ops/sec
Write to data property	36,472,328 Ops/sec
Read from accessor method	20,811,220 Ops/sec
Read from object literal property	20,152,292 Ops/sec
Read from object literal property on prototype	20,131,374 Ops/sec
Write to mutator method	17,046,440 Ops/sec
Write to object literal property	16,782,408 Ops/sec
Write to object literal property on prototype	16,767,274 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;