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/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Write to data property

95.5M/s

Read from accessor method

92.4M/s

Read from data property

91.5M/s

Read from object literal property on prototype

89.8M/s

Write to object literal property on prototype

85.5M/s

Write to mutator method

83.2M/s

Read from object literal property

45.5M/s

Write to object literal property

12.2M/s

View exact numbers

Test name	Executions per second
✓ Write to data property	95,537,256 Ops/sec
Read from accessor method	92,405,456 Ops/sec
Read from data property	91,515,264 Ops/sec
Read from object literal property on prototype	89,775,600 Ops/sec
Write to object literal property on prototype	85,498,296 Ops/sec
Write to mutator method	83,152,160 Ops/sec
Read from object literal property	45,477,888 Ops/sec
Write to object literal property	12,207,531 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;