Run results for: Data Properties vs. Accessor Properties vs. Getter / Setter Methods 1

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/85.0.4183.83 Safari/537.36

Browser: Chrome 85

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Read from data property	13553078.0 Ops/sec
Write to data property	13450910.0 Ops/sec
Read from accessor method	6455593.0 Ops/sec
Write to mutator method	5209807.5 Ops/sec
Read from object literal property	6332278.5 Ops/sec
Write to object literal property	3128771.5 Ops/sec
Read from object literal property on prototype	6387415.0 Ops/sec
Write to object literal property on prototype	5257249.5 Ops/sec
Write to object	6502517.0 Ops/sec
Read to object	5219394.5 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 = {
  getProperty() {
    return property;
  },
  setProperty(value) {
    property = value;
  },
  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;
Write to object
var value = prototypeAccessor.getProperty();
Read to object
prototypeAccessor.setProperty(true);

Run results for: Data Properties vs. Accessor Properties vs. Getter / Setter Methods 1

The purpose of this benchmark is to determine the performance differences between data properties, accessor properties and getters / setter functions.

Read from data property

Write to data property

Read from accessor method

Write to mutator method

Read from object literal property

Write to object literal property

Read from object literal property on prototype

Write to object literal property on prototype

Write to object

Read to object