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.

Go to the benchmark

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0

Browser: Firefox 121

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
✓ Read from object literal property on prototype	617,280,896 Ops/sec
Read from accessor method	583,148,992 Ops/sec
Read from data property	519,358,944 Ops/sec
Read from object literal property	498,392,192 Ops/sec
Write to data property	392,875,488 Ops/sec
Write to object literal property on prototype	350,105,440 Ops/sec
Write to object literal property	343,819,776 Ops/sec
Write to mutator method	327,548,768 Ops/sec

Test name

Executions per second

✓ Read from object literal property on prototype

617,280,896 Ops/sec

Read from accessor method

583,148,992 Ops/sec

Read from data property

519,358,944 Ops/sec

Read from object literal property

498,392,192 Ops/sec

Write to data property

392,875,488 Ops/sec

Write to object literal property on prototype

350,105,440 Ops/sec

Write to object literal property

343,819,776 Ops/sec

Write to mutator method

327,548,768 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;