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/84.0.4147.135 Safari/537.36

Browser: Chrome 84

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Read from data property	11944928.0 Ops/sec
Write to data property	11895602.0 Ops/sec
Read from accessor method	5966777.0 Ops/sec
Write to mutator method	4444305.5 Ops/sec
Read from object literal property	5369902.0 Ops/sec
Write to object literal property	2665076.2 Ops/sec
Read from object literal property on prototype	5375312.0 Ops/sec
Write to object literal property on prototype	4341736.0 Ops/sec
Write to object	5721419.5 Ops/sec
Read to object	4266714.5 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