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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36

Browser: Chrome 139

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Write to mutator method

159.9M/s

Write to object literal property on prototype

156.9M/s

Read from data property

156.6M/s

Write to data property

155.4M/s

Read from object literal property on prototype

149.8M/s

Read from accessor method

147.5M/s

Read from object literal property

68.9M/s

Write to object literal property

15.8M/s

View exact numbers

Test name	Executions per second
✓ Write to mutator method	159,907,376 Ops/sec
Write to object literal property on prototype	156,852,832 Ops/sec
Read from data property	156,648,128 Ops/sec
Write to data property	155,438,304 Ops/sec
Read from object literal property on prototype	149,835,056 Ops/sec
Read from accessor method	147,499,632 Ops/sec
Read from object literal property	68,882,144 Ops/sec
Write to object literal property	15,778,001 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;