Run results for: ES6 property (get/set) & getter/setter function & direct access to object attribute

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.1

Device Platform: Mobile

Date tested: one year ago

ES6 property (set)

14.4M/s

Setter function

14.0M/s

Directly set

13.2M/s

Getter function

7.0M/s

ES6 property (get)

6.9M/s

Directly get

6.8M/s

View exact numbers

Test name	Executions per second
✓ ES6 property (set)	14,368,485 Ops/sec
Setter function	14,045,416 Ops/sec
Directly set	13,238,338 Ops/sec
Getter function	6,984,238 Ops/sec
ES6 property (get)	6,934,939 Ops/sec
Directly get	6,771,478 Ops/sec

Script Preparation code:

class Class {
    constructor () {
        this._val = 1
    }
    get value() { return this._val }
    set value(x) { this._val = x }
    getValue() { return this._val }
    setValue(x) { this.val = x }
}
var cls = new Class()
var wtf

Tests:

ES6 property (get)
wtf = cls.value
Getter function
wtf = cls.getValue()
Directly get
wtf = cls._val
ES6 property (set)
cls.value = 1
Setter function
cls.setValue(1)
Directly set
cls._val = 1