Run results for: ES6 property (get/set) & getter/setter function vs direct access to object attribute (private and not)

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_6_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.6 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.6.2

Device Platform: Mobile

Date tested: 8 months ago

Public ES6 property (get)

492.4M/s

Public Getter function

457.4M/s

Public Directly get

440.0M/s

Private Getter function

437.4M/s

Public ES6 property (set)

409.7M/s

Private Setter function

404.4M/s

Private ES6 property (set)

393.0M/s

Private ES6 property (get)

347.7M/s

Public Setter function

266.7M/s

Public Directly set

264.2M/s

View exact numbers

Test name	Executions per second
✓ Public ES6 property (get)	492,417,024 Ops/sec
Public Getter function	457,440,608 Ops/sec
Public Directly get	439,977,152 Ops/sec
Private Getter function	437,433,824 Ops/sec
Public ES6 property (set)	409,728,416 Ops/sec
Private Setter function	404,419,936 Ops/sec
Private ES6 property (set)	393,028,672 Ops/sec
Private ES6 property (get)	347,661,888 Ops/sec
Public Setter function	266,689,936 Ops/sec
Public Directly set	264,156,992 Ops/sec

Script Preparation code:

class Private {
    #value = 0;
    constructor() {
        this.#value = 1
    }
    get value() {
        return this.#value
    }
    set value(x) {
        this.#value = x
    }
    getValue() {
        return this.#value
    }
    setValue(x) {
        this.#value = x
    }
}
class Public {
    value = 0;
    constructor() {
        this.value = 1
    }
    get value() {
        return this.value
    }
    set value(x) {
        this.value = x
    }
    getValue() {
        return this.value
    }
    setValue(x) {
        this.value = x
    }
}
var private = new Private();
var public = new Public();
var val = 0;

Tests:

Public ES6 property (get)
val = public.value;
Public Getter function
val = public.getValue();
Public Directly get
val = public.value;
Public ES6 property (set)
public.value = 1;
Public Setter function
public.setValue(1);
Public Directly set
public.value = 1;
Private ES6 property (get)
val = private.value;
Private Getter function
val = private.getValue();
Private ES6 property (set)
private.value = 1;
Private Setter function
private.setValue(1);