Run results for: weakmap vs closure

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.75 Safari/537.36

Browser: Chrome 73

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
closure get	14974797.0 Ops/sec
weakmap get	6575907.0 Ops/sec
closure incr	15423466.0 Ops/sec
weakmap incr	4132445.0 Ops/sec

Script Preparation code:

function A() {
	var x = 0;
	return {
		incr() { x ++ },
		get() { return x },
	}
}
var closure = A();
closure.incr()

var wm = new WeakMap();
function B() {
	var x = {
		incr() { wm.set(x, (wm.get(x) || 1)+1) },
		get() { return wm.get(x) },
	}
	return x
}
var weakmap = B();
weakmap.incr()

Tests:

closure get
closure.get()
weakmap get
weakmap.get()
closure incr
closure.incr()
weakmap incr
weakmap.incr()

Run results for: weakmap vs closure

closure get

weakmap get

closure incr

weakmap incr