Run results for: map vs closure vs symbols

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36

Browser: Chrome 83

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
closure get	6574933.0 Ops/sec
map get	2712183.0 Ops/sec
closure incr	5387748.0 Ops/sec
map incr	1501829.0 Ops/sec
symbol incr	5138747.0 Ops/sec
symbol get	4793462.0 Ops/sec

Script Preparation code:

function A() {
	var x = 0;
	return {
		incr() { x ++ },
		get() { return x },
	}
}
var closure = A();
closure.incr()

var wm = new Map();
function B() {
	var x = {
		incr() { wm.set(x, (wm.get(x) || 0) + 1) },
		get() { return wm.get(x) },
	}
	return x
}
var weakmap = B();
weakmap.incr()


function C() {
	var me = Symbol('me');
	var x = {
		incr() { x[me]++ },
		get() { return x[me] },
		[me]: 0,
	}
	return x
}
var symbols = C();
symbols.incr()

Tests:

closure get
closure.get()
map get
weakmap.get()
closure incr
closure.incr()
map incr
weakmap.incr()
symbol incr
symbols.incr()
symbol get
symbols.get()

Run results for: map vs closure vs symbols

closure get

map get

closure incr

map incr

symbol incr

symbol get