Run results for: WeakMap vs arrays read performancesadsasd

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser: Chrome 136

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

arrays

5K/s

weakmap

1K/s

View exact numbers

Test name	Executions per second
✓ arrays	5,077 Ops/sec
weakmap	1,205 Ops/sec

Script Preparation code:

var keys = [];
var values = [];
var weakmap = new WeakMap();
for (let i = 0; i < 100000; i++) {
    const keyobj = {
        key: i
    };
    const valobj = {
        val: `val_${i}`
    };
    keys[i] = keyobj;
    values[i] = valobj;
    weakmap.set(keyobj, valobj);
}

Tests:

arrays
for (let i = 0; i < 100000; i++) { const key = keys[i]; const val = values[key.key]; }
weakmap
for (let i = 0; i < 100000; i++) { const key = keys[i]; const val = weakmap.get(key); }