Benchmark: WeakMap vs arrays read performance !!

Tests:

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

Rendered benchmark preparation results:

Previous results

Test case name	Result
arrays
weakmap

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Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Browser/OS: Chrome 103 on Mac OS X 10.15.7

Test name	Executions per second
arrays	35.9 Ops/sec
weakmap	37.0 Ops/sec

WeakMap vs arrays read performance !! (version: 0)