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Run results for:
Typeof GlobalThis Check
Memoizing a key typeof check in high frequency
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<iframe src="https://measurethat.net/Embed?id=585065" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:89.0) Gecko/20100101 Firefox/89.0
Browser:
Firefox 89
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
Call typeof every time
481/s
Memoize typeof call
452/s
View exact numbers
Test name
Executions per second
✓
Call typeof every time
481 Ops/sec
Memoize typeof call
452 Ops/sec
Tests:
Memoize typeof call
let cachedGlobal; function getGlobal() { if (cachedGlobal) { return cachedGlobal; } if (typeof globalThis !== 'undefined' && globalThis) { cachedGlobal = globalThis; } return cachedGlobal } for (let i = 0; i < 4000; i++) { const global = getGlobal(); }
Call typeof every time
function getGlobal() { if (typeof globalThis !== 'undefined' && globalThis) { return globalThis; } } for (let i = 0; i < 4000; i++) { const global = getGlobal(); }