Run results for: Math.sqrt(x * x) vs Math.sqrt(x ** 2)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.4 Safari/605.1.15

Browser: Safari 26

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 5 months ago

Benchmark engine: Benchmark.js

Math.sqrt(x ** 2)

5.2M/s

Math.sqrt(x * x)

4.9M/s

View exact numbers

Test name	Executions per second
✓ Math.sqrt(x ** 2)	5,233,494 Ops/sec
Math.sqrt(x * x)	4,898,474 Ops/sec

Script Preparation code:

const x = 123.456;
const y = 789.123;

Tests:

Math.sqrt(x * x)
Math.sqrt(x * x + y * y); const z = Math.random() Math.sqrt(z * z);
Math.sqrt(x ** 2)
Math.sqrt(x ** 2 + y ** 2); const z = Math.random() Math.sqrt(z ** 2);