Run results for: Hex convertion : Mapping vs Range

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:124.0) Gecko/20100101 Firefox/124.0

Browser: Firefox 124

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one month ago

Test name	Executions per second
Mapping	101137.2 Ops/sec
Range	264705.0 Ops/sec

Script Preparation code:

a = [...Array(1024)].map(_ => Math.floor(Math.random()*256))

Tests:

Mapping
let d = 0; for (const b of a) { const c = b < 0x30 || b > 0x66 ? null // fast fail : [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, null, null, null, null, null, null, null, // :;<=>?@ 10, 11, 12, 13, 14, 15, // ABCDEF null, null, null, null, null, null, // GHIJKL null, null, null, null, null, null, null, // MNOPQRS null, null, null, null, null, null, null, // TUVWXYZ null, null, null, null, null, null, // [\]^_` 10, 11, 12, 13, 14, 15, // abcdef ][b - 0x30]; if (c !== null) { d += c; } }
Range
let d = 0; for (const b of a) { const c = b < 0x30 || b > 0x66 ? null // fast fail : b <= 0x39 // 0-9 ? b - 0x30 : b >= 0x41 && b <= 0x46 // A-F ? b - 0x37 // 0x41 - 10 : b >= 0x61 // a-f ? b - 0x57 // 0x61 - 10 : null; if (c !== null) { d += c; } }