Run results for: Pre-calc with bit shift vs Typical Code

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Typical Code	1307152.0 Ops/sec
Bit-shift	1783667.2 Ops/sec

Script Preparation code:

var cases = [
  { nx: undefined, ny: 12 },
  { ny: 12, nx: undefined },
  { nx: undefined, ny: undefined },
  { nx: 12, ny: 12 }
]
var style = { transform: null }

Tests:

Typical Code
for (const {nx, ny} of cases) { if (nx !== undefined || ny !== undefined) { style.transform = nx !== undefined ? (ny !== undefined ? `translate(${nx}px, ${ny}px)` : `translateX(${nx}px)`) : `translateY(${ny}px)`; } }
Bit-shift
for (const {nx, ny} of cases) { const sx = nx !== undefined // state_x const sy = ny !== undefined // state_y const state = (sx && ! sy ? 1 : 0) | (sy && ! sx ? 2 : 0) | (sx && sy ? 4 : 0) | ( ! sx || ! sy ? 8 : 0) switch (state) { case 8: // neither style.transform = '' break case 4: // both style.transform = `translate(${nx}px, ${ny}px)` break case 2: // only y style.transform = `translateY(${ny}px)` break case 1: // only x style.transform = `translateX(${nx}px)` break; } }

Run results for: Pre-calc with bit shift vs Typical Code

Typical Code

Bit-shift