Run results for: Switch vs. dictionary

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/129.0.6668.69 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 129

Operating system: iOS 18.0

Device Platform: Mobile

Date tested: one month ago

Test name	Executions per second
Switch	19008192.0 Ops/sec
If	5835695.5 Ops/sec

Script Preparation code:

var random = Math.floor(Math.random() * 20);

Tests:

Switch
switch (random) { case 0: random = -Math.PI; break; case 1: random = Math.EPSILON; break; case 2: case 3: case 4: case 5: case 6: case 7: case 8: case 9: random = 1; break; case 10: case 11: case 12: random /= 5; break; case 13: case 14: case 15: case 16: case 17: random **= 2; break; case 18: random = 5; break; case 19: random = 28; break; case 20: random = 0; break; default: random = -1; break; }
If
const test = { 0: () => -Math.PI, 1: () => Math.EPSILON, 2: () => 1, 3: () => 1, 4: () => 1, 5: () => 1, 6: () => 1, 7: () => 1, 8: () => 1, 9: () => 1, 10: (rand) => rand / 5, 11: (rand) => rand / 5, 12: (rand) => rand / 5, 13: (rand) => rand ** 2, 14: (rand) => rand ** 2, 15: (rand) => rand ** 2, 16: (rand) => rand ** 2, 17: (rand) => rand ** 2, 18: () => 5, 19: () => 28, 20: () => 0, }; random = test[random]?.() || -1;

Run results for: Switch vs. dictionary

Switch

If