Run results for: Jump vs switch case

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.2 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.2

Device Platform: Mobile

Date tested: one year ago

jump table

2K/s

switch case

712/s

View exact numbers

Test name	Executions per second
✓ jump table	2,199 Ops/sec
switch case	712 Ops/sec

Tests:

switch case
function thing(j) { switch(j) { case 0: return "rah"; case 1: return "lah"; case 2: return "sah"; case 3: return "blah"; } } for(let i = 0; i < 100000; i++) { for(let j = 0; thing(j) != "blah"; j++) { } }
jump table
function rah() { return "rah"; } function lah() { return "lah"; } function sah() { return "sah"; } function blah() { return "blah"; } let jumpTable = [rah, lah, sah, blah]; for(let i = 0; i < 100000; i++) { for(let j = 0; jumpTable[j]() != "blah"; j++) { } }