Run results for: Switch case vs Map object

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Browser: Chrome 103

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Switch	284910.8 Ops/sec
Map object	17925.4 Ops/sec

Script Preparation code:

var str = 'abcdefghijklmno';
str = str.charAt(Math.floor(Math.random() * 15));

Tests:

Switch
switch (str) { case 'a': console.log('A'); break; case 'b': console.log('B'); break; case 'c': console.log('C'); break; case 'd': console.log('D'); break; case 'e': console.log('E'); break; case 'f': console.log('F'); break; case 'g': console.log('G'); break; case 'h': console.log('H'); break; case 'i': console.log('I'); break; case 'j': console.log('J'); break; case 'k': console.log('K'); break; case 'l': console.log('L'); break; case 'm': console.log('M'); break; case 'n': console.log('N'); break; case 'o': console.log('O'); break; }
Map object
var map = { a: console.log('A'), b: console.log('B'), c: console.log('C'), d: console.log('D'), e: console.log('E'), f: console.log('F'), g: console.log('G'), h: console.log('H'), i: console.log('I'), j: console.log('J'), k: console.log('K'), l: console.log('L'), m: console.log('M'), n: console.log('N'), o: console.log('O'), }; map[str];