Run results for: Map vs Object vs Reduce

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.72 Safari/537.36

Browser: Chrome 90

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Numbers Map	4905.4 Ops/sec
Numbers Object	5351.3 Ops/sec
Strings Map	4387.2 Ops/sec
Strings Object	4467.2 Ops/sec

Script Preparation code:

var numberSet = new Array(10000).fill(0).map(() => Math.floor(Math.random() * 20))
var stringSet = new Array(10000).fill(0).map(() => Math.random().toString(16).slice(2, 7))

var numberMap = new Map();
var stringMap = new Map();

var numberObject = {};
var stringObject = {};

Tests:

Numbers Map
numberSet.forEach((num) => numberMap.set((numberMap.get(num) || 0) + 1))
Numbers Object
numberSet.forEach((num) => numberObject[num] = (numberObject[num] || 0) + 1)
Strings Map
stringSet.forEach((num) => stringMap.set((stringMap.get(num) || 0) + 1))
Strings Object
stringSet.forEach((num) => stringObject[num] = (stringObject[num] || 0) + 1)
Numbers Object Reduce
numberSet.reduce((obj, num) => { obj[num] = (obj[num] || 0) + 1; return obj; }, {})
Strings Object Reduce
stringSet.reduce((obj, string) => { obj[string] = (obj[string] || 0) + 1; return obj; }, {})

Run results for: Map vs Object vs Reduce

Numbers Map

Numbers Object

Strings Map

Strings Object

Numbers Object Reduce

Strings Object Reduce