JavaScript is awesome

js-trick.md

JavaScript Trick

umm...

1. casting

'1' + 1 // 11
'1' - 1 // 0
1 + '1' - '1' // 10

2. reserved word

var undefined = 1
undefined // 1

this feature is deprecated. undefined and NaN become non-writable property in modern browser and node

3. 🍌

('b' - 'a' + + 'a' + 'a').toLowerCase() // banana

4. sorting

[1, 2, 100].sort() // [1, 100, 2]

5. unicode

'👨‍👩‍👧‍👧'.length // 11

6. override length

const arr = [1, 2, 3, 4]
arr.length = 2
arr // [1, 2]