Weird JavaScript Snippet

weird.js

// 1.
'0' == 0 // true
0 == [] // true
'0' == [] // false

// 2.
['10', '10', '10'].map(parseInt) // [10, NaN, 2]

// 3.
let obj = {bar:0}
for (obj.bar of [1,2]) {}
console.log(obj.bar) // 2

// 4. run two lines at once.
(function () { console.log('hi') })() 
[1,2].slice() // TypeError: Cannot read property '2' of undefined

// 5. parseInt
parseInt('null', 10) // NaN
parseInt('null', 23) // NaN
parseInt('null', 24) // 23

Omg... Welcome to the Alice's JavaScript Wonderland!

"My mom always said life was like a box of JavaScript. You never know what you're gonna get." - by Forest Gump