denysdovhan/wtfjs

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What the f*ck JavaScript?

Node Packaged Manuscript

Translations

Table of Contents

💪🏻 Motivation

✍🏻 Notation

👀 Examples

[] is equal ![]

💡 Explanation:

true is not equal ![], but not equal [] too

💡 Explanation:

true is false

💡 Explanation:

baNaNa

💡 Explanation:

NaN is not a NaN

💡 Explanation:

Object.is() and === weird cases

💡 Explanation:

It's a fail

💡 Explanation:

[] is truthy, but not true

💡 Explanation:

null is falsy, but not false

💡 Explanation:

document.all is an object, but it is undefined

💡 Explanation:

Minimal value is greater than zero

💡 Explanation:

function is not a function

💡 Explanation:

Super constructor null of Foo is not a constructor

💡 Explanation:

Adding arrays

💡 Explanation:

Trailing commas in array

💡 Explanation:

Array equality is a monster

💡 Explanation:

undefined and Number

💡 Explanation:

parseInt is a bad guy

Math with true and false

💡 Explanation:

HTML comments are valid in JavaScript

💡 Explanation:

NaN is not a number

💡 Explanation:

[] and null are objects

💡 Explanation:

Magically increasing numbers

💡 Explanation:

Precision of 0.1 + 0.2

💡 Explanation:

Patching numbers

💡 Explanation:

Comparison of three numbers

💡 Explanation:

Funny math

💡 Explanation:

Addition of RegExps

💡 Explanation:

Strings aren't instances of String

💡 Explanation:

Calling functions with backticks

💡 Explanation:

Call call call

💡 Explanation:

A constructor property

💡 Explanation:

Object as a key of object's property

💡 Explanation:

Accessing prototypes with __proto__

💡 Explanation:

`${{Object}}`

💡 Explanation:

Destructuring with default values

💡 Explanation:

Dots and spreading

💡 Explanation:

`[]` is equal `![]`

`true` is not equal `![]`, but not equal `[]` too

`NaN` is not a `NaN`

`Object.is()` and `===` weird cases

`[]` is truthy, but not `true`

`null` is falsy, but not `false`

`document.all` is an object, but it is undefined

`undefined` and `Number`

`parseInt` is a bad guy

Math with `true` and `false`

`NaN` is not a number

`[]` and `null` are objects

Precision of `0.1 + 0.2`

Strings aren't instances of `String`

A `constructor` property

Accessing prototypes with `proto`

Insidious `try..catch`

`arguments` and arrow functions

`Number.toFixed()` display different numbers

`Math.max()` less than `Math.min()`

Comparing `null` to `0`

`{}{}` is undefined

`arguments` binding

An `alert` from hell

A `setTimeout` object

Non-strict comparison of a number to `true`