wtfjs

What the f\ck JavaScript?

Node Packaged Manuscript

Translations

Table of Contents

💪🏻 Motivation

✍🏻 Notation

👀 Examples

`[]` is equal `![]`

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

true is false

baNaNa

`NaN` is not a `NaN`

It's a fail

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

`null` is falsy, but not `false`

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

Minimal value is greater than zero

function is not a function

Adding arrays

Trailing commas in array

Array equality is a monster

`undefined` and `Number`

`parseInt` is a bad guy

Math with `true` and `false`

HTML comments are valid in JavaScript

`NaN` is not a number

`[]` and `null` are objects

Magically increasing numbers

Precision of `0.1 + 0.2`

Patching numbers

Comparison of three numbers

Funny math

Addition of RegExps

Strings aren't instances of `String`

Calling functions with backticks

Call call call

A `constructor` property

Object as a key of object's property

Accessing prototypes with `proto`

`${{Object}}`

Destructuring with default values

Dots and spreading

Labels

Nested labels

Insidious `try..catch`

Is this multiple inheritance?

A generator which yields itself

A class of class

Non-coercible objects

Tricky arrow functions

Arrow functions can not be a constructor

`arguments` and arrow functions

Tricky return

Accessing object properties with arrays

Null and Relational Operators

`Number.toFixed()` display different numbers

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

Comparing `null` to `0`

Same variable redeclaration

📚 Other resources

🎓 License