JS By Example
JS By Example For Noob
❱
1. Hello World
  ❱
3. Types and Values
4. Variable
  ❱
5. 1. Identifiers
6. Operators
  ❱
8. Function
9. Flow of Control
  ❱
10. 1. Conditionals
  2. Iterative
11. Exercise
  ❱
12. 1. Guess the output
  2. Fix the code
  3. Odd one out
JS By Example For Coder
❱
1. Types and Values
  ❱
2. 1. Primitive vs Reference
  2. Objects
    ❱
  3. 1. Prototype
    2. Prototypal Inheritance
  4. Array
3. Variables
  ❱
4. 1. Blocks Scope vs Function Scope
  2. Hoisting
5. Functions
  ❱
6. 1. Arrow functions
  2. Constructor functions
  3. IIFE
  4. this keyword
    ❱
  5. 1. call, apply & bind
7. Class
  ❱
8. 1. Under the hood
  2. this keyword again
9. Asynchronous JavaScript
  ❱
10. 1. Callback
  2. Promise
  3. Async & Await
JS By Example For WebDev
❱
1. window
  ❱
2. 1. Blocks Scope vs Function Scope
  2. Hoisting

Online playground

There are many online playgrounds where you can run you JavaScript code. Some of them are

CodePen

CodeSandbox

They are ordered in the increasing level of complexity (features).