How much deep should web developer go in JavaScript ?

Question

How much knowledge a web developer should be having about JavaScript for better understanding of Front End

Answer 1

These concepts that every modern JavaScript developer should know well follow:

1. JavaScript Objects in Detail
2. JavaScript Prototype in Plain, Detailed Language
3. JavaScript Variable Scope and Hoisting Explained
4. Understand JavaScript Closures With Ease
5. Understand JavaScript Callback (Higher-Order) Functions
6. Understand JavaScript’s “this” With Clarity, and Master It
7. JavaScript’s Apply, Call, and Bind Methods are Essential
8. Learn HTML5, CSS3, and Responsive WebSite Design
9. Object Oriented JavaScript (OOP in JavaScript)
10. Learn Node.js Completely and With
11. Confidence Or Learn Meteor.js Properly
12. JavaScript Custom Events with PubSub (coming soon)
13. Unit Testing Your JavaScript Applications is Essential
14. DOM (Document Object Model) and BOM (Browser Object Model)
15. ECMAScript 3 and 5
16. The Best JavaScript Front-end Frameworks You Should be Using
17. Preventing and Handling JavaScript Errors and Debugging Your Code
BONUS: JavaScript Design Patterns that Every JavaScript Developer Should Know (coming soon)