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JavaScript

Core

  • Variables & Data Types
  • Variable Hoisting
  • var, let, const
  • Functions
  • Function Declarations vs Expressions
  • Scope & Closures
  • Function Scope, Block Scope
  • Closures
  • this
  • DOM
  • DOM Manipulation
  • Event Handling

Intermediate

  • Prototype Chain
  • Async Programming
  • Callbacks
  • Promises
  • Async/Await
  • JavaScript Event Loop
  • ES6+ Features
  • Arrow Functions
  • Destructuring
  • Spread & Rest Operators
  • Error Handling
  • try/catch
  • Custom Errors

Advanced

  • Advanced Closures
  • Advanced this Binding
  • call, apply, bind
  • Inheritance & Prototypes
  • ES6 Classes
  • Inheritance Patterns
  • Memory Management
  • Garbage Collection
  • Memory Leaks
  • Performance Optimization
  • Throttling & Debouncing
  • Design Patterns
  • Module Pattern
  • Singleton Pattern

From list of david

JS

  • [X] Execution context, especially lexical scope and closures.
  • [X] Hoisting, function & block scoping and function expressions & declarations.
  • [X] Binding – specifically call, bind, apply and lexical this.
  • [X] Object prototypes, constructors and mixins.
  • [ ] Handling asynchronous calls with callbacks, promises, await and async.
  • [ ] Composition and high order functions.
  • [ ] Event delegation and bubbling.
  • [ ] Type Coercion using typeof, instanceof and Object.prototype.toString.
  • [ ] When to use function declarations and expressions.

DOM

  • [ ] Selecting or finding nodes using document.querySelector and in older browsers document.getElementsByTagName.
  • [ ] Traversal up and down – Node.parentNode, Node.firstChild, Node.lastChild, and Node.childNodes.
  • [ ] Traversal left and right – Node.previousSibling and Node.nextSibling.
  • [ ] Manipulation – add, remove, copy, and create nodes in the DOM tree. Know operations such as how to change the text content of a node and toggle, remove, or add a CSS classname.
  • [ ] Performance – touching the DOM can be expensive when you have many nodes; know about document fragments and node caching.

Optimization

Reference: - Preparing for a Front-End Web Development Interview in 2017