Topics must know in FrontEnd

---

Javascript

• JS Engine
• Call Stack
• Primitive Types
• Value Types and Reference Types
• Implicit, Explicit, Nominal, Structuring and Duck Typing
• == vs === vs typeof
• Function Scope, Block Scope and Lexical Scope
• Expression vs Statement
• IIFE, Modules and Namespaces
• Message Queue and Event Loop
• setTimeout, setInterval and requestAnimationFrame, how JS Engine works here
• Bitwise Operators, Type Arrays and Array Buffers
• DOM and Layout Trees
• Factories and Classes
• this, call, apply and bind
• new, Constructor, instanceof and Instances
• Prototype Inheritance and Prototype Chain
• Object.create and Object.assign
• map, reduce, filter
• Pure Functions, Side Effects, State Mutation and Event Propagation
• Closures
• High Order Functions/First class function
• Recursion
• Collections and Generators, Iterators, Iterable, Object Descriptors
• Promises
• async/await,
• asunc vs defer
• import vs require
• Babel
• Context in React/Redux
• Data Structures
• Expensive Operation and Big O Notation, Algorithms
• Inheritance, Polymorphism and Code Reuse
• Design Patterns
• Partial Applications, Currying, Compose and Pipe
• Clean Code

React

• LifeCycle Methods
• How react handles bundles file, optimisations, babel, webpack etc.
• UseEffect, useLayout, useMemo, React.Memo
• Debouncing, throlling, implemnation and use case
• react suspense, fallback
• Redux,
• CSR/SSR
• Web Performance -Redux Knowledge

For JS I also added topics from : JS 33 concept