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Awesome JavaScript Interviews

A collection of super-popular Interview questions, along with explanations and implementation examples that I was putting together for myself while preparing for my first Full-Stack JavaScript job interviews.

Table of Contents of this Readme file

1. Most common Fundamental JavaScript Interview Topics & Questions

2. Most common Tricky Javascript Interview Topics & Questions

3. Most common Async/Await and Promise related Interview Topics & Questions

4. Most common Node Interview Topics & Questions

5. Most common Web-Development Architecture related Interview Topics & Questions

6. Most common React Interview Topics & Questions

7. Most common Redux Interview Topics & Questions

8. Most common Angular Interview Topics & Questions

9. Most common MongoDB Interview Topics & Questions

10. Most common HTML Interview Topics & Questions

11. Most common CSS Interview Topics & Questions

12. Most common Git and Github related Interview Topics & Questions

13. Understanding the Theory and the fundamentals of some super-popular Algorithm questions

14. Github Repositories with large collections of problems-and-solutions of them most popular Interview challenges

15. Overall multi-factor approach for winning this huge challenge and a great journey of getting the first Developer Job

16. Other important resources

17. Coding Challenge Practice Platforms

18. More curated list of general resources for JavaScript Interviews

19. Most frequently asked concepts for Front End Engineering Interview

20. List of sites where you can hunt for a developer job

21. Want a startup job?

22. Best places to job hunt for remote jobs

23. Here are a few places to hunt for ios, react, vue and more

24. Want a list of just JavaScript jobs?

25. Are you looking for a junior dev job?

26. Women focused job boards!

27. Want a job as a freelance dev? Here's a list

28. Some useful websites for programmers

29. When you get stuck

30. For small project ideas

31. General Coding advice

32. Coding Style

33. General Good Articles

34. Collection of Leetcode Problem solution

35. Collection of Cracking the Coding Interview Book Problem solution

36. Most common System-Design Interview Topics & Questions

37. System-Design related topics-Some very useful articles

38. System-Design-Company engineering blog

[↑] Back to top

Most common Fundamental JavaScript Interview Topics & Questions

(Below Links are all within this Repository)

• Explain event delegation
• Explain how this works in JavaScript
  • more-on this keyword
  • more on this keyword
  • more-on-this-keyword
• Explain how prototypal inheritance works
  • how-to-get-prototype-of-an-object
  • Inheritance-OOP-Class-vs-Prototypes-Example
  • Inheritance-OOP-Class-vs-Prototypes-Theory
  • Inheritence-with-classes-super-keyword-Exhaustive-Explanation
  • OOP-Basics-1
  • OOP-basics-2
  • OOP-Encapsulation-example-1
  • OOP-Encapsulation-example-2
  • OOP-Encapsulation-Theory-GOOD-Explanations-Private-Methods
  • print-All-Prototypes-of-Objects
  • Prototype-Example-Really-GOOD-Explanations
  • Prototype-Example-1
  • Prototype-Example-2
  • prototype-func-print-array-elements
  • Prototype-func-String-dasherize
  • Prototypes-Benefits-Handling-Memory-Leaks
  • Prototypes-Prevents-Memory-Leaks-1-Good-Explanation
• Explain the concepts around and the difference between Call, Apply and Bind
  • More on Call, Apply and Bind
  • More on Call, Apply and Bind
  • call-vs-apply-vs-bind
  • Why bind function is needed
• arrow-vs-regular-functions
• when-not-to-use-arrow-function
• arrow-function-and-this-keyword
• Destructuring - some examples
• filter method implementation
• forEach-vs-map
• Pure-functions-basics
• closure explanations
• closure-MOST-POPULAR-Interview Question on setTimeout
  • Basics closure concepts involving setTimeout
  • closure-tricky and great Example
  • closure-use-case-for-creating-private-variable
  • closure-why-its-needed at all
  • More on Closure
• Custom Callback Function-1
• Custom Callback Function-2
• IIFE function in 10 different ways
• IIFE
• scope in JS - A basic-understanding
• Data Types in JS
  • BigInt-data-type
  • check-data-type-with-typeof
  • data-type-mutability
  • data-types of Number-A very popular Interview Question
  • More on data-types of Number
  • data-types-symbol
  • what-is-type-coercion
  • More on coercion
• spread-operator-vs-rest-parameters
• rest-spread-basic-techniques
• More on rest and spread operator
• Example of Call Stack
• const-var-let
• curried-function
• execution-context-call-stack.md
• hashing-vs-encrypting.md
• Hoisting - The supre important concept
• is-javascript-static-or-dynamically-typed
• is-JS-block-scoped-or-function-scoped
• map-set-get
• Null-Coalescing-operator
• truthy-falsy-1
• truthy-falsy-2
• truthy-falsy-pass-by-value-vs-reference-strict-equality-use-case
• passing-by-value-and-by-reference
• undefined-vs-not_defined
• Why-eval-function-considered-dangerous
• use-strict-describe
• How would you compare two objects in JavaScript?
• Memoize a function
• repaint-reflow
• What are events?
• What are the options in a cookie

[↑] Back to top

Most common Tricky Javascript Interview Topics & Questions

(Below Links are all within this Repository)

• Collection-of-Tricky-JS-Questlions
• closure-tricky and great Example
• logical-and-operator-Tricky Question
• Value of Null
• pitfall-of-using-typeof
• What-is-the-value-of-Math.max([2,3,4,5])
• not-not-operator-in-javascript
• why-does-adding-two-decimals-in-javascript-produce-a-wrong-result
• typeof-NaN
• If null is a primitive, why does typeof(null) return "object"?
• null-vs-undefined
• Closures-Inside-Loops

[↑] Back to top

Most common Async/Await and Promise related Interview Topics & Questions

(Below Links are all within this Repository)

• Async/Await - Understanding the fundamentals
• asyn-await-how-its-called-asynchronous-when-it-makes-possible-to-execute-in-synchrounous-manner
• Example async-await-1
• Example async-await-2
• Example async-await-3
• async-await-absolute-basics
• async-await-example-when-Promise-is-preferred
• converting-callback-to-Promise-and-async-await-1
• converting-callback-to-Promise-and-async-await-2
• setTimeout-rate-limiting-api-calls-IMP-with-async-await-looping-over-apis-1
• setTimeout-rate-limiting-api-calls-IMP-with-async-await-looping-over-apis-2
• Promise - Fundamental Understanding
• calback-hell-resolved-with-promise
• More callback-hell-examples
• How-Promise-makes-code-Asynchronous-non-blocking
• Promise Super simple-Examples
• More Promise Super simple Examples
• More Promise Super simple Examples
• Understanding then in Promise
• Promise-super-basic-example-transform-values-with-Promise
• Promise-Absolute basic-syntax
• Async-await-API-call-Simple-Example-synchronous-Fetch
• Async-Event-Handler-both-async-await-and-with-Promise-1
• multiple-API-calls-before-executing-next-function-in-React-Promise-2
• multiple-API-fetch-before-executing-next-function-in-React-Promise-1
• multiple-sequential-axios-request
• sequential-execution-async-await-in-Express-routes
• sequential-execution-fundamental_working-THEORY
• sequential-execution-plain-callback-in-Express-routes

[↑] Back to top

Most common Node Interview Topics & Questions

(Below Links are all within this Repository)

• why-nodejs-required-at-all-and-difference-vs-plain-js
• How-nodejs-works
• What-is-an-error-first-callback
• Authentication vs Authorization
• What is Middleware-1
• What is Middleware-2
• app.use-vs-app.get
• bcrypt-How-it-works-de-hashing
• bcrypt-manually-generate-a-salted-and-encrypted-password
• bodyParser_what-does-it-do
• buffer-class-what-is-it
• busboy-why-its-needed
  • busboy-why-I-use-stream-to-upload-file
• cookie-parser-what-does-it-do
• cors_Why_its_needed
• error-handling-in-node-Theory
• More on error-handling-in-node
• express-js-why-do-i-need-it
• gracefully-shut-down-node-app
• jwt-how-it-works
• jwt-where-to-save-localStorage-vs-sessionStorage-vs-cookie
• session-cookies-vs-JWT-Tokens-2-ways-to-authenticate
• sesstionStorage-vs-localStorage-vs-Cookie
• localForage-what-does-it-do
• How would you do node-debugging
• passport-authentication-middleware-BASIC-FLOW
• passport-express-session-Fundamentals-and-params
• passport-express-session-how-it-works
• passport-workflow-with-passport-local-strategy
• pipe concepts in node
• REST-architectural-concepts
• significance-of-file-bin-www
• Streams Concepts in Node

[↑] Back to top

Most common Web-Development Architecture related Interview Topics & Questions

(Below Links are all within this Repository)

• critical-render-path
• How-to-Check-HTTP-Request-Response-on-Chrome
• HTTP-and-TCP-Difference
• HTTP-methods-put-vs-post
• HTTP-Protocol
• HTTP-Status-Codes-Understanding-Express-res.status
• More on HTTP-Status-Codes
• http-vs-https
• minimize-page-load-time
• Postman-checking-protected-routes-from-backend
• websocket-basics
• What-happens-when-you-navigate-to-an-URL
• What-happens-when-you-navigate-to-google
• what-is-AJAX

[↑] Back to top

Most common React Interview Topics & Questions

(Below Links are all within this Repository)

• Element-vs-Component-in-React
• What is a Prop - props-Absolute-Basics
• Life-Cycle-Fundamentals
• Life Cycle Methods - getDerivedStateFromProps
• Life Cycle Methods - shouldComponentUpdate-what-does-it-do
• Life Cycle Methods - constructor-vs-componentwillmount
• React-Hooks-convert-ClassBasedForm-to-HooksBasedForm
  • hooks-updateState-with-callback
  • lifeCycle-methods-for-various-hooks
  • Shallow-comparison-React-useEffect-compare-array-in-second-argument
  • useEffect-basics-1
  • useEffect-api-call-with-async-inside-useEffect
  • More on useEffect-async-call-inside
  • useEffect-compare-array-in-second-argument-replace-ComonentDidMount-with-useRef
  • useEffect-compare-array-in-second-argument-shallow
  • useEffect-replace-componentDidMount-and-Update
  • useEffect-replace-componentWillUnmount
  • useEffect-running-callback-after-setState-IMPORTANT
  • useEffect-with-Redux-actions
  • useReducer-basics-1
  • userReducer-vs-redux-reducer
  • useState-replace-componentWillReceiveProps-getDerivedStateFromProps
• styled-component-basics
• styled-component-a-clean-example
• Testing-react-shallow-renderer-basics
• snapshot-testing
• React Testing - where-should-enzyme-setup-file-be-written
• refs-in-React
  • refs-Call-child-method-from-parent
  • execute-child-function-from-parent
  • refs-vs-keys-when-to-use-ref
  • useRef-basics
• context-api-basics
• controlled-unContolled-Component
• Create-Class-avoiding-binding-in-constructor
• destructuring_basics-js
• More destructuring_example
• More Destructuring explanations and examples
• destructuring_in_react-1
• More destructuring_in_react
• What is e.target.value
• Explain-whats-wrong-with-this-React-code
• functional-component-declaration-syntax
• More examples on functional-component-declaration-syntax
• HOC - Higher Order Component
• how-react-decide-to-re-render-a-component
• Unique keys-for-li-elements-why-its-needed
• onChange-updating-state-from-child
• pass-props-from-Parent-To-Child-Component-communication
  • pass-prop-to-component-rendered-by-React-Router
  • More on pass-props-from-Child-to-parent-Component-communication
  • More on pass-props-from-Child-to-parent-Component-communication-2
• preventDefault-in-React
• pureComponent - What they are
• pureComponent-Performance-benefit
• react-hot-loader
• React.Fragment
• Redirect-from-react-router-dom
• server-side-rendering-react-app
• setState-what-does-it-do
• super(props)-why-its-required
• this.props.children
• Virtual-DOM-and-Reconciliation-Algorithm
• What are the approaches to include polyfills in your create-react-app

[↑] Back to top

Most common Redux Interview Topics & Questions

(Below Links are all within this Repository)

• What is Redux Actions
• actions-why-enclosed-in-curly-braces
• What are actions.payload
• What is applyMiddleware
• What is bindActionCreators
• What is combine-Reducer
• What is compose-function
• What is Connect function
• What is container-component
• What is createStore
• Example of Currying
• What is dispatch
• flux-vs-redux
• What is mapDispatchToProps
• mapStateToProps-basic-understanding-1
• mapStateToProps-basic-understanding-2
• mapStateToProps-how-exactly-it-gets-the-state-from-reducers
• What is Provider
• What is Reducers
• What is Redux Thunk
• what-is-thunk-in-programming
• What is Store
• Why-Redux-needs-reducers-to-be-pure functions
• immutable-state-store-in-React-Redux-2
• immutable-state-store-in-React-Redux-Pass-by-Reference-shallow-comapre

[↑] Back to top

Most common Angular Interview Topics & Questions

(Below Links are all within this Repository)

• AsyncPipe-fundamentals
• AsyncPipe-basic-Oberservable-use-case
• converting-a-subscribe-to-asyncPipe-1
• converting-a-subscribe-to-asyncPipe-Simplest-use-case
• Converting-a-subscribe-to-asyncPipe-3
• Component-Communications-via-Input
• Component-Communications-via-Output-EventEmitter
• ContentChildren-basics
• decorators-basics-in-angular
• decorators-basics-in-typescript
• Property-decorators-basics-in-angular-1
• Property-Decorators-Typescript-1
• Property-Decorators-Typescript-2
• QueryList-basics
• TemplateRef-basics-1
• TemplateRef-basics-2
• ViewChild-basics
• AfterViewInit-hook
• ngOnChanges-Fundamentals
• ngOnChanges-SimpleChanges_interface
• ngOnInit-vs-Constructor
• ngOnInit-vs-ngAfterViewInit
• ngOnChange-BestPractice
• cold-vs-hot-observable
• examples-cancellable-with-takeUntil
• examples-observable-is-Lazy
• Observable-basics
• Observable-simple-implementation-1
• Observable-vs-Promises
• subscribe-method
• Reading-Route-Parameters in Angular

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