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JavaScript Interview

Prepare for JavaScript interview rounds with curated resources on hoisting, closures, promises, polyfills, patterns, and core language internals.

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Featured25 Top JavaScript Interview Questions for Beginners

JavaScript Basics

Event Loop, Execution Context and V8 JS Engine10

This keyword Rules, Scope9

Variable & function Hoisting concepts9

Clouser and Applications7

Partial functions & chaining 9

Object & Methods6

Array & Methods3

Function & Methods2

Inheritance

Prototypal Inheritance using prototypal chain.6

How prototypal Inheritance works?2

Async JavaScript

How it works, polyfills & questions4

How async operations works in Javascript using promises11

How to use & exception handling3

DOM & BOM

Methods to change various DOM elements.2

Various DOM events4

How to create and handle Custom Events in JavaScript1

Polyfills

Polyfills of call, apply, bind, promises and many more.9

Polyfills of reduce, map, filter etc.11

Polyfills of String methods like includes, indexOf1

Polyfills of promise methods like all, allSettled, race etc.16

Important JavaScript Concepts

Concept & implementation of throttling & debouncing7

How to implement the memoize function in JavaScript2

Understand concept & implementation of compose & pipe functions1

How the proxy works in javascript and the use-case around proxies.1

JS Design Patterns

What is singleton design pattern in javascript and its examples2

Miscellaneous

16

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JavaScript Basics

JS InternalsNewEvent Loop, Execution Context and V8 JS Engine10

Scope & "This" KeywordNewThis keyword Rules, Scope9

HoistingNewVariable & function Hoisting concepts9

ClosuresNewClouser and Applications7

Currying in JS NewPartial functions & chaining 9

Object in JSNewObject & Methods6

Array in JSNewArray & Methods3

Function in JSNewFunction & Methods2

Inheritance

Prototypal ChainNewPrototypal Inheritance using prototypal chain.6

Prototypal InheritanceHow prototypal Inheritance works?2

Async JavaScript

SetTimeout & SetIntervalHow it works, polyfills & questions4

Promises in JSNewHow async operations works in Javascript using promises11

Async/Await in JSHow to use & exception handling3

DOM & BOM

DOM ManipulationMethods to change various DOM elements.2

DOM EventsVarious DOM events4

Custom DOM EventsHow to create and handle Custom Events in JavaScript1

Polyfills

Function Method PolyfillsNewPolyfills of call, apply, bind, promises and many more.9

Array Method PolyfillsNewPolyfills of reduce, map, filter etc.11

String Method PolyfillsPolyfills of String methods like includes, indexOf1

Promise Method PolyfillsNewPolyfills of promise methods like all, allSettled, race etc.16

Important JavaScript Concepts

Throttling & DebouncingNewConcept & implementation of throttling & debouncing7

Memoization in JSHow to implement the memoize function in JavaScript2

Compose & Pipe FunctionsUnderstand concept & implementation of compose & pipe functions1

Proxy PatternNewHow the proxy works in javascript and the use-case around proxies.1

JS Design Patterns

Singleton Design PatternNewWhat is singleton design pattern in javascript and its examples2

Miscellaneous

Other JavaScript TopicsNew16

Stay Updated

JavaScript Basics

JS InternalsNewEvent Loop, Execution Context and V8 JS Engine10

Scope & "This" KeywordNewThis keyword Rules, Scope9

HoistingNewVariable & function Hoisting concepts9

ClosuresNewClouser and Applications7

Currying in JS NewPartial functions & chaining 9

Object in JSNewObject & Methods6

Array in JSNewArray & Methods3

Function in JSNewFunction & Methods2

Inheritance

Prototypal ChainNewPrototypal Inheritance using prototypal chain.6

Prototypal InheritanceHow prototypal Inheritance works?2

Async JavaScript

SetTimeout & SetIntervalHow it works, polyfills & questions4

Promises in JSNewHow async operations works in Javascript using promises11

Async/Await in JSHow to use & exception handling3

DOM & BOM

DOM ManipulationMethods to change various DOM elements.2

DOM EventsVarious DOM events4

Custom DOM EventsHow to create and handle Custom Events in JavaScript1

Polyfills

Function Method PolyfillsNewPolyfills of call, apply, bind, promises and many more.9

Array Method PolyfillsNewPolyfills of reduce, map, filter etc.11

String Method PolyfillsPolyfills of String methods like includes, indexOf1

Promise Method PolyfillsNewPolyfills of promise methods like all, allSettled, race etc.16

Important JavaScript Concepts

Throttling & DebouncingNewConcept & implementation of throttling & debouncing7

Memoization in JSHow to implement the memoize function in JavaScript2

Compose & Pipe FunctionsUnderstand concept & implementation of compose & pipe functions1

Proxy PatternNewHow the proxy works in javascript and the use-case around proxies.1

JS Design Patterns

Singleton Design PatternNewWhat is singleton design pattern in javascript and its examples2

Miscellaneous

Other JavaScript TopicsNew16

Event Loop, Execution Context and V8 JS Engine10

This keyword Rules, Scope9

Variable & function Hoisting concepts9

Clouser and Applications7

Partial functions & chaining 9

Object & Methods6

Array & Methods3

Function & Methods2

Prototypal Inheritance using prototypal chain.6

How prototypal Inheritance works?2

How it works, polyfills & questions4

How async operations works in Javascript using promises11

How to use & exception handling3

Methods to change various DOM elements.2

Various DOM events4

How to create and handle Custom Events in JavaScript1

Polyfills of call, apply, bind, promises and many more.9

Polyfills of reduce, map, filter etc.11

Polyfills of String methods like includes, indexOf1

Polyfills of promise methods like all, allSettled, race etc.16

Concept & implementation of throttling & debouncing7

How to implement the memoize function in JavaScript2

Understand concept & implementation of compose & pipe functions1

How the proxy works in javascript and the use-case around proxies.1

What is singleton design pattern in javascript and its examples2

16

Event Loop, Execution Context and V8 JS Engine10

This keyword Rules, Scope9

Variable & function Hoisting concepts9

Clouser and Applications7

Partial functions & chaining 9

Object & Methods6

Array & Methods3

Function & Methods2

Prototypal Inheritance using prototypal chain.6

How prototypal Inheritance works?2

How it works, polyfills & questions4

How async operations works in Javascript using promises11

How to use & exception handling3

Methods to change various DOM elements.2

Various DOM events4

How to create and handle Custom Events in JavaScript1

Polyfills of call, apply, bind, promises and many more.9

Polyfills of reduce, map, filter etc.11

Polyfills of String methods like includes, indexOf1

Polyfills of promise methods like all, allSettled, race etc.16

Concept & implementation of throttling & debouncing7

How to implement the memoize function in JavaScript2

Understand concept & implementation of compose & pipe functions1

How the proxy works in javascript and the use-case around proxies.1

What is singleton design pattern in javascript and its examples2

16