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Event loop is a mechanism in JavaScript that allows for asynchronous operations to be executed in a non-blocking way.
Event loop is responsible for handling asynchronous operations in JavaScript.
It allows for non-blocking execution of code by moving asynchronous tasks to the event queue.
Event loop continuously checks the call stack and the event queue, moving tasks from the queue to the stack when the stack is empty.
Exa...
Closures are functions that have access to their own scope, as well as the scope in which they were defined.
Closures allow functions to access variables from their outer scope even after the outer function has finished executing.
They are commonly used to create private variables in JavaScript.
Closures are created whenever a function is defined within another function.
I applied via Company Website and was interviewed in May 2021. There were 3 interview rounds.
React 16 introduced new features like React Fiber, Error Boundaries, Portals, and improved server-side rendering.
React Fiber is a new reconciliation engine that improves performance and enables incremental rendering.
Error Boundaries allow developers to catch and handle errors in components.
Portals provide a way to render children into a different DOM subtree.
Improved server-side rendering with support for streaming and...
React hooks simplify state management and lifecycle methods in functional components.
Hooks allow functional components to have state and lifecycle methods
They reduce the need for class components and HOCs
Hooks make code more readable and easier to test
Examples of hooks include useState, useEffect, and useContext
HOC components are higher-order components in React that allow code reuse and logic sharing.
HOC components are functions that take a component and return a new component with additional functionality.
They are used to abstract common logic and behaviors into reusable components.
HOC components can be used for tasks like authentication, logging, and code reuse.
Example: a withAuth HOC component that adds authentication log
I applied via Naukri.com and was interviewed in Aug 2021. There were 4 interview rounds.
To make a page responsive, use Bootstrap layouts and alerts.
Use Bootstrap's grid system to create responsive layouts
Use media queries to adjust the layout based on screen size
Use Bootstrap's responsive utility classes to hide/show elements on different devices
Use Bootstrap's responsive navigation components for mobile-friendly menus
Use Bootstrap's responsive images to ensure they scale properly
Use Bootstrap's responsiv...
I applied via Naukri.com and was interviewed in Apr 2022. There was 1 interview round.
Closures and hoisting are important concepts in JavaScript.
Closures refer to the ability of a function to access variables in its outer scope even after the function has returned.
Hoisting is the behavior of moving variable and function declarations to the top of their respective scopes.
Example of closures: function outer() { let x = 10; function inner() { console.log(x); } return inner; } const innerFunc = outer(); inn...
I applied via Recruitment Consulltant and was interviewed in Mar 2022. There was 1 interview round.
Hoisting is a JavaScript behavior where variable and function declarations are moved to the top of their containing scope.
Hoisting applies to both variable and function declarations.
Variable declarations are hoisted but not their initializations.
Function declarations are fully hoisted, allowing them to be called before they are declared.
Hoisting does not apply to variables declared with let or const.
Hoisting can lead t...
Higher-order functions are functions that take one or more functions as arguments or return a function as their result.
Higher-order functions can be used to create reusable code by abstracting common patterns.
They enable functional programming paradigms like currying and composition.
Examples of higher-order functions in JavaScript include map, filter, and reduce.
var is function scoped, let and const are block scoped.
var can be redeclared and updated within its scope
let can be updated but not redeclared within its scope
const cannot be updated or redeclared once declared
let and const are not hoisted like var
const must be initialized during declaration
Hooks are a feature in React.js that allow developers to use state and other React features in functional components.
Hooks are functions that let you use React features in functional components
They allow you to use state and other React features without writing a class
Hooks provide a way to reuse stateful logic between components
Some commonly used hooks are useState, useEffect, and useContext
I applied via Company Website and was interviewed in Nov 2022. There were 2 interview rounds.
Var is function scoped, let is block scoped. Redux is a predictable state container, Flux is an architecture pattern.
Var can be redeclared and updated within its scope, let cannot be redeclared but can be updated within its scope
Redux has a single store for the entire application, while Flux has multiple stores
Redux uses a unidirectional data flow, while Flux uses a bidirectional data flow
Redux has middleware for handl...
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