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ArchivedArchived repositoryProgramming Languages

Chalarangelo/30-seconds-of-interviews

30 Seconds Of Interviews

A curated collection of common interview questions to help you prepare for your next interview.

12k stars964 forks105 entriesLast push Dec 9, 2022 (3 years ago)License MIT

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React docs on State and Lifecycle

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MDN docs for comparison operators

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React docs on Rendering Elements

React docs on Components and Props

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React docs on State and Lifecycle

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Official Web Docs Promise

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MDN docs for typeof

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MDN docs for Object.assign()

Clone an object in vanilla JS

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Object Equality in JavaScript

Deep comparison between two values

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Cross-Site Scripting Attack (XSS)

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An example of a cross-origin request is a web application served from

that uses AJAX to make a request for http://yourdomain.com.

MDN docs for CORS

In 2 lists

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MDN docs for DOM

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let vs const

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Event Delegation

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React docs on setState

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What is the difference between a statement and an expression?

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Truthy on MDN

Falsy on MDN

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Similar problem

Useful ES6 snippets that you can understand in 30 seconds or less.

In 4 listsDetails

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Similar problem

Useful ES6 snippets that you can understand in 30 seconds or less.

In 4 listsDetails

Fix "0.1 + 0.2 = 0.300000004" in JavaScript

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MDN docs for forEach

MDN docs for map

JavaScript — Map vs. ForEach

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JavaScript: What is short-circuit evaluation?

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MDN docs for hoisting

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MDN docs for hoisting

Understanding Hoisting in JavaScript

Detailed explanation of the concept of hoisting in JavaScript.

In 2 lists

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React docs on Handling Events

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MDN docs for closures

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Automatic semicolon insertion in JavaScript

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React docs on Conditional Rendering

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React docs on Lists and Keys

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MDN docs for closures

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JavaScript Value vs Reference

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MDN docs for inheritance and the prototype chain

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MIME Type MDN

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Master the JavaScript Interview: What is a Promise?

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MDN docs for data types and data structures

Understanding Data Types in JavaScript

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The Node.js Way Understanding Error-First Callbacks

What are the error conventions?

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MDN docs for callbacks

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MDN docs for null

MDN docs for undefined

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JavaScript Value vs Reference

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React docs on Handling Events

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React docs on Fragments

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What is function composition?

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Node.js docs on event loop, timers and process.nextTick()

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MDN docs for NaN

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Mutating vs non-mutating array methods

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Big O Notation in JavaScript

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Pure functions in JavaScript

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In plain English, what is recursion?

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Implementing memoization in JavaScript

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React docs on Refs and the DOM

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Declarative vs Imperative Programming

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Javascript and Functional Programming: An Introduction

Master the JavaScript Interview: What is Functional Programming?

A simple introduction by @ericelliott to functional principles and vocabulary.

In 2 lists

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React docs on Portals

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MDN docs on Events and Handlers

Understanding Node.js event-driven architecture

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React docs on Context

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Classes on MDN

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MDN docs for closures

What is a closure

I never understood JavaScript closures

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this on MDN

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React docs on Children

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React docs on Refs and the DOM

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Virtual DOM in Hyperapp

1kB-ish JavaScript framework for building hypertext applications

In 3 lists

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MDN docs for strict mode

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Avoiding Callback Hell in Node.js

Asynchronous JavaScript: From Callback Hell to Async and Await

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The difference between Virtual DOM and DOM

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React docs on Handling Events

React docs on Passing Functions to Components

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React docs on State and Lifecycle

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React docs on State and Lifecycle

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React docs on Rendering Elements

React docs on Components and Props

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React docs on Handling Events

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React docs on setState

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React docs on Handling Events

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React docs on Conditional Rendering

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React docs on Lists and Keys

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React docs on Refs and the DOM

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React docs on Fragments

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React docs on Handling Events

React docs on Passing Functions to Components

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https://reactjs.org/docs/error-boundaries.html

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React docs on Context

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React docs on Refs and the DOM

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React docs on Children

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React docs on Portals

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A good basis for accessibility

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Strategies for cache-busting CSS

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StackOverflow Using header or footer tag twice

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HTML 5 Semantic Elements

In 2 lists

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Open external anchors using rel="noopener"

About rel="noopener"

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async vs defer attributes

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React docs on Handling Events

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W3Schools docs for HTML and XHTML

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MDN docs for DOM

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HTML 5.2 WWW Specifications

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W3Schools HTML5 Webstorage

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Writing clean and maintainable CSS

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CSS Preprocessors

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MDN docs for basic concepts of flexbox

A complete guide to Flexbox

All you need to know about Flexbox on one page.

In 4 lists

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MDN docs for @media rule

MDN docs for using media queries

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W3School's CSS Box Model Page

Mozilla's Intro to the CSS Box Model

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CSS units for font-size: px | em | rem

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CSS Sprites explained by CSS Tricks

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W3School's CSS Combinators Page

Mozilla's Combinators and groups of selectors page

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CSS Specificity

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:focus-visible

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Web Content Accessibility Guidelines (WCAG) Overview

How to Meet WCAG

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WAI-ARIA Overview

WAI-ARIA Spec

Use WAI-Aria tags to help machines understand your code.

In 2 lists

ARIA Serious? Eric Eggert presentation

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Accessibility APIs

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ARIA Landmark Roles

Using ARIA landmarks to identify regions of a page

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The Node.js Way Understanding Error-First Callbacks

What are the error conventions?

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Avoiding Callback Hell in Node.js

Asynchronous JavaScript: From Callback Hell to Async and Await

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Node.js docs on event loop, timers and process.nextTick()

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Cross-Site Scripting Attack (XSS)

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