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JavaScript Interview Questions

Q1: Explain equality in JavaScript ☆

Answer: JavaScript has both strict and type–converting comparisons:

  • Strict comparison (e.g., ===) checks for value equality without allowing coercion
  • Abstract comparison (e.g. ==) checks for value equality with coercion allowed

Interview Questions

MongoDB

Q1: Explain what is MongoDB? ☆

Answer: MongoDB is an open-source document database that provides high performance, high availability, and automatic scaling. It's Key Features are:

  • Document Oriented and NoSQL database.

Interview Questions

Node.js

Q1: What do you mean by Asynchronous API? ☆☆

Answer: All APIs of Node.js library are aynchronous that is non-blocking. It essentially means a Node.js based server never waits for a API to return data. Server moves to next API after calling it and a notification mechanism of Events of Node.js helps server to get response from the previous API call.

Source: tutorialspoint.com

@bradtraversy
bradtraversy / mongodb_cheat_sheet.md
Last active February 28, 2025 18:32
MongoDB Cheat Sheet

MongoDB Cheat Sheet

Show All Databases

show dbs

Show Current Database

@cdiggins
cdiggins / react-best-practices.md
Created January 25, 2018 16:20
React Best Practices
@delibytes
delibytes / react-cheatsheet.md
Last active February 19, 2024 18:06
React & JSX Cheatsheet

React & JSX Cheatsheet

Overview
JSX HTML <div>...</div>
JSX Component <Component property={javascript} />
<Component property='string' />
JSX Component with Children <Component>{children}</Component>
reference: props.children
Escaping JavaScript {...}
require statements const React = require('react');
const ReactDOM = require('react-dom');
npm modules react, react-dom
@int128
int128 / README.md
Last active December 18, 2024 08:48
Watching build mode on Create React App

Create React App does not provide watching build mode oficially (#1070).

This script provides watching build mode for an external tool such as Chrome Extensions or Firebase app.

How to Use

Create a React app.

Put the script into scripts/watch.js.

@bvaughn
bvaughn / react-lifecycle-cheatsheet.md
Last active October 8, 2024 15:46
React lifecycle cheatsheet

React lifecycle cheatsheet

Method Side effects1 State updates2 Example uses
Mounting
componentWillMount Constructor equivalent for createClass
render Create and return element(s)
componentDidMount DOM manipulations, network requests, etc.
Updating
componentWillReceiveProps Update state based on changed props
@augbog
augbog / Free O'Reilly Books.md
Last active February 26, 2025 12:50
Free O'Reilly Books

Free O'Reilly books and convenient script to just download them.

Thanks /u/FallenAege/ and /u/ShPavel/ from this Reddit post

How to use:

  1. Take the download.sh file and put it into a directory where you want the files to be saved.
  2. cd into the directory and make sure that it has executable permissions (chmod +x download.sh should do it)
  3. Run ./download.sh and wee there it goes. Also if you do not want all the files, just simply comment the ones you do not want.
@vasanthk
vasanthk / System Design.md
Last active March 13, 2025 21:04
System Design Cheatsheet

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

  1. Clarify and agree on the scope of the system
  • User cases (description of sequences of events that, taken together, lead to a system doing something useful)
    • Who is going to use it?
    • How are they going to use it?