Junior React Interview Questions (UK)

In this video we talk about the junior React interview questions I've had and talk about how you can get the most out of your junior react interview and what the common questions are.

How I learnt React

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Quiz

1) a===b means that a and b are equal in both value and type.
a==b means that they are equal in value only.

2) A closure is the combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment). ... In JavaScript, closures are created every time a function is created, at function creation time.

https://medium.com/dailyjs/i-never-understood-javascript-closures-9663703368e8

3)A promise is an object that may produce a single value some time in the future : either a resolved value, or a reason that it's not resolved

4)The JavaScript this keyword refers to the object it belongs to. You can set it with bind() among others.

5) SASS gives you access to variables and functions in CSS. Also it has a compiler that helps with debugging and you can nest classes.

6) Undefined means a variable has been initialised but not been assigned a value;
//var initilised
let a;
//this log will give undefined
console.log(a)

null is an assignment

//var initialised and assigned to null
let a = null;
//log will give null
console.log(a)

7) The 403 status code, or a Forbidden error, means that the user made a valid request but the server is refusing to serve the request, due to a lack of permission to access the requested resource.

8) A virtual DOM is a lightweight JavaScript representation of the DOM used in declarative web frameworks such as React, Vue.js, and Elm. Updating the virtual DOM is comparatively faster than updating the actual DOM, since nothing has to be rendered onto the screen.

React Router

https://www.youtube.com/watch?v=Law7wfdg_ls&ab_channel=DevEd