ajayjhaDev

Frontend Engineering
  https://codeshare.io/XLlwbj
  https://codeshare.io/1VbgEq
  https://codeshare.io/VN3OoO


Digital Marketing Agency Services
 https://codeshare.io/Yz77bQ
 

ajayjhaDev

1. Problem solving round (dsa or javascript related)  
2. Machine coding round or UI Task (either in vanilla JavaScript or React)
3. Theoretical questions on JavaScript, react, next, typescript, web fundamentals, css and html
4. System design (Not to be expert but at least have basic knowledge)




react challenges 
coding challenges (array, string ....etc)

ajayjhaDev

The useRef Hook allows to persist values between renders.
It store a mutable value that does not cause a re-render when updated.

It is used to access a DOM element.

// Use useRef to keep track of previous state values:
// https://www.w3schools.com/react/showreact.asp?filename=demo2_react_useref3

ajayjhaDev

what are semantic tags 
  - The semantic tags help the search engines and other user devices to determine the importance and context of web pages. 
    these are more readability tags like header section main nav footer article aside etc.
 
diff b/w HTML4 and HTML5
  - HTML4 has fewer elements, tags, and attributes compared to HTML5.
  
how to select nth element in nested element
  - using :nth-child()
  

ajayjhaDev

What is Node Js 
It's a JavaScript runtime environment which allows us to run JS code on our operating system or basically out side the browser.

what are the components of NodeJs design pattern
JS world, V8, bindings, c++(libuv) etc..

NodeJs is a singlethreaded or multithreaded
It's singlethreaded and multithreaded as well , actully It's depends upon What task we are performing in nodejs
like if we are writing simple JS code like for loop or any if statement then it's a single thread and 
if we are reading file or writing file using file system module then it's multithread.

ajayjhaDev

<!-----------Closure------------>

function foo(a){
  
  let x = a + 10;

  return function(){
    
    return 5 + x;

ajayjhaDev

// total space complexity (TS) = auxillary space complexity (AS) (Algorithmic complexity)+input space compelxexity (IS)

function foo(arr){

  // O(1);
let sum=0  // 1

  for(let i=0;i<arr.length;i++){
    let temp=arr[i];  // O(1)
    sum=temp;

ajayjhaDev

what is react 
react is a JavaScript library use to build Single-page application

why we use react js instead of angular or any farmework  or what are the Features of React.js
because of it's features

use JSX, - JSX allows us to write HTML elements in JavaScript.

Virtual DOM - Virtual DOM is like a lightweight copy of the Real DOM,

ajayjhaDev

OOPs..........................................................................................................

Different ways to create an Object

what is prototype 
prototype is an object which associate with all the functions and objects in JavaScript by default.

what is prototype chain 
whenever we are going to create an object , that object associate with the JavaScript default Object (that is prototype) ,