React JS interview 2023 Live Coding Round (Mock)

Подписаться 81 тыс.

Просмотров 298 тыс.

50% 1

Never faced React JS live coding round? You can experience React JS Interview Live coding round where a candidate is asked to build a UI component. #reactjs #javascript #interview #mockinterview
🤯 Crash Courses (Single Video)
Git/Github Crash Course : bit.ly/3JSA5VT
TypeScript Crash Course : bit.ly/372dZSh
Angular Crash Course : bit.ly/3DoGJR1
Vue JS Crash Course : bit.ly/3uDujRl
Python Crash Course : bit.ly/3Dod7U2
React Router Crash Course : bit.ly/36YfO2i
🧑‍🏫 Full Course Playlists
HTML : bit.ly/36IMq0h
CSS : bit.ly/3LpRQw6
JavaScript : bit.ly/3u049tf
BootStrap : bit.ly/3NA9nDJ
ES 6 : bit.ly/3DvYCh6
DOM Playlist : bit.ly/35nMKB7
ReactJS (Redux & Hooks) : bit.ly/3iMethN
React with TypeScript : bit.ly/3fQjXtF
React Hooks: bit.ly/3Vmh7wV
Redux: bit.ly/3yAIIkl
NodeJS/ExpressJS : bit.ly/35nN6Yt
MongoDB / Mongoose : bit.ly/3qPj0EO
💻 Projects Playlists
MERN Stack Complete Ecommerce : bit.ly/3ymSs0E
Web Design HTML+CSS - Home Page : bit.ly/35nZiIB
Web Design BootStrap - E-Commerce Site : bit.ly/3iPhaz7
React/Redux/Firebase - Todo-App : bit.ly/3DnekL8
🕹 Mini Projects (Single Video)
React - Tic Tac Toe (Redux / Hooks) : bit.ly/3uzLEuy
React - Game of Flag Quiz (Hooks) : bit.ly/3LpTC0e
React - Google Translate Clone (Hooks) : bit.ly/3Lo9xvZ
React - Chat App using Firebase (Hooks) : bit.ly/3wLgymj
Visit our site: coderdost.com
🔴 Full Courses List : coderdost.com/...
🔴 Full Projects List : coderdost.com/...
💾 Source Codes at : github.com/cod...

Опубликовано:

5 окт 2024

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 134

@prakashbanjade4374 Год назад

The simple approach is that you can create another component for your list-item and in that component declare the isChecked state.

@aniket-in Год назад

Exactly, that way the logic is separeted, and I think's that's one of the main reason of using React.

@bishwajeetpandey1570 Год назад

@@aniket-in can you please share the code on this logic

@anshulvairagade1604 Год назад

@@bishwajeetpandey1570 import { useState } from "react"; import List from './List' const App = ()=>{ const arr = ['play games', 'read book', 'play chess'] const [arr1, setArr1] = useState(arr) const handleDelete = (idx)=>{ setArr1(arr1.filter((item, i)=> i!==idx)) } return ( { arr1.map((item, idx)=>( handleDelete(idx)} item={item}/> )) } ) } export default App; import { useState } from "react"; const List = ({onDelete, item})=>{ const [checked, isChecked] = useState(false) return ( < input type="checkbox" checked={checked} onChange={(e)=>isChecked(e.target.checked)} /> {item} { checked && X } ) } export default List;

@bishwajeetpandey1570 Год назад

@@anshulvairagade1604 every thing is seems readable and fine but why u passed item prop from App component to list component

@anshulvairagade1604 Год назад

@@bishwajeetpandey1570 item means the element of our array, and that arrar is present in App component, and we are using that particular element and printing it using another list component. To add more logic into it i.e adding check box etc I hope this helps

@bishwajeetpandey1570 Год назад

This is my solution of this problem import { useState } from "react"; const arr=["Apple", "Orange", "Banana"] export default function App() { const [fruitsArr, setFruitsArr] = useState([...arr]); const [chkBoxStates, setChkBoxStates] = useState(arr.map(()=>false)); const deleteClickHandler = (index) => { alert(index); const filteredArr = []; for (let i = 0; i < fruitsArr.length; i++) { if (i !== index) filteredArr.push(fruitsArr[i]); } setFruitsArr(filteredArr); }; const handleCheck = (isChecked, index) => { setChkBoxStates((prevArray) => { const newArray = [...prevArray]; // create a new array based on the previous state array newArray[index] = isChecked; // modify the element at the specified index return newArray; // return the new array as the updated state value }); }; return ( {console.log("render")} Hello Codeandbox Start editing to see some magic happen! {fruitsArr.map((element, index) => { return ( handleCheck(e.target.checked, index)} >{" "}    {element}          {chkBoxStates[index] && ( deleteClickHandler(index)}>Delete )} ); })} ); }

@webber5629 Год назад

But the problem is when i click the checkbox for first item then it's delete button shows and after deleting that item the checkbox for second item is automatically checked and so on.

@pankajpundir6256 Год назад

To implement this task first you will have to add ischeck key inside the copyarr through map and then pass index and target value through handlechnage function .arr[index] ={..arr[index], ischeck=!arr[index].ischeck !ischeck} and then you make a condition inside the jsx that ischeck==true && Delete

@lipinkariappa3550 Год назад

i haven't learnt react yet, but ig a simple vanilla js script for deleting part would be this: const buttons = document.querySelectorAll('li button') buttons.forEach((button)=>{ button.addEventListener('click',(event)=>{ event.target.parentNode.remove() }) })

@pranshukumar6707 2 месяца назад

For checkboxes we can create an state which will be an array of all the selected boxex item index... This array will be manipulated upon clicking on the checkbox.. Checkbox unchecks and checks itself.. No need to keep a checkbox status in this case.. Now upon clicking a checkbox pass the index of item.. Now check whether the checkbox array state contains that index or not (by using arr.includes (index)).. If yes.. Then splice that index.. If no then push the index in that array.. This way we will always have an array of items index for which checkbox is selected.. Based on that we can do conditional rendering of delete button..

@anshulbhorde7712 Год назад

export default function App() { const [data, setData] = useState(["A", "B", "C"]); return data.map((label, i) => ( setData(data.filter((name) => label !== name))} key={label} label={label} /> )); } function Root({ label, onDelete }) { const [checked, setChecked] = useState(false); return ( setChecked(e.target.checked)} type="checkbox" /> {label} {checked && delete} ); }

@supriyasaha5234 Год назад

Awesome 😍

@pratiksavaliya3890 Год назад

create child component for each item and manage check state inside that component for each individual list item.

@vaskarchandradas3565 Год назад

❤U r right brother😊

@shayanalijalbani9894 Год назад

You can create a one sate like: const [checkedInputs, setCheckedInputs] = useState([]); And then add the current index + checkedInputs to checkedInputs state like setCheckedInputs([... checkedInputs, index])

@vinothkumarv9722 Год назад

Well he is tried nicely very good :)

@rizkydjanuar2809 Год назад

Easy to solve, u can create a component that return a state(it`s called children as a function or if u familiar with callback is same method). Then u can use it after mapping so u create a seperate state and then u can use it to handle show delete button

@rizkydjanuar2809 Год назад

import React, { useState } from "react"; const hobbies = [ { id: 1, nama: "Main gitar", }, { id: 2, nama: "Nonton", }, { id: 3, nama: "Main Game", }, ]; type CheckboxProps = { checked: boolean; setChecked: React.Dispatch; }; type WrapperCheckboxProps = { children: (props: CheckboxProps) => React.ReactNode; }; const WrapperCheckbox: React.FC = ({ children }) => { const [checked, setChecked] = useState(false); return {children({ checked, setChecked })}; }; function App() { const [newArr, setNewArr] = useState(hobbies); const handleDelete = (id: number) => () => { const newFilteredArr = newArr.filter((val) => val.id !== id); setNewArr(newFilteredArr); }; return ( Hobbies {newArr.map((el) => ( {({ checked, setChecked }) => ( {el.nama} setChecked(e.target.checked)} /> {checked && Delete} )} ))} ); } export default App; my solution

@amitsahgal2000 Год назад

@@rizkydjanuar2809 u made it 100 times complex

@mdreadwan2791 8 дней назад

In My Solution, I transform the the initial arr into array of object using map, import { useState } from 'react'; const tasksArray = ['Play Cricket', 'Walk Around', 'Read Books']; const App2 = () => { const initialTasks = tasksArray.map((task) => ({ name: task, isChecked: false, })); const [tasks, setTasks] = useState(initialTasks); const handleDelete = (taskName) => { const remainingTasks = tasks.filter((task) => task.name !== taskName); setTasks(remainingTasks); }; const handleCheckChange = (index, e) => { const updatedTasks = [...tasks]; updatedTasks[index].isChecked = e.target.checked; setTasks(updatedTasks); }; return ( App 2 {tasks.map((task, index) => ( handleCheckChange(index, e)} /> {task.name}{' '} {task.isChecked && ( handleDelete(task.name)} > (X) )} ))} ); }; export default App2;

@subhajit3316 Год назад

He has lifted the state up i.e state controlled by parent that why when he click another checkbox check become false and button disappeard The solution is that he has to create diff state for diff children

@galax5130 Год назад

check could be a object or object of arr assign to check state when bool and index were saved and then access the obj according to it.

@bardenishi4312 Год назад

Amazing..... what the helpful video you are making!

@anirbandas12 4 месяца назад

delete an elem from arr .. let's use filter .. yeah .. if an item is at the last position we need to iterate the whole array and filter ... hmm.. very efficient

@WeakCoder Год назад

Sir, should we expect these kind of questions for a 2 yrs exp IT person ? Or much harder than this ?

@coderdost Год назад

if someone is taking a live interview you can expect a similar level. But otherwise a little more harder will be there. Live meaning someone checking while you are coding... but sometime they just given questions and expect you to submit in 2 hours etc. Then it will be much harder.

@kt3030 9 месяцев назад

These questions can asked for fresher ?@@coderdost

@abnow1998 Год назад

I would have used useReducer Hook to handle checkbox value for that particular input and trigger delete if selected. Simple!!

@freentechcoder 8 месяцев назад

Lets Try to Correct His Logic import { useState, useEffect } from "react"; import "./styles.css"; const test = ["1", "2", "3"]; export default function App() { const [arrcopy, setArrCopy] = useState(test); const [checkboxArr, setCheckBoxArr] = useState( Array(test.length).fill(false) ); const HandleChecbox = (isChecked, Iteam) => { setCheckBoxArr((prevCheckboxArr) => { const newArr = [...prevCheckboxArr]; newArr[Iteam] = isChecked; return newArr; }); console.log(checkboxArr); }; const handleDlete = (ItemIndex) => { let newArr = arrcopy; let filterarray = newArr.filter((item, index) => { return index !== ItemIndex; }); setArrCopy(filterarray); }; return ( Hello CodeSandbox Start editing to see some magic happen! {arrcopy.map((item, index) => { return ( HandleChecbox(e.target.checked, index)} /> {item} {checkboxArr[index] && ( handleDlete(index)}>DeleteButton )} ); })} ); }

@chillpill610 Год назад

pl. continue this series , upload videos weekly , help many aspirants

@Yadavladka108 4 месяца назад

@Hitesh Choudhary , best teacher 🎉🎉 thank you sir.

@Kakashi-ek1ju Год назад

How much salary a guy can expect from this level of interview

@parshvsheth-rj2vq 2 месяца назад

Internship

@proeditz108 10 месяцев назад

He can create an another component for every list item and pass the props for every single list item. Thanks.... 😂😂❤❤

@mitulbhadeshiya480 Год назад

Thanks for such a good tutorial

@purusharma8192 Год назад

Sir your videos are very useful and you also remains cool and calm

@anubhav.codess 10 месяцев назад

Delete can be done with the help of splice

@bishwajeetpandey1570 Год назад

Wow upload more videos on interview coding round.

@bekizodcancer3657 10 месяцев назад

in order to render the updated list when the delete button click why not we can use useState hook for the arr array list...any suggestion?

@ByteSights Год назад

Just use input type checkbox and label

@aveenism 11 месяцев назад

is it for fresher or how many experienced level question

@sharoonps4285 Год назад

Sir how i can I build logic in react 😊..some one help me

@nk-bq6xy 11 месяцев назад

Sir, from were can i get this type of questions

@sagarmehta9624 Год назад

You can use bubbling here

@tech.corner Год назад

Amazing..

@shailenderjaiswal1685 Год назад

this is very nice

@VishalSharma-rn7mt 10 месяцев назад

Awesome

@shaileshmadav4538 Год назад

const [check, setCheck] = useState({}) const handleCheckBox = (index, e) => { setCheck(preValue => ({...preValue, [index]: e.target.checked})) }

@blackpurple9163 Год назад

Interview me ese hi questions puchhte he kya? For freshers? I'm applying for MERN stack

@coderdost Год назад

They may ask simple conceptual questions also as given in this playlist : ru-vid.com/group/PL2PkZdv6p7ZnxpstmVUbybt5M9hjTayY_ These type of questions are asked in companies which take some time to evaluate candidates for React skill - otherwise they may ask even plain programming question or DS question. There is no set rule

@yikanaveen Год назад

Sir , i'm doing BBA from regular private college and I have skill in MySQL ,php, javascript,html , css so can I get job in it sector? Please tell me

@coderdost Год назад

PHP is still used but competition is high, from old developers. You will have to try with some internships at a company where they use PHP or some PHP based framework. Laravel is top framework these days. PHP is not high paying initially, but it is a widely used language still.

@yikanaveen Год назад

@@coderdost sir i know i asking that i am BBA student so can i get jobs in it sector if i had THAT skills

@4444-c4s Год назад

@@yikanaveen kyu nahi...companies ko bus skills chahiye...Projects banao aur dikhaao

@coderdost Год назад

@@yikanaveen Yes, however your first job will be hard to crack in traditional IT companies which filter based on degreee and field. So you have to try for startups and companies which are remote work based and looking for skills rather than background of degree. After first job, things change.. and experience matters.

@onething...4866 Год назад

why you not complete the answer ?

@coderdost Год назад

candidate only coded till that point

@NavneetTaneja-d1y Год назад

he did in very complicated way

@NavneetTaneja-d1y Год назад

input pain click nahi change event lagta hain

@vivekkumar-pc1xy Год назад

thanks, very informative video

@swapnaar5329 Год назад

Hi Vivek, do you know any telugu reactjs developers or full stack developers in india? Please let me know if they need any extra income.

@anuragtiwari6910 Год назад

please share codesanbox link of such mocks

@coderdost Год назад

codesandbox.io/s/long-leaf-pwxu4i

@sui16chillax75 Год назад

very simple question, god did it very first try , so i think god is god always right

@satyaranjanbehera Год назад

for reactjs coding from where to prepare?

@coderdost Год назад

I think there is no good question sets available. generally better to work on some small projects. that itself is a good practice.

@jeth2600 Год назад

I want to know about that it's scripted or not. Or The student already know the question.

@coderdost Год назад

No student is joining live

@jeth2600 Год назад

@@coderdost TQ for reply And he can use Google.

@karanbhoite9552 Год назад

Experience???

@coderdost Год назад

Fresher

@roxxxxxy Год назад

chatgpt be like: bas itna hi abhi kar deta hu

@coderdost Год назад

🤣

@shayanalijalbani9894 Год назад

It's a good practice to create a state like const [state, setState] = useState() And not like this const [state, setName] = useState()

@iamdevil9485 Год назад

which software is he using?

@coderdost Год назад

Online code editor. Syncfiddle

@mayankmisra00 Год назад

hi sir can you give the solution of that problem ? function sayHello(){ console.log("Hello"); } function sayHi(){ console.log("sayHi") } function add(a,b,fun){ sayHello() sayHi(10) console.log(a+b) } add(10,20,sayHello) here i can call the sayHi() fuction in the add function()

@jayeshmahajan4213 Год назад

i guess sayhi() fun no console any value because its not access in fun add

@nitishgupta8393 Год назад

my solution: import "./styles.css"; import { useState } from "react"; export default function App() { const arrInp = [ { id: 1, item: "task1" }, { id: 2, item: "task2" }, { id: 3, item: "task3" }, { id: 4, item: "task4" } ]; const [completed, setCompleted] = useState([]); const [arr, setArr] = useState(arrInp) const handleCheck = (e, id) => { if (e.target.checked && !completed.includes(id)) { setCompleted([...completed, id]); } else { let ind = completed.indexOf(id); let newArr = [...completed]; newArr.splice(ind, 1); setCompleted(newArr); } }; const deleteTask = (id)=> { let temp = [...arr].filter(it => it.id!==id) console.log(temp) setArr(temp) } return ( {arr.map(({ id, item }) => { return ( handleCheck(e, id)} type="checkbox" /> {item} {completed.find((task_id) => task_id === id) && ( deleteTask(id)}>Delete )} ); })} ); } //

@hitman5161 Год назад

How can i give the mock interview to you

@coderdost Год назад

Generally we release a form on channel community

@gorikhanna6070 Год назад

@@coderdostcan u plz tell me how to give mock interview to u ???

@coderdost Год назад

@@gorikhanna6070 We put up a from on community post for mock interviews. you can apply once that is available.

@harrycullen863 Год назад

Is this for freshers or experience

@coderdost Год назад

Freshers. But for some for experienced dev also they ask simple question initially and then ask to add something to it.. live interviews …dont have very hard questions .. hard ones are given in take home assignments or machine round without a live interviewer

@mauliingle8322 9 месяцев назад

chai aur code

@jayanth9445 Год назад

@sarojregmi200 Год назад

will it be considered a pass ??

@coderdost Год назад

Depends on post, for fresher level it is PASS. as only few ppl can really code in live situation and limited time.

@zaneyt3791 Год назад

It's easy for me

@shreyanshmishra6613 Год назад

Do it without react with vanilla js

@zaneyt3791 Год назад

@@shreyanshmishra6613 for sure brother

@stan1slav937 Год назад

Wow, so basic problem and he cant resolve it , very weak guy

@coderdost Год назад

live coding makes people nervous, specially when other person is looking every second.

@rathore_shantilal Год назад

const [showDelete, setShowDelete] = useState([]); const handleCheckbox = (value, todo) => { showDelete.includes(todo) ? setShowDelete(showDelete.filter((item) => item !== todo)) : setShowDelete([...showDelete, todo]); }; handleCheckbox(e.target.checked, todo)} /> {showDelete.includes(todo) ? ( handleDeleteTodo(index)}>Delete ) : null}

@sandeepgaur98223 Год назад

can you please explain handleCheckbox code

@rathore_shantilal Год назад

@@sandeepgaur98223 I have maintained a state named "showDelete" which contain array of todo. Now how it worked : Whenever user click on checkbox , handleCheckbox will be triggered and in this function I have passed value (checked state which is further not used in function definition) and another is todo which are using in function definition . So showDelete.includes(todo) this line checked that current todo is present in state or not , if yes then we are filtering it and if not then we are adding it due to this We are using further this state to show Delete button corresponding to checkbox on the basis of corresponding todo is present in that state or not. Hope it is clear?

@sandeepgaur98223 Год назад

@@rathore_shantilal Thanks! It was indeed a very clear and to the point explanation!

@markanthonypandac2469 Год назад

heres my answer to this problem function List() { const todos = [ { label: "Magkaon", id: 1, isDone: false }, { label: "Maglung-ag", id: 2, isDone: false }, { label: "Manotbrush", id: 3, isDone: false }, { label: "Maglutog sud an", id: 4, isDone: false } ]; const [lists, setLists] = useState(todos); const handleClick = (id) => { const updatedLists = lists.filter(list => { return list.id !== id; }); setLists(updatedLists); } const handleChange = (id) => { const updatedLists = lists.map(list => { if(list.id === id){ return { ...list, isDone: !list.isDone } } return list }); console.log(updatedLists) setLists(updatedLists); } const renderedLists = lists.map(list => { return( handleChange(list.id)} checked={list.isDone} /> {list.label} {list.isDone && handleClick(list.id)}>Remove} ); }); return( {renderedLists} ); }

@markanthonypandac2469 Год назад

excuse my bisaya. lol