CODE FIT PRO

1 how react works ,virtual dom , source map

 useDebounce Hook react synthetic events useMemo and useCallback When to use an interface and when to use a type optimising an app When to use context and when to use Redux axios interceptor, http interceptopr axios middleware, useQuery redux, thunk and saga code review criteria, how will you code review

  // console.log(1)  //1 // let promise= new Promise((resolve,reject)=>{ //   console.log(2) //   setTimeout(() => { // console.log(12) //     resolve('foo'); //   }, 10);  // }) // console.log(3) //3  // promise // .then(data=>{ //         console.log(4,data) // }) // .catch(data=>{ //         console.log(5,data) // }) // console.log(7) // setTimeout(()=>{ // console.log(6) // },0) // //macro --6, (foo12) // //1 // //3 // //7 // //2-->  // //6 // //12 // //4 ,foo //Question: Given an array of integers, find two numbers such that they add up to a specific target value. Implement the function and optimize it for time complexity. // nums = [ 7, 11, 15,5] // target = 7 // //output: [0,1] // let map =new Map(); // // { } // for(let i=0;i<nums.length;i++){ //   let varFind = target-nums[i];    //   if(map.has(varFind)){ //...

 // a=10 // b=20   // const temp = a;  https://github.com/sudheerj/reactjs-interview-questions // a = b; // b = temp;//10   // a = a + b; //30 // b = a - b; //10 // a = a - b;//20   // [a, b] = [b, a]; // console.log(a,b) console.log(a,b) //life cycle method in react -->class based component //render props //hoc //automatic batching //what is call stack, how does the call stack //how the virtual dom is working //how the call stack is working //what is fiber algo //what is reconciliation Please go through these topics Call stack VIrtual Dom FIber Algorithm https://codesandbox.io/p/sandbox/clever-diffie-nqhck7 factory function fiber vs old reconciliation const length = 4; const numbers = []; for (var i = 0; i < length; i++); {   numbers.push(i + 1); } console.log(numbers); es6 const scores = [22, 33]const [math = 50, sci = 50, arts = 50] = scores   https://devhints.io/es6   pROMISE const data = [   {     id: 1,   ...

 //let const  //promises //Symbol //class //?? //EVENT LOOP //mircro --> promises --> fetch //macro/callback --> setTimeout(function() {}, 10); /** componentDidMo --> [] comonp ->[] timerID = setTimeout() return ()=>{    } */ //errorhandling--> componentdidcatch //dispatch --> token  //createAsyncThunk  //dispatch -->  //middleware  //react-router-dom //react-testing-library  //webdriver.io --> e2e //pipeline  //axios //enum name = unknown any  //eslint -->consle.log()  //eslintconfig --> //senorconfig in project //img load='lazy'  //webpack -->configuration //--> deep 

Previous project flow Technologies which u used react js optimisation techniques life cycle methods Useeffect where will use Usecontext api Redux vs contextapi diff Axios vs fetch diff Async vs promise Javascript - let var const diff Closer with example Es6 features HTML- symmetric vs non symmetric Grid vs flex Media query Node js basic questions SQL queries Aws lambda workflow