Notes

--reverse the array of numbers or string without using any temp variable and reverse function
--Fibonacci series in O(n)
-- Find all unique pair of elements in an array with given sum in O(n)
-- Implement Promises in javascript
-- Implement the Promise.all and Promise.any
--Http vs Https, how https protects from attacks and name some of them
--Different types of cookies
--JWT token implementation and what all info it contains
--Cors
--reverse a string but leave the special character in between if any.
===================
alternative of promises other than callbacks if you can think of any
==================
- How to defer a continuous sync loop , such that any button can be clicked on DOM
-- Basically checking concept of event-loop in javascript
- Number of squares on a chess board
- Promise vs Callback
- Ways to optimize webpage
- Closure timer question

====================================
- Implement Native promise
- Concept of immutablity general and ReactJs
- React 15 vs React 16 Changes , in particular - getDerivedStateFromProps

====================================
Throttle & Debounce
Native Bind
PrimeNumber Optimised way
Box Model
Positioning
Balanced Binary Tree
Array Flattening
Find pair == sum
Hit any URL in the address bar. How the page loads.
===========================
REACT HOC
https://levelup.gitconnected.com/understanding-react-higher-order-components-by-example-95e8c47c8006

================
https://khan4019.github.io/front-end-Interview-Questions/sort.html
https://www.geeksforgeeks.org/find-subarray-with-given-sum/

service workers vs web workers
javascript injection in sql injection
Find common element in two array in 0(n)

how can we keep all 1's together and 0s together of a array where there are large number of 1's and 0's.

How can we find element index in an array where very large number of elements are there.You can say infinite elements are there.

proxy in ES6

================================
flattening of the array code?

finding remainder without using modulus operator.

GetDerived state in react 16.

Fragments in react
=========================
symbol in ES6

iterator and generator

Design patterns

module design pattern

how to privatise object properties when you are making a plugin so that no one can change it accidently

Jquery plugins do it some way

async and await

garbage collection in javascript //mark and sweep algorithm

1. ES6 all the features
2. call stack ,javascript execution
3.Why javascript is single threaded,what is process? what is thread?
if process is single then it will be mukti thtreaded or not?
If process is multithreded then what algo will be followed?
what is static in javasvcript and its uses?
normal contructor(inside class) type and function constructor?
classical inheritance vs protypical inheritance?


1.functional component stateful component and pure component
2.What is flux and redux?
3.react 16 features new ones?
4.what is the use of the key and we should not give array index as key?
5.HOC
6.How we can do state management in react without redux?
7.Context API-->> act as global object
8. get derived state
9.proxy inn javascript
10.debouncing and throttling

find a specific element in an infinite array.
find common element out of 5 arrays.

how can we keep all 1's together and 0s together of a
array where there are large number of 1's and 0's.

https://stackoverflow.com/questions/1606797/use-of-apply-with-new-operator-is-this-possible


finding duplicates element an array having numbers 0 to 9 in 0(n) without using any data structure .

A 2*2 matrix is there with rows and columns are sorted in ascending order.how can you find an element in and very optimal way?

Find number of overlapping meetings happening in meeting rooms.given array of object with each of object start time and end time and object being each meeting

write a function which can be called once after which it should return same value in each of the subsequent calls

compare two object if they are deep clones ones

object and array flatening

Implement _.get of lodash

DPR and sprite images