Escada Interview Questions and Answers

Yes, I can write code for authentication using JWT.

• Generate a JWT token upon successful login

• Verify the JWT token on subsequent requests

• Set expiration time for JWT tokens to enhance security

Increment counter using Redux store in Mern Full Stack Developer interview

• Create a Redux action to increment the counter

• Define a Redux reducer to handle the action and update the state

• Connect the component to the Redux store and dispatch the action

useMemo is used to memoize a value, while useCallback is used to memoize a function.

• useMemo is used to memoize a value and recompute it only when its dependencies change.

• useCallback is used to memoize a function and recompute it only when its dependencies change.

• Example: useMemo can be used to memoize the result of a costly computation, while useCallback can be used to memoize a callback function passed to a child component.

No, Node.js is single-threaded.

• Node.js uses an event-driven, non-blocking I/O model which makes it single-threaded.

• It utilizes the event loop to handle multiple requests efficiently.

• However, Node.js can still leverage multi-core systems by spawning child processes.

Slice is a method that returns a shallow copy of a portion of an array into a new array, while splice is a method that changes the contents of an array by removing or replacing existing elements.

• Slice does not modify the original array, while splice does.

• Slice takes two arguments - start and end index, while splice takes three arguments - start index, number of elements to remove, and optional elements to add.

• Example: const arr = [1, 2, 3, 4, 5]; arr.slice(1, 3) returns [2, 3...read more

Event loop is a mechanism in JavaScript that allows for asynchronous operations to be executed in a non-blocking way.

• Event loop is responsible for handling asynchronous operations in JavaScript.

• It allows for non-blocking execution of code by continuously checking the call stack and the callback queue.

• Event loop processes tasks in a queue and executes them one by one.

• Example: setTimeout() function in JavaScript uses event loop to schedule the execution of a function after a sp...read more

Flow of redux store involves actions being dispatched, reducers updating the state, and components subscribing to the updated state.

• Actions are dispatched by components or middleware

• Reducers receive the actions and update the state immutably

• Components subscribe to the updated state using mapStateToProps

Code to remove duplicates from list without using set

• Iterate through the list and compare each element with the rest of the elements

• If a duplicate is found, remove it from the list