New Arts Commerce Science College Interview Questions and Answers

Context API in React is a way to pass data through the component tree without having to pass props down manually at every level.

• Context API provides a way to share values like themes, user data, etc. across the component tree without having to pass props down manually.

• It consists of three main parts: Provider, Consumer, and useContext hook.

• Provider component allows the data to be passed down to the tree, Consumer component consumes the data, and useContext hook allows functio...read more

Redux is a predictable state container for JavaScript apps, commonly used with React for managing application state.

• Redux helps manage the state of an application in a predictable way

• It provides a single source of truth for the state of the application

• Actions are dispatched to update the state in a predictable manner

• Reducers specify how the state changes in response to actions

• Redux is commonly used with React to manage the state of components

Count duplicates in an int array

• Create a HashMap to store the count of each element in the array

• Iterate through the array and update the count in the HashMap

• Count the elements with count greater than 1 as duplicates