Seasia Infotech Interview Questions, Process, and Tips

Hooks are a new feature in React 16.8 that allow you to use state and other React features without writing a class.

• Hooks are functions that let you use React state and lifecycle methods inside functional components

• They allow you to reuse stateful logic across multiple components

• useState is a hook that lets you add state to functional components

• useEffect is a hook that lets you use lifecycle methods in functional compon...read more

Use useState hook to manage state in functional components

• Import useState hook from React

• Declare state variable using useState hook

• Use state variable and setState function to update state

• Pass state variable and setState function as props to child components if needed

useEffect is a hook in React that allows performing side effects in functional components.

• useEffect is used to perform side effects in functional components.

• It takes two arguments: a function and an array of dependencies.

• The function is executed after every render cycle.

• The array of dependencies is used to specify when the effect should be re-executed.

• An empty array [] means the effect should only be executed once, on

Life cycle methods are functions that are invoked at various stages of a component's existence in React.Js.

• There are three categories of life cycle methods: mounting, updating, and unmounting.

• Mounting methods are called when a component is being created and inserted into the DOM.

• Updating methods are called when a component is being re-rendered due to changes in its props or state.

• Unmounting methods are called when a co...read more

Redux is a predictable state container for JavaScript apps.

• Redux is a library for managing application state.

• It provides a central store for all the state in an application.

• State changes are made through actions, which are dispatched to the store.

• Reducers are pure functions that take the current state and an action, and return the new state.

• Selectors are functions that extract data from the state.

• Middleware can be used...read more

Reducer is a pure function that takes the previous state and an action, and returns the new state in Redux.

• Reducers specify how the application's state changes in response to actions sent to the store.

• They are pure functions that take the previous state and an action, and return the new state.

• Reducers should not modify the previous state, but return a new object if the state changes.

• Redux uses a single root reducer fun...read more