What’s inside React components?

At the heart of React are key elements called “components”. These components represent a DOM node and each component has its own state and properties (props). Understanding these concepts will help you better understand how to use React effectively.

How would you define the React state?

This is a way for React to remember values from inside a component. For example, the variables that are initialized at the root of a function.

When you use props over state?

Props are a way to pass data or functions to a React component. They can be used when the data is immutable (Not to change). Only The component will tell how the passed props (data) will be displayed.

When you use state over props?

You use state when you need to change the passed data and make some operations before you output it for a display. You also use state when you want to keep the values from your components within that component.

Does props and state “Immutable“?

The props are immutable, meaning they shouldn’t be changed once passed from the component. The state isn't, because they're like the variables you declared inside a function. You need to process it with more operations before the function returns its value.