useState()

With the help of useState hook we can have state variables in a functional component. It takes an initial value as an argument and returns an array with current state value and a function to update this value.

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Components are reusable pieces of code that return HTML elements.

Props are the arguments passed into a component.

State is a value that belongs to a component.

props are passed from component to component.

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• State in Class Component

• State in Functional Component

• Updating state in nested object