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Questions And Answer
How does React Work?
Ans:React is a library for building user interfaces.It converts JavaScript code to JSX(JavaScript XML) by the help of react package. It makes a vartual dom when users interact on the client site. React compares changes between real DOM and vartual DOM. And it update only the spacific changes on the Real DOM without reloading the webpage by the help of React DOM. As it works without reloading the page it is very fast and popular among the developers
What are the differences between props and state ?
- The Data is passed from one component to another.
- It is Immutable (cannot be modified).
- Props can be used with state and functional components.
- Props are used to pass data from one component to another.
Props
- The Data is passed within the component only.
- It is Mutable ( can be modified).
- State can be used only with the state components/class component (Before 16.0).
State
How does useState work?
Ans:useState is a Hook that allows developer to have state variables in functional components. It can store value, objects in an array. Use state is an array which has 2 elements. One is a start variable and other is a store function. The set function help developer to store the value on the state variable as an array for future uses.