Price: 100000
Price: 85000
Price: 62000
Price: 55000
Price: 43000
Price: 52000
Price: 30000
Price: 49000
Price: 70000
Answer: React is a library that helps you build user interfaces. It is declarative, which means that you describe the UI as a declarative list of components. React components are reusable, which means that you can write code once and use it on many different pages. When an update is needed in the UI, only the component that is tasked for that specific update needs to be called.React makes it painless to create interactive UIs.
| Number | Props | State |
|---|---|---|
| 1 | Props are Immutable. | State is mutable. |
| 2 | Used to passed data from parent to child. | Used within the component (limited to current component) |
| 3 | Used to pass data as well as callback functions as props. | Initialize within constructor |
| 4 | Can get initialize from parent component and can be changed from a parent component | Used “this.setState” to update object. |
| 5 | Can set initialize the value for child component and can be changed in the child component | Can set initialize the value for child component and can be changed in the child component |
The useState() is a Hook that allows you to have state variables in functional components. useEffect runs after every render (by default), and can optionally clean up for itself before it runs again. To create a functional component and throw some React hook at it that tracks state, can also update it, and it just works. That was a lot to process and this is just a very simplistic approach to useState.