Why is mapStateToProps needed if I can use the entire store in my component?

Question

From definition

mapStateToProps is used for selecting the part of the data from the store that the connected component needs.

I didn't understand why do we even have to specify mapStateToProps if I can use the entire store data in my component, what exactly does mapStateToProps provides? What will happen if I select some part of data?

Any advantages?

Answer 1

• mapStateToProps gives you only the p arts of the store you need in the component.
• It calls every time the store state changes (every time the relative part of the store that you return is changed).
• It can return different structures of the store data
• Can return different structures of the store data for different component props.
• Can be re-used for different components that need the same parts of the store