1.1 KiB
1.1 KiB
| title |
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| Reselect |
Reselect
Reselect is a simple selector library for Redux. Why do we need selectors? Official docs describe it this way:
- Selectors can compute derived data, allowing Redux to store the minimal possible state.
- Selectors are efficient. A selector is not recomputed unless one of its arguments changes.
- Selectors are composable. They can be used as input to other selectors.
It might sound complicated but selectors allow your app to work faster by reducing unnecessary rerendering(s). Normally mapStateToProps is called every single time any change in store is made. React-redux's "connect" function uses a mapStateToProps function argument to specify which store values to pass to the connected react component as props. Until you use PureComponents it might cause component being rerendered although it's not required.