19 lines
1.1 KiB
Markdown
19 lines
1.1 KiB
Markdown
---
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title: Reselect
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---
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## Reselect
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Reselect is a simple selector library for Redux.
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Why do we need selectors? Official docs describe it this way:
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* Selectors can compute derived data, allowing Redux to store the minimal possible state.
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* Selectors are efficient. A selector is not recomputed unless one of its arguments changes.
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* Selectors are composable. They can be used as input to other selectors.
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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.
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#### More Information:
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<!-- Please add any articles you think might be helpful to read before writing the article -->
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* [reselect](https://github.com/reduxjs/reselect)
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* [React, Reselect and Redux](https://medium.com/@parkerdan/react-reselect-and-redux-b34017f8194c)
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