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Daishi Kato
Daishi Kato

Posted on • Originally published at

Redux-less context-based useSelector hook that has same performance as React-Redux

Super easy useTrackedState hook is also recommended


React-Redux provides hooks API
with nice abstraction. Especially, useSelector is probaly less misused than mapStateToProps.

react-tracked is a library for global state without Redux. This library provides almost compatible hooks API to React-Redux. It's developed with performance in mind, and it should be as performant as React-Redux, even though it utilizes only React context. See the GitHub repo for more information.

This post shows benchmark results to convince that it actually is performant in one scenario.

It's worth mentioning that react-tracked, as the name implies, has another useTrackedState hook that has capability of state usage tracking. Unlike useSelector, developers don't need to define selectors for this hook.

It's also worth mentioning that another library reactive-react-redux provides the useTrackedState hook for Redux. See the GitHub repo for more information.

We compare all hooks described above.

Benchmark tool

To benchmark different frameworks, js-framework-benchmark is used.

Checkout the forked repo if you want to reproduce the benchmark result at your end.

Benchmark results

  • react-tracked-useTrackedState: useTrackedState in react-tracked v0.4.0
  • react-tracked-useSelector: useSelector in react-tracked v0.4.0
  • reactive-react-redux-useTrackedState: useTrackedState in reactive-react-redux v4.0.0-beta.0
  • reactive-react-redux-useSelector: useSelector in reactive-react-redux v4.0.0-beta.0
  • react-redux-hooks: useSelector in react-redux v7.1.0




Closing notes

The benchmark code for useSelector is almost identical among three libraries. The code for useTrackedState is also identical between two libraries. However, the code for useSelector and the code for useTrackedState is a bit different and they are optimized separately. Hence, be reminded when comparing with different hooks.

I hope these results encourage developers to try my two libraries.

Originally published at on June 16, 2019.

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