Package Exports

use-memo-one

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Readme

useMemoOne

useMemo and useCallback with semantic guarantee (stable references)

Background

useMemo and useCallback cache the most recent result. However, this cache can be destroyed by React when it wants to:

You may rely on useMemo as a performance optimization, not as a semantic guarantee. In the future, React may choose to “forget” some previously memoized values and recalculate them on next render, e.g. to free memory for offscreen components. Write your code so that it still works without useMemo — and then add it to optimize performance. - React docs

useMemoOne and useCallbackOne are concurrent mode safe alternatives to useMemo and useCallback that do provide semantic guarantee. What this means is that you will always get the same reference for a memoized so long as there is no input change.

Install

# npm
npm install use-memo-one --save
# yarn
yarn add use-memo-one

Usage

import { useMemoOne, useCallbackOne } from 'use-memo-one';

function App(props) {
  const {name, age } = props;
  const value = useMemoOne(() => ({hello: name}), [name]);
  const getAge = useCallbackOne(() => age, [age])

  // ...
}

API

See useMemo and useCallback