Usememo object dependency. And this is what the React docs have to say about this.

Usememo object dependency. Let’s see what happens if we do go down that path. is), useMemo will return the value you already calculated before. And this is what the React docs have to say about this. Mar 10, 2023 · When you use useMemo, you can calculate the value of a variable or function once and reuse it across multiple renders, rather than recalculating it every time your component re-renders. Dec 3, 2020 · One simple solution is to serialize this array using JSON. If none of the dependencies have changed (compared with Object. memo children, you’ll trigger re-renders unnecessarily. Aug 17, 2025 · Sometimes useMemo is used only to avoid recalculations, but its other superpower is keeping the same reference for objects/arrays. You should only rely on useMemo as a performance optimization. If any of the dependencies change, useMemo will recompute the memoized value. I assume you mean useMemo(() => ({}), []). Here's an example of how to memoize an expensive computation using useMemo: Jul 9, 2019 · Remember, the dependency list is there to specify what gets shallow compared for memoization, not what gets passed down. If you skip this when passing props to React. . stringify(), then use this stringified value in dependency array, and get the original array by deserializing serialized value: Feb 7, 2024 · Specify Dependencies: Provide an array of dependencies to useMemo to indicate when the memoized value should be recalculated. Jan 30, 2024 · First of all, useMemo takes as arguments a function to calculate the value and a dependency array, so useMemo({}) is just wrong. Otherwise, React will re-run your calculation and return the new value. hyp qze vhtwibr pbcge kanah ould hzep cvwwj juhwm sduwn