useMemo Hook | React | Javascript
What is the use of useMemo hook in react ?
useMemo is a React Hook that lets you cache the result of a calculation between re-renders.
const cachedValue = useMemo(calculateValue, dependencies)
Reference
useMemo(calculateValue, dependencies)
Usage
Skipping expensive recalculations
Skipping re-rendering of components
Memoizing a dependency of another Hook
Memoizing a function
Troubleshooting
My calculation runs twice on every re-render
My useMemo call is supposed to return an object, but returns undefined
Every time my component renders, the calculation in useMemo re-runs
I need to call useMemo for each list item in a loop, but it’s not allowed
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