useMemois a hook that allows you to memoize (or cache) a value. It takes a function that computes a value and a dependency array as its arguments. The value computed by the function will be memoized and returned by the hook. This memoized value will only be recomputed when one of the...
const computedValue = useMemo(()=>{ doSomething(); }, [dependencies]); useMemo works similarly to the useCallback, but rather than returning the function, it returns the computed value from the function, i.e. the function’s output, and only recomputes the function when the dependencies ...
TheuseCallbackHook only runs when one of its dependencies update. This can improve performance. TheuseCallbackanduseMemoHooks are similar. The main difference is thatuseMemoreturns a memoizedvalueanduseCallbackreturns a memoizedfunction. You can learn more about useMemo in the useMemochapter. ...
useCallback() is similar to useMemo(), but it memorizes functions instead of values, which makes your application run faster by preventing re-creations. The useCallback hook is particularly useful when passing functions as props to highly optimized child components, ensuring that these functions ma...
Let's use an example to illustrate. I will create a new component Counter.js with 2 buttons- one to increment counter1 and other to increment counter2. Based on the counter1 value, we will show whether is odd or even. import React , {useState, useMemo} from 'react'; ...
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