Ejemplo de código de React.useMemo

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Ejemplo 1: usememo hook react

const[a,setA]=useState(0);const[b,setB]=useState(0);constpow=(a)=>returnMath.pow(a,2);var val=useMemo(()=>returnpow(a);// calling pow function using useMemo hook,[a]);// only will be called once a will changed (for "a" we can maintain state)return(<input type="text" onChange=(e)=>setA(e.target.value)><input type="text" onChange=(e)=>setB(e.target.value)>val// to access the value from useMemo)

Ejemplo 2: reaccionar usememo

const memoizedValue =useMemo(()=>computeExpensiveValue(a, b),[a, b]);Returns a memoized value.Pass a “create” function and an array of dependencies.useMemo will only recompute the memoized value when one of the dependencies has changed.This optimization helps to avoid expensive calculations on every render.Remember that the function passed to useMemo runs during rendering.Don’tdo anything there that you wouldn’t normally dowhile rendering.For example, side effects belong in useEffect, not useMemo.If no array is provided, a newvalue will be computed on every render.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.

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