UseMemo is a built-in hook in React that allows you to memoize expensive functions so that you don't have to call them every time you render. Simply supply a function and an array of inputs to useMemo, and it will only recompute the memoized value if one of the inputs changes.
When a component utilises a time-consuming function to compute a value.
Consider another instance in which we have a component that does some action when some data changes, such as the useEffect hook, which logs if a dependency changes.
The useMemo version renders 1 right away. The useEffect version renders null, then runs the effect, changes the state, then queues up a new render with 1 after the component renders.
UseMemo is a built-in hook in React that allows you to memoize expensive functions so that you don't have to call them every time you render. Simply supply a function and an array of inputs to useMemo, and it will only recompute the memoized value if one of the inputs changes.
The introduction of useEffect Hook was motivated by the desire to eliminate the negative consequences of employing class-based components. Tasks like as changing the DOM, obtaining data from API endpoints, setting up subscriptions or timers, and so on might result in unintended side effects.
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Very helpful course in learning ReactJS
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VERY GOOD COURSE OF REACT JS
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This series is usefull for just starting and building confident. Go further and explore more about React JS
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