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useMemo

Poised Puffin answered on March 12, 2021 Popularity 10/10 Helpfulness 2/10

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    useMemo is a hook that takes a function and a list of dependencies as arguments, and returns a value that is the result of calling the function. The value is stored in a cache and is only re-computed if one of the dependencies has changed.

    Here is the syntax for useMemo:

    In this example, the component calculates the sum of the first props.x positive integers using an expensive loop. The value is stored in a cache and is only re-computed if either props.x or props.y changes. This can help to improve the performance of the component by avoiding unnecessary re-calculations.

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