Using the useCallback React Hook

Using the useCallback React Hook

Learn how to use the useCallback React hook. The useCallback React hook is a useful hook that can help in optimizing the rendering performance of our functional React components

The useCallback React hook is a useful hook that can help in optimizing the rendering performance of our functional React components. It is used to memoize functions which means it caches the return value of a function given a set of input parameters.

The syntax

const memoizedCallback = useCallback(
  () => {
    functionToBeMemoized(arg);
  },
  [arg],
);

As we can see, the useCallback React hook takes in an inline function and its dependencies as parameters and returns a memoized version of the function. The returned memoized function changes only when one of the passed dependencies has changed. Therefore it is guaranteed to have the same reference value if the input arguments are the same.

This is useful when we want to pass callbacks as props to children components and want to optimize the components to avoid re-rendering since React relies on reference equality of props. A memoized function will have the same reference for a given set of parameters, thus avoiding re-rendering.

Before we get into the applications of the useCallback React hook, we should know that React itself is fairly fast and we should avoid any premature optimizations and only use this hook when we need to.

As with the useEffect dependencies, if we pass in an empty array of dependencies, the memoized function is computed only once. It will store the same reference throughout the lifecycle of the component then.




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