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In React, dependency arrays are a concept that is inextricably linked to hooks (thus also to function components). Some hooks contain two arguments, such as useEffect and useCallback. A callback (a function) is the first, and the dependency array is the second. It has the form of a variable array.

His teammates reasoned that "every callback function should be memoized to prevent needless re-rendering of child components that use the callback method." This explanation is completely false. The use of useCallback() without profiling slows down the component.

The use of React Callback Hook returns a callback function that has been memorised. Consider memoization to be the act of storing a value so that it does not have to be recalculated. This allows us to separate resource-intensive routines from the rest of the render so that they don't run every time.

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