useCallback vs useMemo | Dataford Interview Questions

Explain the difference between useCallback and useMemo.

Implement describe_hook(hook_name) to return the purpose, cached entity, and typical use of either React hook. Return None for unsupported hook names.

Input and Output

The input is a string, either "useCallback" or "useMemo". Return a dictionary with keys purpose, caches, and use_when.

Constraints

hook_name is a string
hook_name is either "useCallback", "useMemo", or an unsupported hook name
Return None for unsupported hook names
The returned dictionary must contain exactly the keys purpose, caches, and use_when for supported hooks

Function Signature

def describe_hook(hook_name):

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