'Is there tools or skills for easily detecting functions that call a function?

I just made my first tiny web service by myself, and I should update and maintain the service by myself alone.

And I have trouble with updating and maintaining service.

because When I modify a function, it is hard to know which functions use the function, so I can't be convinced what will happen with that update. there maybe bugs, or error by functions using the function while can't be recognized.

If the update don't change the function's input values and return values, I don't worry about that. but If there is need to change input values or return values, How can I handle the problem?

Is it better to make new similar function? but I think making similar functions can cause problems for long period.

functionmaintenance


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