When should we pass function as argument to another function ?

Question

We can simply call one function in another, then what is the advantage of passing a function as argument to other function ??

Answer 1

the thing that you said is called "functional programming"
Functional programming can be advantageous when you are going to be performing lots of different operations on data that has a fixed, known amount of variation.
In functional languages the program is structured such that it treats computation as the evaluation of mathematical functions. And this is really good for: Gaming and Artificial Intelligence.
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