Higher-order function

In mathematics and computer science, a higher-order function (HOF) is a function that does at least one of the following:

takes one or more functions as arguments (i.e. a procedural parameter, which is a parameter of a procedure that is itself a procedure),
returns a function as its result.

All other functions are first-order functions. In mathematics higher-order functions are also termed operators or functionals. The differential operator in calculus is a common example, since it maps a function to its derivative, also a function. Higher-order functions should not be confused with other uses of the word “functor” throughout mathematics, see Functor (disambiguation).

Reference

https://en.wikipedia.org/wiki/Higher-order_function

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Higher-order function

Reference