key term - Outer Function

Definition

The outer function is the second or "outside" layer of a composite function. It takes as its input (or argument) what comes out from applying an inner (first/inside) function on some initial value.

Related terms

Composite Function:

A composite function is formed by applying one function to the output of another function. In other words, it's like putting one function inside another.

Inner Function: The inner function is the first or "inside" function in a composite function. It's applied to an input value before passing its output to another (outer) function.

Function Composition: This term refers to combining two or more functions together in order to create a new composite one.