This usage of the word ‘functional’ goes back to the Calculus of Variations, as:
—a Function whose Argument is also Function
—a #HigherOrderFunction (HOF) which returns a Function as its result
cf: #ProceduralParameter: a Parameter of a Procedure that is itself a Procedure
Yes I know, Higher Order Function seems so daunting at first. What is it with order thing? Higher ? What does that even mean ?
Don't worry, I will explain it to you with human language.😎
Actually its concept is very simple.
#javascript#higherorderfunction