Function Currying

In the context of function currying, 'arity' refers to the number of parameters a function takes. Functions are often described by their arity - unary functions take one parameter, binary functions take two, ternary functions take three, and so on. Currying transforms a function of arity n into n functions of arity 1. This transformation is significant in functional programming because it standardizes functions to a form that's easier to compose and work with. Understanding the arity of functions is crucial when implementing currying, as it determines how many nested functions will be created and how many separate calls will be needed to fully evaluate the function.