Programming Kotlin

Currying and partial application

A common technique in functional programming is the concept of currying. Currying is the process of transforming a function that accepts multiple parameters into a series of functions, each of which accept a single function. Take the following definition of foo:

    fun foo(a: String, b: Int) : Boolean 

The curried form would look like the following:

    fun foo(a: String): (Int) -> Boolean 

Note that the curried foo returns a second function, which in turn, when invoked with an Int, would return the Boolean as before. Currying is a useful technique for allowing functions with multiple parameters to work with other functions that only accept single arguments.

Currying is related to the idea of partial application. Partial ...