Curried Functions in Swift

curriedfuncs.m

// Curried Functions in Swift
// Juan C. Montemayor (@norsemelon)
// Excerpt From: Apple Inc. “The Swift Programming Language.” iBooks. https://itun.es/us/jEUH0.l

// Syntax: func name (x1: t1)(x2: t2) -> t { ... }
// Note: it has a paren pair for every variable, as opposed to `(x1: t1, x2: t2)`
func addTwoNumbers(a: Int)(b: Int) -> Int {
    return a + b
}
 
// This won't compile, since names are required for any param that's not the first
// Probably a bug?
// addTwoNumbers(4)(5) // Returns 9

addTwoNumbers(4)(b: 6) // Result: 10

var add4 = addTwoNumbers(4) // Functions are first-class. Hooray!
add4(b: 10) // We still need to call this with the param name... :(