Swift when-then-else

gistfile1.txt

// Just an experiment for composing if else in a more structured way

// usage 
var isLoadMoreAllowed = false
func loadMore() { 
  print("loading more")  
}

when(isLoadMoreAllowed)
    .then { loadMore() }
    .else { print ("do something else") }


// implementation 

// global function
func when(_ bool: Bool) -> Bool.Some {
    Bool.Some(bool: bool)
}

// Bool extension
extension Bool {

    struct Some {

        fileprivate let bool: Bool

        @discardableResult
        func then(_ execute: () -> Void) -> Bool.Some {
            guard bool else { return self }
            execute()
            return self
        }

        @discardableResult func `else`(_ execute: () -> Void) -> Bool.Some {
            guard bool else {
                execute()
                return self
            }
            return self
        }

    }
}