Do, If/ElseIf/If, While, Repeat/While, For in Swift (only using switch cases and recursion)

do_if_else_repeat_while_for.swift

typealias VoidFuncType = () -> Void
typealias BoolFuncType = () -> Bool

/**
 IF/ELSE STATEMENT
 */
typealias ElseIfType = (Bool, VoidFuncType) -> IfElse
typealias ElseType = (VoidFuncType) -> Void

struct IfElse {
    let else_if_: ElseIfType
    let else_   : ElseType
}

func else_(f: VoidFuncType) { f() }
func noElse_(_: VoidFuncType) -> Void { return }
func noElseIf_(_: Bool, _: VoidFuncType) -> IfElse {
    return IfElse(else_if_: noElseIf_, else_: noElse_)
}

func if_(cond: Bool, f:VoidFuncType) -> IfElse {
    switch cond {
    case true:
        f()
        return IfElse(else_if_: noElseIf_, else_: noElse_)
    case false:
        return IfElse(else_if_: if_, else_: else_)
    }
}

//-- IF
if_(true) {
    print("Hi IF 1")
}
.else_if_(false) {
    print("Hi")
}
.else_if_(false) {
    print("Hi ELSE IF 1")
}
.else_{
    print("Hi ELSE 1")
}
//-> "Hi IF 1"

//-- ELSE IF
if_(false) {
    print("Hi IF 2")
}
.else_if_(false) {
    print("Hi")
}
.else_if_(true) {
    print("Hi ELSE IF 2")
}
.else_{
    print("Hi ELSE 2")
}
//-> "Hi ELSE IF 2"

//-- ELSE
if_(false) {
    print("Hi IF 3")
}
.else_if_(false) {
    print("Hi")
}
.else_if_(false) {
    print("Hi ELSE IF 3")
}
.else_{
    print("Hi ELSE 3")
}
//-> "Hi ELSE 3"


print("")
/**
 WHILE STATEMENT
 */
private func whileLogic(@autoclosure cond: BoolFuncType, @noescape f:VoidFuncType) {
    switch cond() {
    case true:
        f()
        while_(cond, f: f)
    case false:
        return
    }
}

func while_(@autoclosure cond: BoolFuncType, @noescape f:VoidFuncType) {
    whileLogic(cond, f: f)
}

var i = 0
while_(i < 10) {
    print("\(i) ")
    i++
}
//-> "0 1 2 3 4 5 6 7 8 9"


print("")
/**
 REPEAT WHILE STATEMENT
 */
struct DoWhile {
    let f: VoidFuncType
    func while_(@autoclosure cond: BoolFuncType) {
        whileLogic(cond, f: f)
    }
}

func do_(f:VoidFuncType) -> DoWhile {
    f()
    return DoWhile(f: f)
}

i = 0
do_{
    print("\(i) ")
    i++
}.while_(i < 10)
//-> "0 1 2 3 4 5 6 7 8 9"


print("")
/**
 FOR STATEMENT
 */
func for_(
    @autoclosure initialiser: VoidFuncType,
    @autoclosure _ cond: BoolFuncType,
    @autoclosure _ incrementer: ()->Any?,
    f:VoidFuncType
) {
    initialiser()
    whileLogic(cond) {
        f()
        incrementer()
    }
}

for_(i = 0, i < 10, i++) {
    print("\(i) ")
}
//-> "0 1 2 3 4 5 6 7 8 9"