Radu Dan radude89

## optional-implementation.swift
enum Optional<Wrapped>: ExpressibleByNilLiteral {
  case none
  case some(Wrapped)
}

## example-of-nils.swift
let greeting: String? = nil // preferred
let greeting2: String? = .none // same thing
let greeting3: Optional<String> = .none // same thing

## void-example-1.swift
func doSomeStuff() {
    // magic stuff
}

## void-example-1b.swift
func doSomeStuff() -> Void {
    // magic stuff
}

## void-example-2.swift
func doSomeStuff() {} // preferred
func doSomeStuff2() -> Void {} // same thing
func doSomeStuff3() -> () {} // same thing

## void-example-3.swift
func doSomeStuff(completion: () -> Void) {
    // magic stuff
}

## void-example-4a.swift
func doSomeStuff(completion: (Void) -> ()) {

}

func doSomeStuff2(completion: () -> ()) {

}

## void-example-4b.swift
func outside() {
    doSomeStuff { result in
        // some closure stuff
    }

    doSomeStuff2 {
        // some closure stuff
    }
}

## never-example-1.swift
func dumpAndCrush() -> Never {
        // export output to log
        // save
        fatalError("App went dark! Check the logs why.")
    }

// fatalError declaration
func fatalError(_ message: @autoclosure () -> String = String(),
                file: StaticString = #file,
                line: UInt = #line) -> Never

## never-example-2.swift
func doSomeStuff(with numbers: [Int]) {
    guard numbers.count > 5 else {
        preconditionFailure("Stuff happens when there are more than five numbers!")
    }

    // do some stuff
}

// preconditionFailure declaration
func preconditionFailure(_ message: @autoclosure () -> String = String(),
	enum Optional<Wrapped>: ExpressibleByNilLiteral {
	case none
	case some(Wrapped)
	}
	let greeting: String? = nil // preferred
	let greeting2: String? = .none // same thing
	let greeting3: Optional<String> = .none // same thing
	func doSomeStuff() {} // preferred
	func doSomeStuff2() -> Void {} // same thing
	func doSomeStuff3() -> () {} // same thing
	func doSomeStuff(completion: (Void) -> ()) {

	}

	func doSomeStuff2(completion: () -> ()) {

	}
	func outside() {
	doSomeStuff { result in
	// some closure stuff
	}

	doSomeStuff2 {
	// some closure stuff
	}
	}
	func dumpAndCrush() -> Never {
	// export output to log
	// save
	fatalError("App went dark! Check the logs why.")
	}

	// fatalError declaration
	func fatalError(_ message: @autoclosure () -> String = String(),
	file: StaticString = #file,
	line: UInt = #line) -> Never
	func doSomeStuff(with numbers: [Int]) {
	guard numbers.count > 5 else {
	preconditionFailure("Stuff happens when there are more than five numbers!")
	}

	// do some stuff
	}

	// preconditionFailure declaration
	func preconditionFailure(_ message: @autoclosure () -> String = String(),