Blog_SyntaxCheatCodes.swift

// Swift: Syntax Cheat Codes
// ↑ ↑ ↓ ↓ ← → ← → B A
//
// Author: Andyy Hope
// Twitter: @andyyhope
// Medium: medium.com/@andyyhope


import UIKit

// MARK: - Closure

UIView.animate(withDuration: 3, animations: {
    // This is a closure in an argument
})


// MARK: - Trailing Closure

UIView.animate(withDuration: 3) {
    // This is a trailing closure
    // It's the same API call as the one above
}


// MARK: More closure stuff

let closure: () -> Void

func doSomething(something: () -> Void) {
    something()
}

//let usedClosure = closure()
//doSomething(usedClosure)

// MARK: - Type Alias

typealias TripleThreat = (Int, String, Double) -> (Int, String, Double)

// Without typealias

func _dance(dance: (Int, String, Double) -> (Int, String, Double)) { }
func _sing(sing: (Int, String, Double) -> (Int, String, Double)) { }
func _act(act: (Int, String, Double) -> (Int, String, Double)) { }


// With typealias

func dance(dance: TripleThreat) { }

func act(act: TripleThreat) { }

func sing(sing: TripleThreat) { }


// MARK: - Shorthand Argument Names

func say(_ message: String, completion: (_ goodbye: String) -> Void) {
    print(message)
    completion("Goodbye")
}

say("Hi") { (goodbye: String) -> Void in
    print(goodbye)
}

// prints: "Hi"
// prints: "Goodbye"

say("Hi") { print($0) }

// prints: "Hi"
// prints: "Goodbye"