这里不涉及函数作为参数和返回值的情况。

进军iOS开发了哈。

计划六一前，搞一个套H5的App出来,

靠谱么？

其实，看过了java,php,javascript,python,go之后，

再在看swift，感觉很亲切啊，

都是老熟人。

func greet(person: String) -> String {	let greeting = "Hello, " + person + "!"	return greeting}print(greet(person: "Anna"))print(greet(person: "Brian"))func sayHelloWorld() -> String {	return "hello, world"}print(sayHelloWorld())func greet2(person: String) {	print("Hello, \(person)!")}greet2(person: "Dave")func printAndCount(string: String) -> Int {	print(string)	return string.characters.count}func printWithoutCounting(string: String) {	let _ = printAndCount(string: string)}printAndCount(string: "Hello, world")printWithoutCounting(string: "Hello, world")func minMax(array: [Int]) -> (min: Int, max: Int)? {	if array.isEmpty {return nil}	var currentMin = array[0]	var currentMax = array[0]	for value in array[1..
    
      currentMax {			currentMax = value		}	}	return (currentMin, currentMax)}if let bounds = minMax(array: [8, -6, 2, 109, 3, 71]) {	print("min is \(bounds.min) and max is \(bounds.max)")}func gt(person: String, from hometown: String) -> String {	return "Hello \(person)! glad you could visit from \(hometown)."}print(gt(person: "Bill", from: "Cupertino"))func someFunc(_ firstP: Int, secondP: Int) {	print(firstP + secondP)}someFunc(1, secondP: 5)func someFunc2(pWithoutD: Int, pWithD: Int = 12) {	print(pWithoutD + pWithD)}someFunc2(pWithoutD: 5)func arithmeticMean(_ numbers: Double...) -> Double {	var total: Double = 0	for number in numbers {		total += number	}	return total / Double(numbers.count)}print(arithmeticMean(1, 2, 3, 4, 5))print(arithmeticMean(3, 5.34, 12.38, 67, 21.97))func swapTwoInts(_ a: inout Int, _ b: inout Int) {	let temporaryA = a;	a = b	b = temporaryA}var someInt = 3var anotherInt = 107swapTwoInts(&someInt, &anotherInt)print("someInt is now \(someInt), and anotherInt is now \(anotherInt)")