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// closure 001 let superstar001 = { (name : String, yearOfBirth : Int) -> String in return "name : \(name), yearOfBirth : \(yearOfBirth)" } print(superstar001("nature boy", 1949)) // name : nature boy, yearOfBirth : 1949 // closure 002 let superstar002 = { (name : String, yearOfBirth : Int) -> String in "name : \(name), yearOfBirth : \(yearOfBirth)" } print(superstar002("dead man", 1965)) // nam..

let inputValue = "A" print("\u{30}") // result : 0 print("\u{39}") // result : 9 print("\u{41}") // result : A print("\u{5a}") // result : Z print("\u{61}") // result : a print("\u{7a}") // result : z // check positive number if inputValue >= "\u{30}" && inputValue = "\u{41}" && inputValue = "\u{61}" && inputValue

var a : Int? = 100 var b : Int? = nil if let num = a { print("num = \(num)") } else { print("num is nil") } // result : num = 100 if let num = b { print("num = \(num)") } else { print("num is nil") } // result : num is nil if var num = a { num *= 2 print("num = \(num)") } else { print("num is nil") } // result : num = 200

var a = "100" var b = "200" var c = "300" print(a, b, c) // result : 100 200 300 print(a, b, c, separator: ", ") // result : 100, 200, 300 print(a, terminator: "") print(b, terminator: "") print(c, terminator: "") // result : 100200300 print(a) print(b) print(c) // result : 100\n200\n300\n

for index in 0...5 { print(index, terminator: "") } // result : 012345 for index in 0..

var items = ["a", "b", "c", "e", "f"] items.removeLast() print(items.count) // result : 4 print(items.capacity) // result : 5

var number : Int? = nil print(number) // result : nil (Expression implicitly coerced from 'Int?' to 'Any') print(number ?? 0) // result : 0 print(number!) // result : error (Unexpectedly found nil while unwrapping an Optional value)

let str = "hello world" for item in str { print(item) } /* result : h e l l o w o r l d */

var isBool = true var number = 0 while isBool { print("origin number : \(number), ", terminator: "") number += 1 print("current number : \(number)") if number == 10 { isBool = false } } /* result : origin number : 0, current number : 1 origin number : 1, current number : 2 origin number : 2, current number : 3 origin number : 3, current number : 4 origin number : 4, current number : 5 origin num..

// set : not allow duplicate value var strSet = Set() strSet.insert("100") strSet.insert("200") strSet.insert("300") strSet.insert("100") strSet.insert("200") strSet.insert("300") print(strSet) // result : ["100", "200", "300"] var strArr = ["100", "200", "300", "100", "200", "300",] print(strArr) // result : ["100", "200", "300", "100", "200", "300"] print(Set(strArr)) // result : ["200", "100"..