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var a : Int? = 100 var b : Int? = nil func guardFunc001 () { guard let p1 = a else { print("p1 is nil") return } print("p1 = \(p1)") } func guardFunc002 () { guard let p1 = b else { print("p1 is nil") return } print("p1 = \(p1)") } guardFunc001() // resut : p1 = 100 guardFunc002() // resut : p1 is nil

var numbers001 = [String : Int]() numbers001["zero"] = 0 numbers001["one"] = 1 numbers001["two"] = 2 numbers001["three"] = 3 numbers001["four"] = 4 numbers001["five"] = 5 numbers001["six"] = 6 numbers001["nil"] = nil print(numbers001) // result : ["four": 4, "three": 3, "two": 2, "one": 1, "five": 5, "zero": 0, "six": 6] var numbers002 : [String : Int] = ["하나" : 1, "둘" : 2, "셋" : 3, "넷" : 4, "다섯..