swift3.0 2차 배열

1.

var product = [String:[String]]() product = ["it":["phone","computer"],"school":["pen","note"]] product["it"]?.append("tablet") print(product)  //["it": ["phone", "computer", "tablet"], "school": ["pen", "note"]] product.updateValue(["handle"], forKey: "car") print(product)   //["it": ["phone", "computer", "tablet"], "car": ["handle"], "school": ["pen", "note"]

2.

var product2 = [String:[String:Any]]() product2 = ["it":["phone":4],"school":["pen":2,"note":3]] product2["it"]?.updateValue(1, forKey: "computer")  //it에 추가적으로 값을 넣는다. print(product2) ["it": ["phone": 4, "computer": 1], "school": ["pen": 2, "note": 3]] product2.updateValue(["android":1], forKey: "it") //it에 기존값을 제거하고 새롭게 넣는다. print(product2) ["it": ["android": 1], "school": ["pen": 2, "note": 3]] product2.updateValue(["handle":1,"gear":1], forKey: "car")  //car 값을 새롭게 넣는다. print(product2) ["it": ["android": 1], "car": ["gear": 1, "handle": 1], "school": ["pen": 2, "note": 3]]

3.

var product2 = [String:[String:Any]]() product2 = ["it": ["phone": 4, "computer": 1], "car": ["gear": 1, "handle": 1], "school": ["pen": 2, "note": 3]] for name in product2.keys {     print("My first key is \(name)") //1번째 key값을 가져온다.      //My first key is it      //My first key is car     //My first key is school     if let second = product2[name] {         for (key, value) in second {                        print("My Second key is \(key)")  //2번째 key값을 가져온다.             //My Second key is phone             //My Second key is computer             //My Second key is handle             //My Second key is gear             //My Second key is pen             //My Second key is note             print("My value is \(value)") //value를 가져온다.             //My value is 4             //My value is 1             //My value is 1             //My value is 1             //My value is 2             //My value is 3         }     } }

- 결과값

My first key is it My Second key is phone My value is 4 My Second key is computer My value is 1 My first key is car My Second key is handle My value is 1 My Second key is gear My value is 1 My first key is school My Second key is pen My value is 2 My Second key is note My value is 3