### ok-pattern ``` if t, ok := X.(T); ok == true { // 接口變量是該類型時處理 } ``` ``` package main import "fmt" // 創建一個結構體 type Datalist struct { Name string Age int } func main() { // 切片 s := make([]interface{}, 3) s[0] = 1 s[1] = "abc" s[2] = Datalist{"Pony", 20} //結構體 // 遍歷 for index, data := range s { if t, ok := data.(int); ok == true { fmt.Printf("s[%d] Type = int, Value = %d\n", index, t) } if t, ok := data.(string); ok == true { fmt.Printf("s[%d] Type = string, Value = %s\n", index, t) } if t, ok := data.(Datalist); ok == true { fmt.Printf("s[%d] Type = Datalist, Datalist.Name = %v, Datalist.Age = %d\n", index, t.Name, t.Age) } } } 結果： s[0] Type = int, Value = 1 s[1] Type = string, Value = abc s[2] Type = Datalist, Datalist.Name = Pony, Datalist.Age = 20 ``` ### switch-type ``` switch t := X.(T){ case 類型1: //接口類型是類型1時處理 case 類型2 : // 接口類型是類型2時處理 ... default: //當類型不是case中所列舉的類型時處理 } ``` ``` package main import "fmt" // 創建一個結構體 type Datalist struct { Name string Age int } func main() { // 切片 s := make([]interface{}, 3) s[0] = 1 s[1] = "abc" s[2] = Datalist{"Pony", 20} //結構體 // 遍歷 for index, data := range s { switch t := data.(type) { case int: fmt.Printf("s[%d] Type = int, Value = %d\n", index, t) case string: fmt.Printf("s[%d] Type = string, Value = %s\n", index, t) case Datalist: fmt.Printf("s[%d] Type = Datalist, Datalist.Name = %v, Datalist.Age = %d\n", index, t.Name, t.Age) } } } 結果： s[0] Type = int, Value = 1 s[1] Type = string, Value = abc s[2] Type = Datalist, Datalist.Name = Pony, Datalist.Age = 20 ```