檢查變數型別
在某些情況下,從函式返回變數時,你無法確定變數的型別。如果你不確定它是什麼型別,你可以使用 var.(type)
檢查變數的型別:
x := someFunction() // Some value of an unknown type is stored in x now
switch x := x.(type) {
case bool:
fmt.Printf("boolean %t\n", x) // x has type bool
case int:
fmt.Printf("integer %d\n", x) // x has type int
case string:
fmt.Printf("pointer to boolean %s\n", x) // x has type string
default:
fmt.Printf("unexpected type %T\n", x) // %T prints whatever type x is
}