笔者之前写过一篇关于类型转换和类型断言，还有一个类似的语法叫类型判断： type-switch。该语法通过switch和关键字type的类型断言用来判断类型。
var t interface{}
t = functionOfSomeType()
switch t := t.(type) {
default:
fmt.Printf("unexpected type %T\n", t) // %T prints whatever type t has
case bool:
fmt.Printf("boolean %t\n", t) // t has type bool
case int:
fmt.Printf("integer %d\n", t) // t has type int
case *bool:
fmt.Printf("pointer to boolean %t\n", *t) // t has type *bool
case *int:
fmt.Printf("pointer to integer %d\n", *t) // t has type *int
}
注: type-switch 只用于判断interface
代码来源: Effective Go
