golang 类型断言

package main

import "fmt"

func main() {
    a := 39
    b := 21.1
    c := true
    d := "hello"
    e := []string{"hello"}

    checkType(a)
    checkType(b)
    checkType(c)
    checkType(d)
    checkType(e)
}

func checkType(t interface{}) {
    switch val := t.(type) {
    case nil:
        fmt.Println("nil")
    case int, int32, int64:
        fmt.Println("intx", val)
    case float32, float64:
        fmt.Println("floatx", val)
    case string:
        fmt.Println("string", val)
    case bool:
        fmt.Println("bool", val)
    default:
        fmt.Println("other", val)
    }
}

out

intx 39
floatx 21.1
bool true
string hello
other [hello]