将nil [] byte变量转换为string不会感到惊慌。 为什么不？

Question

package main

import ("fmt")

func main() {

    var bts []byte =nil
    fmt.Println("the result :", string(bts)) // why not panic ?
    // the result :
}

https://play.golang.org/p/dzRzzKvUyd

Answer 1

In general for any type that can be nil you can generate whatever string representation you like! It's because when implementing fmt.Stringer interface (see here) - or any function on a type that can be nil - you can have a nil for receiver value. In other words you can call methods on nil objects in contrast with OOP languages. In this sample code, you'll see ʕ◔ϖ◔ʔ hey nilo! for a nil value of the second type, but BOO DATA!!! :: Hi! :) when you have an element inside (it prints just the first element as a sample code).

And again keep in mind nil is typed in go.