【技术】Golang小tips——interface{}

interface{} 任意参数传值

函数的传值中，interface{}是可以传任意参数的
想当然的写了如下代码测试，然而并不好使

func main() {
    Any(1)
    Any("222")
}

func Any(v interface{})  {
     v1:=int(v)
     println(v1)
    
}

搞了半天发现需要如下处理，不得不佩服go的严谨

func main() {
    Any(1)
    Any("222")
}
func Any(v interface{})  {

    if v2, ok := v.(string);ok{
        println(v2)
    }else if v3,ok2:=v.(int);ok2{
        println(v3)
    }
}

原因如下：
Conversions are expressions of the form T(x) where T is a type and x is an expression that can be converted to type T.
A non-constant value x can be converted to type T in any of these cases:

• x is assignable to T.
• x's type and T have identical underlying types.
• x's type and T are unnamed pointer types and their pointer base types have identical
• underlying types.
• x's type and T are both integer or floating point types.
• x's type and T are both complex types.
• x is an integer or a slice of bytes or runes and T is a string type.
• x is a string and T is a slice of bytes or runes.

翻译太渣，各位看官请自行食用