Idiomatic way to do conversion/type assertion on multiple return values in Go
casting, go, return-value
Solution
You can't do it in a single line. Your temporary variable approach is the way to go.
By the way, is it called casting when it comes to interfaces?
It is actually called a type assertion. A type cast conversion is different:
var a int
var b int64
a = 5
b = int64(a)
Problem
What is the idiomatic way to cast multiple return values in Go? Can you do it in a single line, or do you need to use temporary variables such as I've done in my example below? ``` package main import "fmt" func oneRet() interface{} { return "Hello" } func twoRet() (interface{}, error) { return "Hejsan", nil } func main() { // With one return value, you can simply do this str1 := oneRet().(string) fmt.Println("String 1: " + str1) // It is not as easy with two return values //str2, err := twoRet().(string) // Not possible // Do I really have to use a temp variable instead? temp, err := twoRet() str2 := temp.(string) fmt.Println("String 2: " + str2 ) if err != nil { panic("unreachable") } } ``` By the way, is it called `casting` when it comes to interfaces? ``` i := interface.(int) ```