On Sun, Jan 28, 2018 at 12:53 AM, Wenbin Shang <wbsh...@gmail.com> wrote:
>
> The following code:
>
> package main
>
> import "fmt"
>
> func main() {
> var i int
> fmt.Println(i)
> if true {
> i = 5
> i, j := 3, 4
> fmt.Println(i, j)
> }
> fmt.Println(i)
> }
>
> Output:
> 0
> 3 4
> 5
>
> Is this a reasonable behavior? I intuitively thought only j is declared in
> if block and i will be the same as outer one.
This is indeed how the language works. The scope of a variable begins
at the point at which it is declared. So the `i, j := 3, 4` in the
inner block is the start of the scope of the inner i. The `i = 5`
appears before that scope, and therefore refers to the i in the outer
block.
Ian
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