On Monday, 15 January 2018 21:23:40 UTC-5, sheepbao wrote:
>
> I wrote this code, and why `map=nil` don't stop the loop?
> ```go
>
> func mapTest() {
>
> m := map[int]int{1: 1, 2: 2}
>
> for k, v := range m {
>
> println(k, v)
>
> m = nil
>
> }
>
> }
>
> ```
>
> output:
>
> 1 1
>
> 2 2
>
>
> I don't understand when I set `m = nil`, the loop is not stop. m doesn't
> seem to be affected.
>
https://golang.org/ref/spec#For_statements
*The range expression is evaluated once before beginning the loop, with one
exception: if the range expression is an array or a pointer to an array and
at most one iteration variable is present, only the range expression's
length is evaluated; if that length is constant, by definition the range
expression itself will not be evaluated. *
--
Kevin Powick
--
You received this message because you are subscribed to the Google Groups
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to golang-nuts+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
