Hello,
When you use the colon, you taking a subset of the data. Further, the
notation is a closed/open. So a slice primes[6:6] is all of the element in
the array with index >= 6 and index < 6, which is an empty set. Note that
the type of the expression primes[6:6] is []int.
When you don't use the colon, you are access a specific element. Since the
count is zero based, the valid indices are 0 through 5 inclusive. Note
that the type of the expression primes[6] is simply int.
Good luck.
On Thursday, 7 March 2019 10:32:04 UTC-5, Halbert.Collier Liu wrote:
>
> Hi.
>
> The code like below:
>
> package main
>
> import "fmt"
>
> func main() {
> primes := [6]int{2, 3, 5, 7, 11, 13}
> fmt.Println(primes[6:6]) . // *OK*. return: []
> //fmt.Println(primes[6]) . // fail. out of bounds...
> }
>
> Why?
>
> Is the golang grammatical feature? or anything else..
>
> Any help, please!
>
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