Yes, i see,
thank you so much!
Could you please explain, why primes[6:6] okay, but primes[7:7] not? *:-)*
在 2019年3月7日星期四 UTC+8下午11:55:40，Robert Johnstone写道：
>
> 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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