I'm surprised that I have never come across this as a way to create a slice
with an initial length:
x := []int{100:0}
On Tuesday, June 22, 2021 at 12:43:17 PM UTC-4 axel.wa...@googlemail.com
wrote:
> Oh and also:
>
> Likewise, I think this only works for array literals; I don’t think
>> (though again have not tried it) that you can declare slice literals with
>> only selected members initialized.
>
>
> Works fine too: https://play.golang.org/p/ANw54ShkTvY :)
>
> On Tue, Jun 22, 2021 at 6:41 PM Axel Wagner <axel.wa...@googlemail.com>
> wrote:
>
>> (I assume with a runtime rather than a compiler error, but I haven’t
>>> tried it)
>>
>>
>> Nope, compiler catches the overflow:
>> https://play.golang.org/p/taorqygqxFz
>>
>> On Tue, Jun 22, 2021 at 6:39 PM David Riley <frave...@gmail.com> wrote:
>>
>>> On Jun 22, 2021, at 11:39, Vaibhav Maurya <vaibha...@gmail.com> wrote:
>>>
>>>
>>> Hi,
>>>
>>> Please help me to understand the following syntax mentioned in the
>>> Golang language specification document.
>>>
>>> https://golang.org/ref/spec#Composite_literals
>>>
>>> following is the search string for CTRL + F
>>> // vowels[ch] is true if ch is a vowel \
>>>
>>> Following declaration and initialization is confusing.
>>> vowels := [128]bool{'a': true, 'e': true, 'i': true, 'o': true, 'u':
>>> true, 'y': true}
>>>
>>> Here one can see the vowels is an array. Where in the array
>>> initialization syntax, there is a key value pair. I believe *bool *is
>>> the primitive type, so the array values should be either true or false.
>>> Why there are key value pair separated by colon in the initialization.
>>>
>>>
>>> In this case, it is because the single quotes create a literal rune,
>>> which ultimately is an integer; this is creating an array 128 wide of
>>> bools, of which only the values indexed by those character values are
>>> initialized (everything else is the zero value, or false).
>>>
>>> This example only works for characters in the 7-bit ASCII subset of
>>> UTF-8; if you were to put other characters in which had rune values greater
>>> than 127, this would break (I assume with a runtime rather than a compiler
>>> error, but I haven’t tried it). Likewise, I think this only works for array
>>> literals; I don’t think (though again have not tried it) that you can
>>> declare slice literals with only selected members initialized.
>>>
>>>
>>> - Dave
>>>
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