Re: Having "in" for arrays
On Wednesday, 22 November 2017 at 10:32:48 UTC, lobo wrote:
On Wednesday, 22 November 2017 at 09:36:43 UTC, Dukc wrote:
On Wednesday, 22 November 2017 at 08:03:50 UTC, Fra Mecca
wrote:
void main()
{
auto v = ["r", "i", "o"];
assert ("r" in v);
}
Also note that even if it wereimplemented, you search for 'r'
instead of "r". "r" is a string, but you would want to search
for a char.
Isn't 'v' an array of strings? If it were a array of chars,
then the search would be 'r'.
bye,
lobo
Oops, you're correct. My bad.
Re: Having "in" for arrays
On Wednesday, 22 November 2017 at 09:36:43 UTC, Dukc wrote:
On Wednesday, 22 November 2017 at 08:03:50 UTC, Fra Mecca wrote:
void main()
{
auto v = ["r", "i", "o"];
assert ("r" in v);
}
Also note that even if it wereimplemented, you search for 'r'
instead of "r". "r" is a string, but you would want to search
for a char.
Isn't 'v' an array of strings? If it were a array of chars, then
the search would be 'r'.
bye,
lobo
Re: Having "in" for arrays
On Wednesday, 22 November 2017 at 08:03:50 UTC, Fra Mecca wrote:
void main()
{
auto v = ["r", "i", "o"];
assert ("r" in v);
}
Also note that even if it wereimplemented, you search for 'r'
instead of "r". "r" is a string, but you would want to search for
a char.
Re: Having "in" for arrays
On Wednesday, November 22, 2017 08:03:50 Fra Mecca via Digitalmars-d-learn
wrote:
> Why doesn't D have a in keyword for arrays?
>
> The docs explains that you can use in only for associative arrays
> but I don't see the reasons for such decision.
>
>
> Example code:
>
> void main()
> {
> auto v = ["r", "i", "o"];
> assert ("r" in v);
> }
>
>
> That currently fails:
> main.d(4): Error: incompatible types for (("r") in (v)): 'string'
> and 'string[]'
in is supposed to be at worst O(log n), whereas to do the operation for an
array would be O(n). If you want to search for a specific element in an
array than use std.algorithm.find or std.algorithm.canFind.
- Jonathan M Davis
