std.algorithm.canFind behavior difference between arrays and elements
Arun Chandrasekaran
aruncxy at gmail.com
Fri Dec 7 19:13:37 UTC 2018
On Friday, 7 December 2018 at 19:08:05 UTC, Arun Chandrasekaran
wrote:
> On Friday, 7 December 2018 at 18:57:48 UTC, Dennis wrote:
>> On Friday, 7 December 2018 at 18:51:27 UTC, Arun
>> Chandrasekaran wrote:
>>> Why is there a difference in the behavior?
>>
>> Your first assert expression is looking for a string in a
>> larger string, your second expression looks for hay which is
>> not a string but a string[]. To flatten the array, use:
>>
>> assert(canFind(hay.join, "111"));
>
> This succeeds.
>
> assert(canFind(hay, "aaa222aaa"));
>
> So the difference in the behaviour is caused by canFind
> checking for equality when string[] is passed. Is this the
> expected behaviour? I wouldn't want to join the array, for the
> array could be really big.
Actually, canFind documentation is perfect.
https://dlang.org/phobos/std_algorithm_searching.html#.canFind
assert( canFind!((string a, string b) => a.startsWith(b))(words,
"bees"));
Thanks for the help anyways!
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