Choosing between enum arrays or AliasSeqs

[Nordlöw via Digitalmars-d-learn]

On Friday, 25 August 2017 at 08:27:41 UTC, Jacob Carlborg wrote:
> Since you're converting the returned index to a bool, can't you 
> use "canFind" instead?
>
> immutable englishIndefiniteArticles = [`a`, `an`];
> bool isEnglishIndefiniteArticle(S)(S s)
> {
>     return englishIndefiniteArticles.canFind(s);
> }

`s.canFind` has time-complexity O(s.length)

Opposite to the template-parameter overload of `among` which has 
O(1), making all the difference performance-wise in my case.