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Comment by skocznymroczny | Hacker News Reader

Unless I am missing something, you can just use .length on a static array:

    int[5] a = [1,2,3,4,5];
    writeln(a.length); // 5

Someone on the D subreddit pointed that out as well. I didn't know it was available at compile time. I'll update the post. Thanks.

Is that available at compile time, though?

Yes

Oh neat, I'm still a dlang noob and only used it in Crafting Interpreters :)