alt Hacker NewsDo you remember what it was? This is how I would spell that in BQN, and you could write something very similar in APL (you don't have shift, so you'd have to write 1 drop 0 cat swap instead)
((«¬∘∧⊢)' '=⊢)⊸/
Here's stepping through it with some input.
(' '=⊢) "this is a sentence with many spaces"
⟨ 0 0 0 0 1 1 0 0 1 0 1 1 0 0 0 0 0 0 0 0 1 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 1 1 1 0 0 0 0 0 0 ⟩
(«' '=⊢) "this is a sentence with many spaces"
⟨ 0 0 0 1 1 0 0 1 0 1 1 0 0 0 0 0 0 0 0 1 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 1 1 1 0 0 0 0 0 0 0 ⟩
((«∧⊢)' '=⊢) "this is a sentence with many spaces"
⟨ 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 1 1 0 0 0 0 0 0 0 ⟩
((«¬∘∧⊢)' '=⊢) "this is a sentence with many spaces"
⟨ 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 0 0 1 1 1 1 1 1 1 ⟩
((«¬∘∧⊢)' '=⊢)⊸/ "this is a sentence with many spaces"
"this is a sentence with many spaces"Replies
dzaima • yesterday at 4:15 PM
Some alternative spellings:
(¬∘∧⟜«' '=⊢)⊸/
(¬·«⊸∧' '=⊢)⊸/
{¬«⊸∧' '=x}⊸/ # should have double-struck x here (U+1D569), but hn removes it➕ show 1 reply
tosh • yesterday at 4:37 PM
in k:
s:"this is a sentence with many spaces"
s@&~0&':s=" "➕ show 1 reply
With an OR 2-scan, you can avoid the negation. Here's how I'd do it in APL: {⍵⌿⍨2∨⌿0⍪' '≠⍵}. In general, I find that boolean 2-scans pop up quite a bit in real-world APL usage. It's worth working through them. I have a short article [0] on the subject, if you're interested.
It's also worth thinking through how all 16 boolean operators work on boolean masks. E.g. what do msk≠msk2, msk<msk2, msk≤msk2 etc. mean? In my experience, the important part is to find crisp domain-specific meanings for these patterns. In general, really, that's how you gain APL fluency. In the same way that reading fluency requires chunking so that letters "disappear", APL fluency requires familiarity with semantic phrases, so you stop thinking in the individual symbols.
[0]:https://blog.wilsonb.com/posts/2023-07-24-suggestivity-and-i...