Post by choudanu4 in General Decker Question and Answer Thread

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I tried to use unless operator with side-effects, and I was surprised that it doesn't short circuit.

potato_card: deck.add["card" "potato"] unless deck.cards["potato"]

The above creates a new card regardless of whether a "potato" card exists. I was hoping that the left term would not be evaluated (a.k.a short-circuits) if the right term was not nil.

Is there a better (more idomatic) way to get this short circuit behavior? This is what I'm currently doing:

potato_card: if deck.cards["potato"] deck.cards["potato"] else deck.add["card" "potato"] end

Thank you!

Internet Janitor77 days ago(+3)

"unless" does not short-circuit; No operators in Lil do.

In this specific case I would probably write

if !deck.cards.potato deck.add["card" "potato"] end

and then subsequently use "deck.cards.potato". Even if you then also assign it to a variable, the end result is slightly shorter.

itch.io

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