If you're consciously and intentionally using JavaScript like that, I don't want to be friends with you.
this post was submitted on 04 Jun 2025
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This is my favorite language: GHC Haskell
GHC Haskell:
GHCi> length (2, "foo")
1
Wait, now I need to know why.
* some time later *
I went to check why the hell this happened. It looks like the pair ("(,)") is defined as an instance of Foldable, for some reason, which is the class used by functions like foldl() and foldr(). Meanwhile, triples and other tuples of higher order (such as triples, quadruples, ...) are not instances of Foldable.
The weirdest part is that, if you try to use a pair as a Foldable, you only get the second value, for some reason... Here is an example.
ghci> foldl (\acc x -> x:acc) [] (1,2)
[2]
This makes it so that the returned length is 1.
Oddly enough, in Haskell (as defined by the report), length is monomorphic, so it just doesn't work on tuples (type error).
Due to the way kinds (types of types) work in Haskell, Foldable instances can only operate over (i.e. length only counts) elements of the last/final type argument. So, for (,) it only counts the second part, which is always there exactly once. If you provided a Foldable for (,,,) it would also have length of 1.
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(4 replies)
It's because + is two different operators and overloads based on the type to the left, while - is only a numeric operator and coerces left and right operands to numeric. But frankly if you're still using + for math or string concatenation in 2025, you're doing it wrong.
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(5 replies)
Feels like it could be one of those facebook posts to test "smart" people. Only the top 1% of people can answer this simple math question: "11" + 2 * 2 - 3
It's my favorite language too, but I also find this hilarious.