nthOr headOr lastOr

nthOr :: a -> Int -> [a] -> a
headOr :: a -> [a] -> a
lastOr :: a -> [a] -> a

Gives safe way of extracting a value from a list that can be empty, similar to propOr

[jethrolarson]

For the record, I’m still in support of ramda getting Maybe

[jethrolarson]

The head of a sparse array, that’s kinda zen. Like one hand clapping or something

On Tue, Apr 18, 2017, 8:31 AM Scott Sauyet [e-mail] wrote:

Nothing would indicate that the input was [].

That’s not at all clear to me. Nothing should indicate that the item supplied has no head. But what does that mean with a sparse array without a first element? Should ‘0’ in list; //=> false imply that head(list); //=> Nothing It’s a reasonable alternative.

I understand that since JS can return undefined as a value, the algebraic types need to be able to wrap it. But it becomes uncomfortable when sparse arrays are included. That’s one good reason that in Ramda we’ve always punted on them. But that’s probably not a luxury that Sanctuary can afford.

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