I usually end up writing your 'lurkup' when I use maps, so I'd like see it included.
I don't have a better name than 'lookupWith'.
And, yeah, lookupDefault has not been useful in practice.
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On June 8, 2020 7:07:13 PM UTC, David Feuer
Discussion has gotten going again about harmonizing between the names findWithDefault and lookupDefault in containers and unordered-containers:
findWithDefault :: Ord k => a -> k -> Map k a -> a lookupDefault :: (Eq k, Hashable k) => a -> k -> HashMap k a -> a
I've been fairly unenthusiastic about adding extra names for this function in one package or the other, in large part because I don't like the function. I'd much rather have something in the spirit of `either`, `maybe`, `bool`, etc.:
lurkup :: Ord k => r -> (a -> r) -> k -> Map k a -> r lurkup r f k = maybe r f . lookup k lookup k = lurkup Nothing Just k
Unfortunately, I haven't been able to come up with a decent name for this function. Can anyone help?