[swift-evolution] [SHORT Review] SE-0133: Rename `flatten()` to `joined()`
jtbandes at gmail.com
Mon Jul 25 16:39:14 CDT 2016
On Mon, Jul 25, 2016 at 2:09 PM, David Rönnqvist <swift-evolution at swift.org>
> Haskell calls the general *m (m a) -> m a* function for "join", but also
> has a specialized *[[a]] -> [a]* function called "concat". (The function
> corresponding to "flatMap" is called "bind" in Haskell (although used as an
> operator), so since neither is called flatten or flatMap it doesn't have
> the confusion where one of them would be named so).
There's also mapMaybe
probably others. "concat" is just "concatMap id". Similarly, concatMap can
be seen as equivalent to bind with its arguments reversed, "flip (>>=)". I
personally find the plethora of similar functions confusing, but I'm not
totally fluent in Haskell's standard libraries.
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