[Date Prev][Date Next][Thread Prev][Thread Next]
- Subject: Re: Standard Libraries: (was: and Lua marches on)
- From: Tony Finch <dot@...>
- Date: Thu, 17 Dec 2009 13:43:06 +0000
On Thu, 17 Dec 2009, steve donovan wrote:
> And then consider the useful map2(fun,t1,t2) where fun takes two
> arguments, the corresponding values from t1 and t2.
Traditional functional libraries don't have a map2() function since
it can be trivially defined as something like:
In functional languages there's a tension between curried and uncurried
functions here, since map() and zip() are commonly defined in curried
style but f() must be uncurried, taking its arguments in a tuple
constructed by zip().
I suppose in Lua this translates to passing arguments in the usual way or
in a table. In this case the rough Lua equivalents of curry() and
uncurry() are unpack() and select().
f.anthony.n.finch <email@example.com> http://dotat.at/
GERMAN BIGHT HUMBER: SOUTHWEST 5 TO 7. MODERATE OR ROUGH. SQUALLY SHOWERS.
MODERATE OR GOOD.