http://d.puremagic.com/issues/show_bug.cgi?id=8715
Summary: zipWith Product: D Version: D2 Platform: All OS/Version: All Status: NEW Severity: enhancement Priority: P2 Component: Phobos AssignedTo: nob...@puremagic.com ReportedBy: bearophile_h...@eml.cc --- Comment #0 from bearophile_h...@eml.cc 2012-09-23 15:52:06 PDT --- I suggest to add the higher order function "zipWith" to Phobos, similar to the Haskell function present in the Prelude: Prelude> zipWith (+) [1,2,3] [10,20,30] [11,22,33] Prelude> data Vec = Vec Int Int deriving (Show) Prelude> zipWith Vec [1,2,3] [10,20,30] [Vec 1 10,Vec 2 20,Vec 3 30] As you see it's handy in two use cases: the first case is a zip that applies a given function to the pairs. The other important use case is when you don't need zip() to build an iterable of generic tuples, but you want it to build a range of a specific given struct/tuple. The Haskell code in D using the current Phobos: import std.algorithm, std.range; void main() { auto r1 = zip([1,2,3], [10,20,30]).map!(p => p[0] + p[1])(); static struct Vec { int x, y; } auto r2 = zip([1,2,3], [10,20,30]).map!(p => Vec(p.tupleof))(); } With a zipWith() the code becomes simpler and more readable: import std.range; void main() { auto r1 = zipWith!q{a + b}([1,2,3], [10,20,30]); static struct Vec { int x, y; } auto r2 = zipWith!Vec([1,2,3], [10,20,30]); } -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------