99 questions/Solutions/15: Difference between revisions

Revision as of 22:28, 20 December 2010

(**) Replicate the elements of a list a given number of times.

repli :: [a] -> Int -> [a]
repli xs n = concatMap (replicate n) xs

or, in Pointfree style:

repli = flip $ concatMap . replicate

alternatively, without using the replicate function:

repli :: [a] -> Int -> [a]
repli xs n = concatMap (take n . repeat) xs

@@ Line 9: / Line 9: @@
 <haskell>
 repli = flip $ concatMap . replicate
+</haskell>
+alternatively, without using the <hask>replicate</hask> function:
+<haskell>
+repli :: [a] -> Int -> [a]
+repli xs n = concatMap (take n . repeat) xs
 </haskell>