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Add unique list function

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It removes duplicate elements from a list.
This commit is contained in:
Ricardo M. Correia 2014-11-12 21:36:26 +01:00
parent 3b0fa60a98
commit 1fea5866ae
1 changed files with 10 additions and 0 deletions
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10
lib/lists.nix
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@ -223,4 +223,14 @@ rec {
crossLists = f: foldl (fs: args: concatMap (f: map f args) fs) [f]; crossLists = f: foldl (fs: args: concatMap (f: map f args) fs) [f];
# Remove duplicate elements from the list
unique = list:
if list == [] then
[]
else
let
x = head list;
xs = unique (drop 1 list);
in [x] ++ remove x xs;
} }