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-rw-r--r--util/iterators.lua9
1 files changed, 9 insertions, 0 deletions
diff --git a/util/iterators.lua b/util/iterators.lua
index 5f03bd10..bd150ff2 100644
--- a/util/iterators.lua
+++ b/util/iterators.lua
@@ -54,6 +54,15 @@ function it.values(t)
end, t;
end
+-- Iterate over the n:th return value
+function it.select(n, f, s, var)
+ return function (_s)
+ local ret = pack(f(_s, var));
+ var = ret[1];
+ return ret[n];
+ end, s, var;
+end
+
-- Given an iterator, iterate only over unique items
function it.unique(f, s, var)
local set = {};