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| -rw-r--r-- | util/iterators.lua | 9 |
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 = {}; |