Software / code / prosody
Changeset
7355:4b4cf0167391
util.iterators: Add iterator wrapper that works like select(n, ...) applied to original iterator
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Fri, 15 Apr 2016 13:20:31 +0200 |
| parents | 7354:8ca7f1c2c660 |
| children | 7356:f4d51870d212 7374:3e8851b7c6e8 |
| files | util/iterators.lua |
| diffstat | 1 files changed, 9 insertions(+), 0 deletions(-) [+] |
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--- a/util/iterators.lua Fri Apr 15 13:19:20 2016 +0200 +++ b/util/iterators.lua Fri Apr 15 13:20:31 2016 +0200 @@ -54,6 +54,15 @@ 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 = {};
