Software / code / prosody
Diff
util/array.lua @ 8017:ec7cab8e744d
util.array: Add method for filtering out duplicate values
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Fri, 31 Mar 2017 17:29:08 +0200 |
| parent | 7976:2a7ef5fcaa77 |
| child | 8521:6f5ce0f09f40 |
line wrap: on
line diff
--- a/util/array.lua Wed Mar 29 22:38:31 2017 +0200 +++ b/util/array.lua Fri Mar 31 17:29:08 2017 +0200 @@ -92,6 +92,18 @@ return outa; end +function array_base.unique(outa, ina) + local seen = {}; + return array_base.filter(outa, ina, function (item) + if seen[item] then + return false; + else + seen[item] = true; + return true; + end + end); +end + function array_base.pluck(outa, ina, key) for i = 1, #ina do outa[i] = ina[i][key];
