Software / code / prosody
Changeset
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 |
| parents | 8016:9546c629289b |
| children | 8018:9545d0a9401f |
| files | util/array.lua |
| diffstat | 1 files changed, 12 insertions(+), 0 deletions(-) [+] |
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--- 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];
