util.array: pluck: Support default value to avoid holes

1 files changed, 6 insertions, 2 deletions

diff --git a/util/array.lua b/util/array.lua
index 32d2d6a5..6e5c8383 100644
--- a/util/array.lua
+++ b/util/array.lua
@@ -134,9 +134,13 @@ function array_base.unique(outa, ina)
 	end);
 end
 
-function array_base.pluck(outa, ina, key)
+function array_base.pluck(outa, ina, key, default)
 	for i = 1, #ina do
-		outa[i] = ina[i][key];
+		local v = ina[i][key];
+		if v == nil then
+			v = default;
+		end
+		outa[i] = v;
 	end
 	return outa;
 end