Utilities: Add simple utility code to work with arrays and Lua tables

utils.lua

@@ -0,0 +1,37 @@
+-- Basic utilities to work with array operations in Lua
+-- By Zorman2000
+
+npc.utils = {}
+
+function npc.utils.array_contains(array, item)
+	--minetest.log("Array: "..dump(array))
+	--minetest.log("Item being searched: "..dump(item))
+	for i = 1, #array do
+		--minetest.log("Equals? "..dump(array[i] == item))
+		if array[i] == item then
+			return true
+		end
+	end
+	return false
+end
+
+function npc.utils.array_is_subset_of_array(set, subset)
+	local match_count = 0
+	for j = 1, #subset do
+		for k = 1, #set do
+			if subset[j] == set[k] then
+				match_count = match_count + 1
+			end
+		end
+	end
+	-- Check match count
+	return match_count == #subset
+end
+
+function npc.utils.get_map_keys(map)
+	local result = {}
+	for key, value in pairs(map) do
+		table.insert(result, key)
+	end
+	return result
+end