Module:table/listToSet - Revision history

Sware: 1 revision imported

2026-04-21T11:22:42Z

1 revision imported

← Older revision	Revision as of 11:22, 21 April 2026
(No difference)

Sware at 13:57, 25 November 2025

2025-11-25T13:57:42Z

← Older revision	Revision as of 13:57, 25 November 2025
(No difference)

wikt>Theknightwho at 03:09, 22 May 2025

2025-05-22T03:09:00Z

@@ Line 1: / Line 1: @@
---[[
+local fun_is_callable_module = "Module:fun/isCallable"
-	{ "a", "b", "c" } -> { ["a"] = true, ["b"] = true, ["c"] = true }
---]]
+local function is_callable(...)
-return function(t)
+	is_callable = require(fun_is_callable_module)
-	-- checkType("listToSet", 1, t, "table")
+	return is_callable(...)
+end
-	local set = {}
-	for _, item in ipairs(t) do
+--[==[
-		set[item] = true
+Convert `list` (a table with a list of values) into a set (a table where those values are keys instead). This is a useful way to create a fast lookup table, since looking up a table key is much, much faster than iterating over the whole list to see if it contains a given value.
 	end
 end

Sware: Created page with "--[[ { "a", "b", "c" } -> { ["a"] = true, ["b"] = true, ["c"] = true } --]] return function(t) -- checkType("listToSet", 1, t, "table") local set = {} for _, item in ipairs(t) do set[item] = true end return set end"

2023-07-29T13:39:12Z

Created page with "--[[ { "a", "b", "c" } -> { ["a"] = true, ["b"] = true, ["c"] = true } --]] return function(t) -- checkType("listToSet", 1, t, "table") local set = {} for _, item in ipairs(t) do set[item] = true end return set end"

New page

--[[
{ "a", "b", "c" } -> { ["a"] = true, ["b"] = true, ["c"] = true }
--]]
return function(t)
-- checkType("listToSet", 1, t, "table")

local set = {}
for _, item in ipairs(t) do
set[item] = true
end
return set
end