Module:TableTools: Difference between revisions
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Line 38:
------------------------------------------------------------------------------------
function p.isNan(v)
return type(v) == 'number' and
end
Line 64:
-- removed, but otherwise the array order is unchanged.
------------------------------------------------------------------------------------
function p.removeDuplicates(
checkType('removeDuplicates', 1,
local isNan = p.isNan
local ret, exists = {}, {}
for _, v in ipairs(
if isNan(v) then
-- NaNs can't be table keys, and they are also unique, so we don't need to check existence.
Line 337:
--
-- Transposes the keys and values in an array. For example, {"a", "b", "c"} ->
-- {a = 1, b = 2, c = 3}. Duplicates are not supported (result values refer to
-- the index of the last duplicate) and NaN values are ignored.
------------------------------------------------------------------------------------
function p.invert(arr)
checkType("invert", 1, arr, "table")
local isNan = p.isNan
local map = {}
for i, v in ipairs(arr) do
if not isNan(v) then
map[v] = i
end
end
Line 355 ⟶ 358:
-- Creates a set from the array part of the table. Indexing the set by any of the
-- values of the array returns true. For example, {"a", "b", "c"} ->
-- {a = true, b = true, c = true}. NaN values are ignored as Lua considers them
-- never equal to any value (including other NaNs or even themselves).
------------------------------------------------------------------------------------
function p.listToSet(
checkType("listToSet", 1,
local isNan = p.isNan
local set = {}
for _,
if not isNan(v) then
set[
end
end
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