added tablex.compact to compact sequential tables of a known range containing nils

This commit is contained in:
Max Cahill 2022-07-19 15:58:15 +10:00
parent 24fde1c157
commit 44c6ae1b0a

View File

@ -277,6 +277,33 @@ function tablex.values(t)
return r
end
--collect all values over a range into a new sequential table
--useful where a range may have been modified to contain nils
-- range can be a number, where it is used as a numeric limit (ie [1-range])
-- range can be a table, where the sequential values are used as keys
function tablex.compact(t, range)
local r = {}
if type(range) == "table" then
for _, k in ipairs(range) do
local v = t[k]
if v then
table.insert(r, v)
end
end
elseif type(range) == "number" then
for i = 1, range do
local v = t[i]
if v then
table.insert(r, v)
end
end
else
error("tablex.compact - range must be a number or table", 2)
end
return r
end
--append sequence t2 into t1, modifying t1
function tablex.append_inplace(t1, t2, ...)
for i, v in ipairs(t2) do