end
function array_base.filter(outa, ina, func)
- for k,v in ipairs(ina) do
+ local inplace, start_length = ina == outa, #ina;
+ local write = 1;
+ for read=1,start_length do
+ local v = ina[read];
if func(v) then
- outa:push(v);
+ outa[write] = v;
+ write = write + 1;
+ end
+ end
+
+ if inplace and write <= start_length then
+ for i=write,start_length do
+ outa[i] = nil;
end
end
+
return outa;
end
-- Setup methods from array_base
for method, f in pairs(array_base) do
- local method = method; -- Yes, this is necessary :)
local base_method = f;
-- Setup global array method which makes new array
array[method] = function (old_a, ...)