How to check if a table has more than one value?
Is there a way I can check if a table has more than one value? Like for example
local table = {0,0}
check if table has more than 1 value then return true
or check if a table has more than 2 value then return true
if it's more than 2 like 3 then return false
How can I do this?
1 answer
If your table t is a list, then #t is the number of elements in the list.
print(#{}) --> 0
print(#{"a"}) --> 1
print(#{"a", "b"}) --> 2
print(#{"a", "b", "c"}) --> 3
You can compare the size to one to know if it has more than one element:
print(#{} > 1) --> false
print(#{"a"} > 1) --> false
print(#{"a", "b"} > 1) --> true
print(#{"a", "b", "c"} > 1) --> true
This will only work for lists.
Dictionaries, which use non-whole-number keys, don't get counted by #.
Lists which have nil "holes" in them (like {1, nil, 3}) may or may not count the nils; Lua allows the length of a list like {1, nil, 3} to be either 1 or 3 -- it's better to just not use # on such tables because the result is confusing.