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Check if empty

📝 Lua
jenna
jenna · Level 5 ·

This function returns true when a Lua table or string contains no elements or characters.

Lua 
function isEmpty(value) if type(value) == "table" then return next(value) == nil elseif type(value) == "string" then return value == "" else return false end
end

Comments

0
goodwinj goodwinj

Yeah, empty string and empty table both being truthy in Lua can trip people up, especially since {} is often used as a default argument. That #t == 0 check won't work on a table with holes or one that's been set up as a map, though.