View source for Module:Yesno

-- This is a simplified, Lua-only replacement for the template {{yesno}}. It provides a consistent
-- interface for users entering boolean or boolean-style input.
return function (val, default)
    val = type(val) == 'string' and mw.ustring.lower(val) or val -- put in lower case
    if not val or val == 'no' or val == 'n' or val == 'false' or tonumber(val) == 0 then
        return false
    elseif val == true or val == 'yes' or val == 'y' or val == 'true' or tonumber(val) == 1 then
        return true
    elseif default ~= nil then
        return default
    else
        return true
    end
end
Description	What you type	What you get
Italic	''Italic text''	Italic text
Bold	'''Bold text'''	Bold text
Bold & italic	'''''Bold & italic text'''''	*Bold & italic text*