diff options
Diffstat (limited to 'utils.lua')
| -rw-r--r-- | utils.lua | 24 |
1 files changed, 24 insertions, 0 deletions
@@ -91,6 +91,8 @@ utils = { start, stop, step = 1, start, 1 elseif step == nil then step = 1 + elseif step == 0 then + error("Range step cannot be zero.") end return setmetatable({ start = start, @@ -105,9 +107,31 @@ utils = { end end return iter, self, 0 + end, + __index = function(self, i) + if type(i) ~= "Number" then + return nil + end + if i % 1 ~= 0 then + return nil + end + if i <= 0 or i - 1 > (self.stop - self.start) / self.step then + return nil + end + return self.start + (i - 1) * self.step + end, + __len = function(self) + local len = (self.stop - self.start) / self.step + if len < 0 then + len = 0 + end + return len end }) end, + nth_to_last = function(list, n) + return list[#list - n + 1] + end, keys = function(t) local _accum_0 = { } local _len_0 = 1 |