1 files changed, 7 insertions, 5 deletions
diff --git a/src/utils.lua b/src/utils.lua
index 29c3024..33ca7e8 100644
--- a/src/utils.lua
+++ b/src/utils.lua
@@ -18,6 +18,12 @@ function min(a, b)
   return b
 end
 
+function pop(tbl)
+  local last = tbl[#tbl]
+  tbl[#tbl] = nil
+  return last
+end
+
 function normalize(x, y)
   if x == 0 and y == 0 then
     return 0, 0
@@ -38,11 +44,7 @@ function dist(x1, y1, x2, y2)
   return (dx*dx + dy*dy)^0.5
 end
 
-mathx = {}
-
-mathx.tau = math.pi * 2
-
-function mathx.sign(x)
+function sign(x)
   if x == 0 then
     return 0
   end