1 files changed, 10 insertions, 0 deletions
diff --git a/util.lua b/util.lua
index 5fd41d3..8f1de2a 100644
--- a/util.lua
+++ b/util.lua
@@ -57,6 +57,16 @@ function filter(a, pred)
     return filtered
 end
 
+function keys(t)
+    ks = {}
+    i = 1
+    for k, v in pairs(t) do
+        ks[i] = k
+        i += 1
+    end
+    return ks
+end
+
 function fmt(x, depth)
     depth = depth or 1
     if (depth > 4) then return "STACK_OVERFLOW" end