rm push/pop

examples/chess/chess.ce

@@ -49,7 +49,7 @@ function compute_valid_moves(from) {
       dest = grid.at(to)
       if (length(dest) && dest[0].colour == piece.colour) continue
       if (rules.canMove(piece, from, to, grid))
-        push(validMoves, to)
+        validMoves[] = to
     }
   }
 }