Driver program to test above function
let mat = [ [ 1 , 2 , 3 , 4 , 5 ] , [ 6 , 7 , 8 , 9 , 10 ] , [ 11 , 12 , 13 , 14 , 15 ] , [ 16 , 17 , 18 , 19 , 20 ] ] ; antiSpiralTraversal ( mat . length - 1 , mat [ 0 ] . length - 1 , mat ) ;