ArrayPad¶ Pads a list on both sides with a filler value (0 by default). $ wo 'ArrayPad[{1, 2, 3}, 2]' {0, 0, 1, 2, 3, 0, 0} $ wo 'ArrayPad[{1, 2, 3}, 2, 0]' {0, 0, 1, 2, 3, 0, 0}