RosettaCodeData/Task/Apply-a-callback-to-an-array/APL/apply-a-callback-to-an-array.apl

    - 1 2 3
¯1 ¯2 ¯3
    2 * 1 2 3 4
2 4 8 16
    2 × ⍳4
2 4 6 8
    3 * 3 3 ⍴ ⍳9
   3    9    27
  81  243   729
2187 6561 19683