discard """
  output: "action 3 arg"
"""

import tables

proc action1(arg: string) =
  echo "action 1 ", arg

proc action2(arg: string) =
  echo "action 2 ", arg

proc action3(arg: string) =
  echo "action 3 ", arg

proc action4(arg: string) =
  echo "action 4 ", arg

var
  actionTable = {
    "A": action1,
    "B": action2,
    "C": action3,
    "D": action4}.toTable

actionTable["C"]("arg")