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Task/Straddling-checkerboard/11l/straddling-checkerboard.11l

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+V t = [[String(‘79’), ‘0’, ‘1’, ‘2’, ‘3’, ‘4’, ‘5’, ‘6’, ‘7’, ‘8’, ‘9’],
+       [String(‘’),   ‘H’, ‘O’, ‘L’, ‘’,  ‘M’, ‘E’, ‘S’, ‘’,  ‘R’, ‘T’],
+       [String(‘3’),  ‘A’, ‘B’, ‘C’, ‘D’, ‘F’, ‘G’, ‘I’, ‘J’, ‘K’, ‘N’],
+       [String(‘7’),  ‘P’, ‘Q’, ‘U’, ‘V’, ‘W’, ‘X’, ‘Y’, ‘Z’, ‘.’, ‘/’]]
+
+F straddle(s)
+   R multiloop_filtered(Array(s.uppercase()), :t, (c, l) -> c C l, (c, l) -> l[0]‘’:t[0][l.index(c)]).join(‘’)
+
+F unstraddle(s)
+   [String] r
+   V si = 0
+   F next()
+      R @s[@si++]
+   L
+      I si == s.len
+         L.break
+      V c = s[si++]
+      I c C (:t[2][0], :t[3][0])
+         V i = [:t[2][0], :t[3][0]].index(c)
+         V n = :t[2 + i][:t[0].index(next())]
+         r [+]= I n == ‘/’ {next()} E n
+      E
+         r [+]= :t[1][:t[0].index(c)]
+   R r
+
+V O = ‘One night-it was on the twentieth of March, 1888-I was returning’
+print(‘Encoded: ’straddle(O))
+print(‘Decoded: ’unstraddle(straddle(O)).join(‘’))