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                             CHALLENGE 135

                                Andinus
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                               2021-10-22





Task 1 - Middle 3-digits
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  You are given an integer.

  Write a script find out the middle 3-digits of the given integer, if
  possible otherwise throw sensible error.

  ┌────
  │ Input: $n = 1234567
  │ Output: 345
  │
  │ Input: $n = -123
  │ Output: 123
  │
  │ Input: $n = 1
  │ Output: too short
  │
  │ Input: $n = 10
  │ Output: even number of digits
  └────


Raku
────

  Input's absolute value is taken because the sign is meaningless here.
  To get middle 3-digits we take 3 digits from `$n.chars div 2 - 1'
  position, `-1' because Arrays are 0-indexed. It's guaranteed that we
  have odd number of digits so `div 2' will land us on left of middle
  digit, we just take 3 digits from there.

  ┌────
  │ $n = abs $n;
  │ die "too short" if $n.chars < 3;
  │ die "even number of digits" if $n.chars %% 2;
  │ put $n.substr($n.chars div 2 - 1, 3);
  └────