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Programming-Idioms

  • C#
  • Scheme

Idiom #257 Traverse list backwards

Print each index i and value x from the list items, from the last down to the first.

(define (reversed-inspect items)
  (foldl (lambda (x i)
          (display (format "~a ~a\n" i x))
          (sub1 i))
         (sub1 (length items))
        (reverse items)))
for(int i = items.Count - 1; i >= 0; i--)
{
    Console.WriteLine($"Index = {i}, Item = {items[i]}");
}
var i = items.length ;
for (var e in items.reversed) {
  i--;
  print("$i, $e");
}

New implementation...
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