Quoting HOP, [prototyping means that]:

when we write this:
  Iterator { ... }
Perl behaves as though we had written:
  Iterator(sub { ... })

It allows the passing of a code reference to the Iterator subroutine, and is elsewhere compared to map { ... } @array and grep { ... } @array.

In reply to Re^5: "a bit of sugar "(HOP) by hbm
in thread "a bit of sugar "(HOP) by Wiggins

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