In Perl, you can achieve the maximum of programming effect with the minimum of code, though whether it's wise to do so in every circumstance is open to question. One of the most innovative approaches that Perl takes to saving coding is "topicalization", where functions and operators that are not supplied with an explicit parameter telling them on which data they should operate act on a special variable called $_ - or the default input and pattern matching space. It might sound complicated, but it isn't once you get used to it - so on our Perl courses we explain Topicalisation and $_, then we demonstrate it. Then we set our trainees a practical through which they can try it for themselves, with assistance from the tutor if necessary.

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More about shorthands in Perl

Associated topic - More about the Perl Environment

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