Context is a pretty important, pervasive concept in Perl. So much so that chromatic discusses it in the very first chapter[1] of his Modern Perl book[2].

    [1]: http://modernperlbooks.com/books/modern_perl_2014/01-perl-philosophy.html#Q29udGV4dA
    [2]: This very accessible, and free, book (updated very recently for 2014) is a must-read for any Perl developer.