'Massive' Ongoing Changes to Perl Help It Move Beyond Its Unix Roots

Perl's major version number hasn't changed since 1994, notes a new blog post at Stack Overflow by Perl book author Dave Cross. Yet the programming language has still undergone "massive changes" between version 5.6 (summer of 2000) and version 5.36 (released this May). But because the Perl development strives for backwards compatibility, "many new Perl features are hidden away behind feature guards and aren't available unless you explicitly turn them on...."You're no doubt familiar with using print() to display data on the console or to write it to a file. Perl 5.10 introduced the say() command which does the same thing but automatically adds a newline character to the output. It sounds like a small thing, but it's surprisingly useful. How many times do you print a line of data to a file and have to remember to explicitly add the newline? This just makes your life a little bit easier.... Some of the improvements were needed because in places Perl's Unix/C heritage shows through a little more than we'd like it to in the 21st century. One good example of this is bareword filehandles... It is a variable. And, worst than that, ita(TM)s a package variable (which is the closest thing that Perl has to a global variable)... [But] for a long time (back to at least Perl 5.6), it has been possible to open filehandles and store them in lexical variables... For a long time, Perl's standard functions for dealing with dates and times were also very tied to its Unix roots. You may have seen code like this: my @datetime = localtime(); The localtime() function returns a list of values that represent the various parts of the current local time... Since Perl 5.10, the standard library has included a module called Time::Piece. When you use Time::Piece in your code, it overrides localtime() and replaces it with a function that returns an object that contains details of the current time and date. That object has a strftime() method... And it also has several other methods for accessing information about the time and date [including a method called is_leap_year]... Using Time::Piece will almost certainly make your date and time handling code easier to write and (more importantly) easier to read and understand.... In most languages you'd have a list of variable names after the subroutine name and the parameters would be passed directly into those. Well, as of version 5.36 (which was released earlier this summer) Perl has that too. You turn the feature on with use feature 'signatures'.... Subroutine signatures have many other features. You can, for example, declare default values for parameters. And new features possibly coming soon incude a new object-oriented programming framework named Corinna being written into the Perl core. "Beyond that, the Perl development team have their eye on a major version number bump." And to avoid confusion with Raku - the offshoot programming language formerly known as Perl 6 - the next major version of Perl will be Perl 7.

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