develooper Front page | perl.perl5.porters | Postings from March 2021

Re: Perl::FeatureList and feature-list

Thread Previous | Thread Next
From:
Yuki Kimoto
Date:
March 14, 2021 23:38
Subject:
Re: Perl::FeatureList and feature-list
Message ID:
CAExogxOUmROH61i8R9suXJ5w06QnHRxVT2J=cETFVRvZOq5S=A@mail.gmail.com
It useful to have a version list of new features, especially often used.

For example

  5.14

    Regular Expression Ascii option

      $str =~ /\d/a


2021年3月14日(日) 0:47 <neilb@neilb.org>:

> While talking about what new[*] features are in Perl, and which are being
> used, what version they were introduced in, and whether they’re guarded, I
> wondered if there’s a single place where that information can be found.
> There’s perldoc feature, perldoc experimental, and perldeltas. And various
> online talks, and, …
>
> So I wondered if something analogous to Module::CoreList and corelist
> would be useful.
>
> I’ve hacked up a module Perl::FeatureList and a feature-list script. By
> default the script will display a concise summary of the new features in
> your perl. For example, if you’re running Perl 5.16.3, you’ll see this:
>
>   % feature-list
>
>   ---- new features available in perl 5.016003 ----
>   F  say               just like print, but adds a newline
>      defined-or        // is like || but on definedness rather than
> truthiness
>   F  state             lexically scoped variables with persistent values
>   X  switch            perlish switch statement
>   F  unicode_strings   tells compiler to use Unicode rules for all string
> ops
>   F  current_sub       enables __SUB__ token that refers to current
> subroutine
>   F  unicode_eval      makes string eval work more consistently with
> Unicode
>   F  evalbytes         adds an evalbytes keyword that operates on a byte
> stream
>   F  fc                enables fc(), which implements Unicode casefolding
>
> The first column says whether it’s built in, has a Feature guard, or is
> eXperimental.
> The -w switch gives a wide display, which for now just includes the
> version of Perl.
> By default it lists the more notable changes, but -a will display all
> changes.
> The —future switch will follow the first table with a table of features
> that
> have been introduced after your perl.
>
> If you give it a feature name, it will display a brief description of the
> feature.
>
> You can also ask for the changes in a specific release:
>
>   % feature-list 5.10.0
>
>   F  say             just like print, but adds a newline
>      defined-or      // is like || but on definedness rather than
> truthiness
>   F  state           lexically scoped variables with persistent values
>      named-capture   ability to name capture parens in a regex
>      UNITCHECK       code block run after enclosing unit has been compiled
>
> I’ve only just started going through the perldeltas, so a lot of changes
> are missing:
>
>     https://github.com/neilb/Perl-FeatureList
>
> Neil
>
> [*] In our discussions, we decided "new" means post-5.8
>

Thread Previous | Thread Next


nntp.perl.org: Perl Programming lists via nntp and http.
Comments to Ask Bjørn Hansen at ask@perl.org | Group listing | About