about "say" function

lightoverhead has asked for the wisdom of the Perl Monks concerning the following question:

I may have a silly question.

I tried to directly use "say" function of perl without declaring "use v5.1x".

What should I do to achive this? Why the "say" function cannot be directly used?

my perl is:

This is perl 5, version 18, subversion 2 (v5.18.2) built for x86_64-li
+nux-gnu-thread-multi
[download]

Thanks.

Comment on about "say" function Download Code

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Re: about "say" function by kennethk (Abbot) on Aug 12, 2014 at 16:57 UTC
The say function is not imported into the main namespace (Packages) by default. The shortest chain to importing it is via the feature pragma: `use feature 'say';`. `say` was implemented in Perl v5.10, but if it was imported by default, there would be the risk of backward compatibility problems and spurious warnings for perfectly fine old code. Alternatively, you can use `say` without importing it by giving the full package: `CORE::say();`. #11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.	[reply] [d/l] [select]
Re^2: about "say" function by lightoverhead (Pilgrim) on Aug 12, 2014 at 17:18 UTC
kennethk Thank you for your prompt response. Actually, I have been wondering why "say" was not imported be default if this is a better feature and upgrade. Similar situations for smart comparision operators...	[reply]
Re^3: about "say" function by ikegami (Patriarch) on Aug 12, 2014 at 18:16 UTC
For backwards compatibility with program/modules that have a sub/method called `say`. You do not need to enable a feature to use the smart match operator. You do for `given` and `when`, though, for the same reason as `say`.	[reply] [d/l] [select]
Re^4: about "say" function by adefaria (Beadle) on Aug 13, 2014 at 15:01 UTC
Re^5: about "say" function by kennethk (Abbot) on Aug 13, 2014 at 15:05 UTC
Re^5: about "say" function by AppleFritter (Vicar) on Aug 13, 2014 at 17:16 UTC
Re^5: about "say" function by ikegami (Patriarch) on Aug 13, 2014 at 19:20 UTC
Re: about "say" function by aitap (Curate) on Aug 12, 2014 at 17:18 UTC
Adding to the previous answer, you can use -E flag to use say (and all other features) in your one-oners.	[reply]


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