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Re: Useless use of string in return statement

by GrandFather (Saint)
on Apr 12, 2021 at 23:32 UTC ( [id://11131160]=note: print w/replies, xml ) Need Help??


in reply to Useless use of string in return statement

I get:

Possible precedence issue with control flow operator at noname.pl line
+ 23.
Useless use of string in void context at noname.pl line 23.

[download]

for the return $result{'message'} ... line, which makes sense. Remember or is low precedence so the compiler sees:

(return $result{'message'}) or "$result{'api-key'}:$result{'session'}"
+;

[download]

High precedence || would fix the problem

Update: note that I'm using Perl v5.32.0.

Optimising for fewest key strokes only makes sense transmitting to Pluto or beyond

Replies are listed 'Best First'.
Re^2: Useless use of string in return statement
by syphilis (Archbishop) on Apr 13, 2021 at 09:40 UTC
    I can never remember the rules of precedence, so I just remove the relevance of such considerations by using brackets to make my intentions clear: 
    C:\>perl -MO=Deparse,-p -e "return $x or $y"
((return $x) or $y);
-e syntax OK

C:\>perl -MO=Deparse,-p -e "return ($x or $y)"
(return ($x || $y));
-e syntax OK

    [download]
    Cheers,
    Rob
[reply]
[d/l]

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