Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical
 
PerlMonks  

Re^3: Warning while using ternary operator

by Athanasius (Abbot)
on Dec 16, 2013 at 12:49 UTC ( #1067325=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Warning while using ternary operator
in thread Warning while using ternary operator

where does $i ne 'one' is happening in my code ?

It isn’t! To see this, print out the values of $hash->{name} and $i:

#! perl use strict; use warnings; my $hash = {}; my $i = 'one'; print "\nOriginal code:\n\n"; ($i eq 'one') ? $hash->{'name'} = "hello"."world" : 'nothing'; printf "name: %s, i: %s\n", $hash->{name}, $i; print "\nBrowserUk's fix:\n\n"; $hash->{name} = ($i eq 'one') ? "hello" . "world" : 'nothing'; printf "name: %s, i: %s\n", $hash->{name}, $i;

Output:

22:46 >perl 801_SoPW.pl Useless use of a constant ("nothing") in void context at 801_SoPW.pl l +ine 21. Original code: name: helloworld, i: one BrowserUk's fix: name: helloworld, i: one 22:46 >

As you can see, the warning is printed before the script runs, because it’s a compile-time warning, as BrowserUk says. But in both cases, the result of the assignment is that $hash->{name} contains helloworld, showing that $i eq 'one' is true. What makes you think that $i becomes not equal to 'one'?

For the ternary operator, see perlop#Conditional-Operator.

Hope that helps,

Athanasius <°(((><contra mundum Iustus alius egestas vitae, eros Piratica,


Comment on Re^3: Warning while using ternary operator
Select or Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1067325]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (4)
As of 2015-07-03 16:51 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (54 votes), past polls