Beefy Boxes and Bandwidth Generously Provided by pair Networks
Problems? Is your data what you think it is?
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

Writing a program to rename copied photos throughout several folders I am using several greps, at one stage I needed to filter a folder, rather than add another layer of grep I placed an if conditional inside an anonymous list constructor, and discovered that the ?: tertiary conditional may not actually be a synonym for if.

There is most likely a simple reason why the if statement(term/expression?) produces a syntax error if used inside a refto/list constructor, but I wondered if this was due to greater reason than being condusive to writing better code? (as in, hint: use if to control flow not determine variables)

from my examples here, I summise that the tertiary conditional is an if statement(term/expression), wrapped in a do block. Is this the case?

my @arr = ( if(1<2){'1'}else{()} ); #syntax error my $arrref = \( if(1<2){'1'}else{()} ); #syntax error my $arrref2 = [ 1<2 ? '1' : () ]; #works my @arr2 = ( do { if(1<2){'1'}else{()} } ); #works if(1<2){print '1',$/ }else{print '2',$/}; #works 1<2 ? print '1',$/ : print '2',$/; #works ( 1<2 ? print '1',$/ : print '2',$/ ); #works ( if(1<2){print '1',$/ }else{print '2',$/} ); #syntax error

In reply to conditional statements in list constructors by Don Coyote

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others romping around the Monastery: (5)
As of 2022-05-27 15:13 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Do you prefer to work remotely?



    Results (95 votes). Check out past polls.

    Notices?