Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris
 
PerlMonks  

Comment on

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

These interpolate:

  • "$var"
  • qq{$var}

These do not:

  • '$var'
  • q{$var}

TL;DR: if you want interpolation, don't use single quotes!

OK, I see what you're asking. You want delayed evaluation - I'll update with a solution to that momentarily!

Update: OK, how about this...

use v5.10; use strict; use warnings; sub delayed (&) { package delayed; use overload q[""] => sub { $_[0]->() }, fallback => 1; bless shift; } my $string = delayed {"Look $::person, no $::thing!"}; $::person = "Ma"; $::thing = "stringy eval"; say $string;

Update II (about a week later): I've released String::Interpolate::Delayed using some of the ideas explored in this thread.

package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

In reply to Re: Interpolation: when it occurs? another beginner question.. by tobyink
in thread Interpolation: when it occurs? another beginner question.. by Discipulus

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



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

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

    How do I use this? | Other CB clients
    Other Users?
    Others meditating upon the Monastery: (12)
    As of 2014-08-28 10:35 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The best computer themed movie is:











      Results (259 votes), past polls