G'day jsteng,

If you create all tags once and they're stable, you could create a hash and then use exists: 

my %tag_for = map { $_ => 1 } $text->tagNames;
... later ...
if (exists $tag_for{$j}) { ... }

[download]

If your tags are in constant flux (i.e. being added and removed) you could use grep to check for existence: 

if (grep $_ eq $j, $text->tagNames) { ... }

[download]

If you used last in your foreach loop for efficiency reasons, take a look at List::Util::first. You might want to Benchmark though: first only allows the "function BLOCK LIST" format: 

first { $_ eq $j } $text->tagNames

[download]

grep allows that format as well as the "function EXPR, LIST" format (which I've shown above). The BLOCK style is typically slower than the EXPR style (certainly for grep, map, and maybe others).

By the way, I'm not aware of any built-in method like: 

$text->does_tag_exist($tag_name)

[download]

but perhaps someone else does.

— Ken

In reply to Re: checking existence of a tag in a TK::Text? by kcott
in thread checking existence of a tag in a TK::Text? by jsteng

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!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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, details, 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, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            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.