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Very nice, concise overview. A couple of additional notes to keep in mind regarding here docs:

  • The end tag specifier must follow the << without any intermediate space.

    If the end tag is quoted explicitly (with either single or double quotes), spaces may be present:
    print << "ENDTAG"; # works print << 'ENDTAG'; # works print << ENDTAG; # syntax error!
  • Any leading spaces in the text of the here doc will be printed as such, which means using here docs in indented blocks gets messy:

    Non-indented code block
    print "printing here doc:\n"; print <<"ENDTAG"; This text has 0 leading spaces This text has 4 leading spaces ENDTAG OUTPUT: printing here doc: This text has 0 leading spaces This text has 4 leading spaces
    Indented code block (same output as above)
    { print "printing here doc:\n"; print <<"ENDTAG"; This text has 0 leading spaces This text has 4 leading spaces ENDTAG }
    But, if the printed text includes leading whitespace, spaces can be included as part of the end tag to clean up the code block:
    { print "printing here doc:\n"; print <<" ENDTAG"; This text has 4 leading spaces ENDTAG } OUTPUT: printing here doc: This text has 4 leading spaces
  • The Filter::Indent::HereDoc and Filter::HereDocIndent modules allow here docs to be used within indented code blocks without adding the leading whitespace from the indentation to the output.

  • In reply to Re: quotes in Perl by bobf
    in thread quotes in Perl by apotheon

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

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[1nickt]: I though the gamers like that because they bash the keys so hard.
[ambrus]: and I've seen motherboards with no fast expansion ports for a video card but built-in hardware RAID advertized as "gaming".
LanX has a shaming laptop
[ambrus]: 1nickt: my impression is that the gamers like the softer springs, because fast reaction time is more important to them then feedback from keypresses to recognize typos.
[1nickt]: Ah, I see. I did read some gamer mag reviews, and yes, they lamented the fact that laptops with no discrete video card are sold as "gaming" hardware.
[1nickt]: But, they do have red keyboard backlighting! And gargoyles on the front, or words like "Maxxx" here and there. They know their demographic!
[1nickt]: True gamers don;t buy Dells, HPs, or Lenovos, I think ;-)
[ambrus]: The keyboard I bought doesn't have backlighting. I specifically had to select for that, because so many keyboards these days have lights. Why would I want lights in the keyboard? I want lights in the room, such as on the ceiling, not in the keyboard.
choroba has a small USB lamp

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