“Referencing” is a drop-dead simple idea, actually: a reference is “a tiny thing” that refers to something else in memory. That thing which is referred-to may be big or small, and there may be just one reference to it or a great many. But each reference is very small and cheap. So, for example, if you have in-memory a list of “big records,” you can swap and manipulate and what-have-you those records just by playing around with lists (or arrays, or hashes) of references to them: nothing actually “moves.” This lets you build up arbitrarily-complex data structures very easily, and to work with them very efficiently. (Want to sort the same list of records by three separate keys at once, all in-memory, keeping all three lists, without making duplicate copies of anything? Feel Free.™) It’s one of the hallmarks of Perl and one of the compelling reasons for using this language.
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:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- 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
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||