Yes, autovivification is capricious. It would be a great improvement if it only happened in lvalue contexts (ordinary value contexts could simply short-circuit and return null). If I may add an adjective to your canonical list, I'd like to present The Simple: if Perl has to go through
(dereference) a reference to get to something, autovivification happens (obviously, it also happens if the reference is itself used in lvalue context).
The subject does, from time to time, come up here, as in Looping through a hash reference is creating a key...?.
Caution: Contents may have been coded under pressure.
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.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||