just printing the value of the assignment is normally no different from just printing the rhs, so what's the point?
It's all about context. Just print
ing the RHS evaluates it in list context. The assignment to $=
(an unused global variable) forces the assignment to occur in scalar context.
And there's the trick: evaluating a list assignment in scalar context returns the number of items that are (or would be) assigned.
That is why this snippet works to print the number of lines of input.
The 6th Rule of Perl Club is -- There is no Rule #6.
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:
Outside of code tags, you may need to use entities for some characters:
- 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.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||