Ah, so, number are immutable because the literals are, and string are mutable because variables holding the strings are.

Right.

Maybe it would have been better if I had talked about hashes being mutable and numbers being immutable.
Same problem.

You're only able to modify a hash by stuffing it into a variable - but once you do that, numbers are mutable as well.

Anything that can appear on the LHS of an assignment is mutable (although the reverse doesn't automatically follow). Now, one can argue that there are no hash literals (they're either lists, or hashrefs), but that invalidate my arguments.

In reply to Re^12: The fallacy of the *requirement* for read-only instance variables. by JavaFan
in thread The fallacy of the *requirement* for read-only instance variables. by BrowserUk

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.