Hashes, on the other hand, are intrinsically not ordered internally. In fact, this feature is what allows for (relatively) inexpensive insertion and deletion. (Two items with keys very close to each other are likely to end up in different areas of the hash table.)
That's not correct. Hash keys are ordered, otherwise you wouldn't be able to quickly search for them (and hence, no quick deletion either). However, the order internally isn't the same order people want (this thread seems to consider "ordered hashes" as "keys are sorted" - it's not uncommon for people to mean "keys returned in insertion order" when they talk about "ordered hashes"). I've always understood that keys (and its friends) return the keys in the way they are laid out internally - so certainly "ordered", but only after applying a hash function.

In reply to Re^2: What makes an array sorted and a hash unsorted? by JavaFan
in thread What makes an array sorted and a hash unsorted? by ikegami

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.