> I don't understand the point about real efficiency,

Maybe an example helps illustrating the point.

What is more efficient:

 for (1..1e6) { ... }

or

 @k=1..1e6; for (@k) {...} ?

> but if you want absolutely no dependencies,

I definitely need no dependency b/c this lazy iterator breaks if comparing identical hashes.

This seems like a trivially avoided case but, what if you working with deeply nested data-structures?

This effectively means:

NEVER use each within an iterator operating on a shared data structure, cause it has global side effects!

> you can always roll your own iterator.

I'm well aware, thats why asked how to avoid this.

Cheers Rolf

( addicted to the Perl Programming Language)

In reply to Re^4: Indepedent lazy iterators for the same hash? by LanX
in thread Indepedent lazy iterators for the same hash? by LanX

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.