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POWhat is the Perl version of a Python iterator?
 

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    <p>I am learning Perl at my work and enjoying it. I usually do my work in Python but boss wants Perl. </p> <p>Most of the concepts in Python and Perl match nicely: Python dictionary=Perl hash; Python tuple=Perl list; Python list=Perl array; etc. </p> <p>Question: Is there a Perl version of the Python form of an <a href="http://docs.python.org/library/stdtypes.html#iterator-types" rel="noreferrer">Iterator</a> / Generator? </p> <p>An example: A Classic Python way to generate the Fibonacci numbers is: </p> <pre><code>#!/usr/bin/python def fibonacci(mag): a, b = 0, 1 while a&lt;=10**mag: yield a a, b = b, a+b for number in fibonacci(15): print "%17d" % number </code></pre> <p>Iterators are also useful if you want to generate a subsection of a much larger list as needed. Perl 'lists' seem more static - more like a Python tuple. In Perl, can <code>foreach</code> be dynamic or is only based on a static list?</p> <p>The Python form of Iterator is a form that I have gotten used to, and I do not find it documented in Perl... Other than writing this in loops or recursively or generating a huge static list, how do I (for ex) write the Fibonacci subroutine it in Perl? Is there a Perl <code>yield</code> that I am missing? </p> <p>Specifically -- how do I write this:</p> <pre><code>#!/usr/bin/perl use warnings; use strict; # yes -- i use those! sub fibonacci { # What goes here other than returning an array or list? } foreach my $number (fibonacci(15)) { print $number . "\n"; } </code></pre> <p>Thanks in advance to being kind to the newbie...</p>
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