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shift/unshift

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Mark Pilgrim
2009-07-22 21:16:12 -04:00
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@@ -292,7 +292,7 @@ ZeroDivisionError: Fraction(0, 0)</samp></pre>
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<blockquote class='note compare perl'>
<p><span class=u>&#x261E;</span><code><var>a_list</var>.insert(0, <var>value</var>)</code> is like the <code>shift()</code> function in Perl. It adds an item to the beginning of the list, and all the other items have their positional index bumped up to make room.
<p><span class=u>&#x261E;</span><code><var>a_list</var>.insert(0, <var>value</var>)</code> is like the <code>unshift()</code> function in Perl. It adds an item to the beginning of the list, and all the other items have their positional index bumped up to make room.
</blockquote>
<p>Let&#8217;s look closer at the difference between <code>append()</code> and <code>extend()</code>.