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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Good point about, POLA.&nbsp; Of course, arguments.callee is
writable (and deletable)&nbsp; so it could be removed or modified before
passing it on.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>POLA is also the reason for preferring use of the Function
constructor over eval. The function constructor is essentially a constrained
eval that carries less authority.&nbsp; In particular, in non-strict mode eval can
create bindings in the Declaration Environment of its caller (or the Global
Environment) and in either mode it can modify any in scope bindings.&nbsp; More
generally, eval can execute arbitrary code and have arbitrary side-effects. None
of that applies to calling the Function constructor. &nbsp;Those seem like
really good reasons to encourage use of the Function constructor instead of
eval, where possible.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Allen<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Mark S. Miller
[mailto:erights@google.com] <br>
<b>Sent:</b> Tuesday, March 10, 2009 9:03 AM<br>
<b>To:</b> Allen Wirfs-Brock<br>
<b>Cc:</b> Douglas Crockford; David-Sarah Hopwood; es-discuss@mozilla.org<br>
<b>Subject:</b> Re: arguments.callee and strict mode<o:p></o:p></span></p>

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<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>On Tue, Mar 10, 2009 at 8:52 AM, Allen Wirfs-Brock &lt;<a
href="mailto:Allen.Wirfs-Brock@microsoft.com">Allen.Wirfs-Brock@microsoft.com</a>&gt;
wrote:<o:p></o:p></p>

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<p>In reviewing the spec. I was reminded that arguments.callee is disabled
within strict mode functions.&nbsp; Do you recall why you wanted to do this,
other than general dislike of arguments.<o:p></o:p></p>

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<p class=MsoNormal>POLA. A frequent and sensible pattern of use for
&quot;arguments&quot; is to pass it along to someone else to give them access
to your arguments list. In typical usage, it is not usually intended or desired
to thereby give them access to the function itself, not to give them the
ability to alter your parameter variables (hence the lack of joining).<br>
<br>
&nbsp;<o:p></o:p></p>

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<p>It occurs to me, that using arguments.callee is the only way&nbsp; to
express recursion within a function created using the Function constructor and
that use of the Function constructor (rather than eval) should probably be
encouraged for dynamically constructing functions from source code.<o:p></o:p></p>

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<p class=MsoNormal>Why? I was thinking exactly the opposite: That we should
encourage use of eval() rather than the Function constructor for dynamic
creation of functions. <o:p></o:p></p>

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<br>
-- <br>
&nbsp; &nbsp;Cheers,<br>
&nbsp; &nbsp;--MarkM<o:p></o:p></p>

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