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Re: emacs evaluating

From: Michael Ekstrand
Subject: Re: emacs evaluating
Date: Sat, 07 Feb 2009 16:33:11 -0600
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.90 (gnu/linux)

Evans Winner <address@hidden> writes:
> address@hidden (Pascal J. Bourguignon) writes:
>     To compile a function: (byte-compile 'your-function) C-x
>     C-e
> I had never thought of this.  I think I really must not
> understand compilation very clearly.  I think I grasp that
> an entire file full of functions will load faster if it is
> compiled first, but what does interactively compiling a
> single function buy me?  Does it exist in a different form
> in the image when you do that?  Does it execute faster?
> (This is not a facetious question, by the way.)  Er, maybe
> it has to do with debugging macros or something...?

It doesn't buy you anything useful that I know of for interactive
experimentation.  Byte compilation is useful for speeding up loading of
large and relatively-immutable packages, but for experimenting using C-x
C-e (evaluate last expression) and the scratch buffer are rather
convenient.  Compiling also makes debugging more difficult, as the
debugger doesn't display overly useful information when it encounters
byte-compiled code.

- Michael

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