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    <blockquote> <p>There must be a reason other than just saving time -- what is it?</p> </blockquote> <p>No, there isn't. I mean, there <em>never</em> is: the <em>whole reason</em> to use a computer at all is to save time. There's nothing a computer can do that you can't do by hand. It just takes a little longer.</p> <p>In this case, I wouldn't dismiss "a few seconds", given that it's one of the things I do more often than anything else, all day long, for my entire programming career. A few seconds to recompile, a few seconds to re-run, several seconds to recreate the state my program had the previous time -- even on a fast workstation, it can easily be a minute between iterations. (It used to be much worse, but faster hardware has only made it less-awful, not good. Whole-file-or-worse recompiles are I/O-bound, and may never* match the speed of more granular compilation.)</p> <p>In Lisp, recompiling a single function in an already-running process is almost instantaneous (I've never seen it even 0.1 sec, even on my 5-year-old laptop), and restarts mean I don't have to recreate my state, even when something signals.</p> <p>Here's a tool that gives me over a 100x speedup of one of the slowest and most common things I do as a programmer. I don't know what else you'd need. We can probably make up some reasons, but if this isn't reason enough I don't know what would be. Um, it's also pretty cool? :-)</p> <p>(* Whenever somebody says "never" about something involving technology, that person invariably ends up looking like a complete moron 2 years later, and despite Lisp's longevity, I am sure to be no exception.)</p>
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    1. POEditing programs "while they are running"? Why?
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