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    <p>No, you do not enter functions on the REPL.</p> <p>You edit your source files, just as usual. The Lisp advantage is that you have the system running in the background at the same time, so you can compile individual functions from your source file and put them into the running system, or even replace them there.</p> <p>If you use Slime, you press <code>C-c C-c</code> in your source file to compile and load the function at point. You can then switch to the REPL to test and explore, but anything you want to persist as source, you put into your source files.</p> <p>Tutorials usually start by typing things on the REPL, because there is not much you need to set up for this, but serious development integrates the running system and source file management.</p> <hr> <p>Just to illustrate, my usual workflow (I am using Common Lisp, but Clojure is similar) is like this:</p> <ul> <li>Start Emacs</li> <li><code>M-x slime</code> to start Slime, the Lisp system, and connect the two via Swank</li> <li><code>,</code> (command) <code>load-system</code> <code>foo</code> to load the current project (compiling only if necessary) into the image</li> <li><code>C-x b</code> switch to a source buffer</li> <li><code>C-c ~</code> make the source directory the current directory and the source package the current package of the REPL</li> </ul> <p>Now, I'm set up with my system running in the background. Working is then:</p> <ul> <li>change or add a function or class definition</li> <li><code>C-c C-c</code> to compile and load it into the image</li> <li>switch to REPL, test</li> <li>debug</li> </ul> <p>There are no significant compilation pauses, because I never compile the whole thing at once, just individual definitions.</p>
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    1. COThere's also `C-c C-z` for switching to the REPL buffer from any Lisp source buffer. In general, it's a top priority to learn to take advantage of SLIME and Paredit properly -- and then there's any number of somewhat less important, but still *extremely* useful things, e.g. ido-mode (or something to achieve a similar purpose -- possibly icicles or anything.el). (Thanks for the edit, BTW!)
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    2. COI set up the slime selector at `C-c s`, which gives some more buffer-switching options.
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