<p>Right now I write expressions in the <code>*scratch*</code> buffer and test them by evaluating with <kbd>C-x</kbd> <kbd>C-e</kbd>. I would really appreciate having an interactive interpreter like SLIME or irb, in which I could test Emacs Lisp expressions.</p>

In the
```
*scratch*
```
buffer, just type C-j to evaluate the expression before point.