Debugging Scala code

Using a dedicated debugger (rather than a bunch of println statements) is sometimes the best way of figuring out where you went wrong when writing your program. Debugging is easy when using ENSIME. You can start the debugger with C-c C-d d, set a breakpoint on a line that the cursor is on with C-c C-d b, or remove a breakpoint with C-c C-d u. After you set up your breakpoints, you can start debugging with C-c C-d r. After your program stops at a breakpoint, you can use C-c C-d n to step to the next line and C-c C-d i to inspect the value of the symbol under the cursor. You can use C-c C-d t to show the current backtrace. Consult the ENSIME Emacs command reference for a few other important debugger features.