f$test
In addition to the debug-tab there is a special function named f$test. While f$debug is meant for a set of multiple expressions f$test is for a single large expression, even up to complete multi-line function text. No equality-sign here. Just enter your code and play around until you are satisfied with the results.
Document generated by eLyXer 1.2.5 (2013-03-10) on 2015-01-03T10:07:19.093000