Functional programming gained popularity several years ago and one of the tools that came in handy while I was learning it was Read-Eval-Print-Loop (aka. REPL). The REPL is an interactive console that allows evaluating language expressions and printing results on the fly. Most of the functional languages have one but since Java didn’t really touch on that ground just yet it doesn’t have one. There are several alternatives but I’ve decided to write one as well. Check out the code at GitHub.