read-eval-print-loop

I have played with a lot of code in a repl console, how can I clear it? I would like a fresh one without restarting it. Can that be done? Peter Tillemans If you want to clear the current namespace of all temporary variables and functions you declared you can use this one liner (or make a function of it) : (map #(ns-unmap *ns* %) (keys (ns-interns *ns*))) or (ns myutil) (defn ns-clean "Remove all internal mappings from a given name space or the current one if no parameter given." ([] (ns-clean *ns*)) ([ns] (map #(ns-unmap ns %) (keys (ns-interns ns))))) (ns mytest) ... make loads of junk ...

I'd like to get a colored REPL for clojure code, similar to what you can do with IRB for Ruby. Are there any libraries or settings for user.clj that provide automatic coloring of the REPL? Example IRB: I do not know of any way to have the basic Clojure REPL, as started by something like java -cp clojure.jar clojure.main , do syntax highlighting. If, however, you use Emacs & SLIME (the development environment of choice of a great part of the Clojure community!), then you can have the SLIME REPL highlight syntax like clojure-mode does. First, you'll have to lift some code from the clojure-mode

I'm looking to find a REPL system that can be executed on a web page and that the server can react to. Is there anything out there (I'd assume it would have to be using Javascript/AJAX)? If there's a PHP implementation, it would be even more awesome, but for now I'm just looking for some kind of an implementation. A JavaScript REPL: http://tech.einaregilsson.com/repl.html A PHP REPL developed at Facebook: http://www.phpsh.org/ A Python REPL: http://www.trypython.org/ A Ruby REPL: http://tryruby.org/ A Haskell REPL: http://tryhaskell.org/ An R REPL: http://rstudio.org/ repl.it Have you tried

I've been working with Scala for a while now and have written a 10,000+ line program with it, but I'm still confused by some of the inner workings. I came to Scala from Python after already having intimate familiarity with Java, C and Lisp, but even so it's been slow going, and a huge problem is the frustrating difficulty I've often found when trying to investigate the inner workings of objects/types/classes/etc. using the Scala REPL as compared with Python. In Python you can investigate any object foo (type, object in a global variable, built-in function, etc.) using foo to see what the thing

So I just got Land of Lisp and started to do the first program. I have a couple questions. Is there a way to just write some code and run it through a compiler, or interpreter, and not use the REPL thing? I don't like it much. I can't seem to go back if I messed up. It just kinda says "Ha you screwed up, retype that whole function." I would also like to know what the point of REPL is. Non-REPL work flow Edit your file Compile the file using compile-file ; fix errors and warnings; repeat. Load the file using load ; evaluate the form you want; repeat Example $ cat > f.lisp <<EOF (defun f (x) (if

Take this example: >>> 5+10 15 >>> a = 5 + 10 >>> a 15 How and why does Python do this without an explicit print statement? If I do the same thing in an IPython cell, only the last such value is actually printed on stdout in this way: In[1]: 5+10 1 Out[1]: 1 Why does this happen? When Python is in "interactive" mode, it enables certain behaviors it doesn't have in non-interactive mode. For example, sys.displayhook , originally specified in PEP 217 . If value is not None, this function prints it to sys.stdout, and saves it in __builtin__._ . sys.displayhook is called on the result of evaluating