read-eval-print-loop

I'm completely new to CL, and I'd like to learn how to read documentation strings and get other help information from the REPL. Something like help(symbol) in Python, or symbol? in iPython, or :t and :i in Haskell's GHCi. So, given a symbol name, I'd like to be able to know: what kind of value it is bound to, if any (a function, a variable, none at all) if it is a function or a macro, then what are its positional arguments if it has a docstring, show it what package or file it is coming from or when it was defined I found there is (documentation '_symbol_ '_type_) , but it is not exactly what

Is there a way configure node.js's repl? I want to require jquery and underscore automatically whenever the repl starts. Is there a file (noderc?) that node.js loads when it starts the repl? The equivalent in Python is to edit ~/.ipython/ipy_user_conf.py with: import_mod('sys os datetime re itertools functools') I don't know of any such configuration file, but if you want to have modules foo and bar be available in a REPL, you can create a file myrepl.js containing: var myrepl = require("repl").start(); ["foo", "bar"].forEach(function(modName){ myrepl.context[modName] = require(modName); });

I am writing a module that relies on optimization. I want to test this module in ghci. But starting ghc in --interactive mode automatically disables optimization; if I compile the module with -O and then try to load it in an interactive session, ghc insists on loading it in interpreted mode. For a simple test case to distinguish optimized and unoptimized modules, isOptimized below evaluates to True with optimization on, but False with optimization off: isOptimized :: Bool isOptimized = g g :: Bool g = False {-# NOINLINE g #-} {-# RULES "g/True" g = True #-} Either use ghci -fobject-code -O

Hi i am starting with haskell and trying to set up my emacs for its development. I have haskell-mod and ghc-mod latest in emacs 24.3.1 . GHC is 7.6.3 i have created a haskell file first.hs and when i do C-c C-l It asks : start a new project named haskell ? y or n my directory name is haskell. I press y Set the cabal directory I have tried with both ~/.cabal and my current directory named haskell Set the current directory Just pressed enter as it has haskell directory It shows error messages : haskell-process-start: cl-ecase failed: cabal-rep, (ghci quote cabal-repl quote cabal-ghci quote cabal

There are languages other than Lisp (ruby, scala) that say they use REPL (Read, Eval, Print, Loop), but it is unclear whether what is meant by REPL is the same as in Lisp. How is Lisp REPL different from non-Lisp REPL? The idea of a REPL comes from the Lisp community. There are other forms of textual interactive interfaces, for example the command line interface . Some textual interfaces also allow a subset of some kind of programming language to be executed. REPL stands for READ EVAL PRINT LOOP: (loop (print (eval (read)))). Each of the four above functions are primitive Lisp functions. In

I wonder if there is something like a standalone Version of Visual Studios "Immediate Window"? Sometimes I just want to test some simple stuff, like "DateTime.Parse("blah")" to see if that works. But everytime i have to create a new console application, put in my code and test it. The Immediate Window sadly only works when I am debugging something. Could PowerShell do that? Just open a CLI similar to what cmd.exe does, allowing me to execute some C# code? Linqpad - I use it like this all the time. http://www.linqpad.net/ Don't be misled by the name - that just describes the original motivation

First of all for the built in docs, and also for my own code. Specifically, I want to get information similar to how in python you can call help() on a method or object to get information on just that object printed into the repl. Scaladocs are generated as HTML, so you don't want them appearing in the REPL window. You might want to load docs in a browser from the REPL, however. You can do that by creating your own method like so (this one takes an instance; you could have it take an instance of Class[A] instead, if you prefer): def viewdoc[A](a: A) { val name = a.asInstanceOf[AnyRef].getClass