read-eval-print-loop

The interactive environment is VERY helpful for a programmer. However, it seems Go does not provide it. Is my understanding correct? Mostafa No, Go does not provide a REPL. However, as already mentioned, Go Playground (this is the new URL) is very handy. The Go Authors are also thinking about adding a feature-rich editor to it. If you want something local, consider installing hsandbox . Running it simply with hsandbox go will split your terminal screen (with screen ) where you can write code at the top and see its execution output at the bottom on every save. There was a gotry among standard

scala> val hi = "Hello \"e" hi: String = Hello "e scala> val hi = "go" hi: String = go Within same REPL session why its allowing me to declare variable hi with same name ? scala> hi res1: String = go scala> hi="new" <console>:8: error: reassignment to val hi="new" ^ This error i understood we cannot reassign val The interesting design feature of the REPL is that your two definitions are translated to: object A { val greeting = "hi" } object B { val greeting = "bye" } A subsequent usage will import the last definition: object C { import B.greeting val message = s"$greeting, Bob." // your code }

Is there something like python's interactive REPL mode, but for Java? So that I can, for example, type InetAddress.getAllByName( localHostName ) in a window, and immediately get results, without all this public static void nightmare() thing? edit Since Java 9 there's JShell Original answer follows You can also use Groovy Console . It is an interactive console where you can do what you want. Since Groovy also includes classes from the core java platform, you'll be able to use those classes as well. It looks like this: Eclipse has a feature to do this, although it's not a loop. It's called a

I read What's new in Xcode 6 . The article introduces some new feature about Xcode 6, and it says: Command Line Xcode’s debugger includes an interactive version of the Swift language, known as the REPL (Read-Eval-Print-Loop). Use Swift syntax to evaluate and interact with your running app or write new code in a script-like environment. The REPL is available from within LLDB in Xcode’s console, or from Terminal. I want to know how to get the REPL? sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer then you can do one of these: xcrun swift lldb --repl As of Xcode 6.1 - typing

In Python, how do you return a variable like: function(x): return x Without the 'x' ( ' ) being around the x ? In the Python interactive prompt, if you return a string, it will be displayed with quotes around it, mainly so that you know it's a string. If you just print the string, it will not be shown with quotes (unless the string has quotes in it). >>> 1 # just a number, so no quotes 1 >>> "hi" # just a string, displayed with quotes 'hi' >>> print("hi") # being *printed* to the screen, so do not show quotes hi >>> "'hello'" # string with embedded single quotes "'hello'" >>> print("'hello'")