![]() This will start the REPL interpreter and show some details about Scala install version on your system. You just need to type Scala as stated below in your command prompt. You can set up the runtime environment for Scala easily using the steps stated in this article.Īfter installing the environment starting the REPL is quite easy. Use can even change the settings of the compiler in REPL using the :settings command.To inspect class artifacts, the :javap command is used.To disable code wrapping or to define the code as a package, we can use the :paste -raw command.The :paste command is with a class or object to make it companion.The command to enter power mode and import compiler components is :power.The command used for loading a file to get input on REPL is :load.You can get the list of commands you can type REPL by :help command.pressing the tab will return all available methods for that object. You can use the tab for completion of code i.e.The last exception of REPL is bound to $lastException.The interpreter can access the results from the previous compilation if the current line of code requires it. Then the process of read comes again and this cycle goes on until the given program ends. This means REPL first reads the statement from the command line then evaluates it to find the result which will then be printed on the output screen. Working of REPL interpreterĪs its name depicts its works on read-evaluate-print-repeat principle. It is a command-line interpreter that is used to run Scala programming in your system on terminal or command prompt. REPL in Scala stands for Read-Evaluate-Print-Loop. Submitted by Shivang Yadav, on December 12, 2020 Here, we will learn about its working and some sample codes with its working. It is the interpreter used to compile Scala code. These approaches let you add JAR files and other compiled classes to your REPL environment, either at startup or as the REPL is running.Here, we will learn about REPL in Scala. (This command works on Unix systems, but it may be slightly different on Windows.) $ scala -cp "./Project1/bin./Project2/classes" If the class files you want to include are in several different directories, you can add them all to your classpath: If all the class files are located in a subdirectory named classes, you can include them by starting your REPL session like this: However, if your class files are in a subdirectory, you can add them to the environment when you start the session, just as with JAR files. ".:/Users/Al/Projects/Scala/Tests/DateUtils.jar"Ĭompiled class files in the current directory ( *.class) are automatically loaded into the REPL environment, so if a simple Person.class file is in the current directory when you start the REPL, you can create a new Person instance without requiring a classpath command: If you realize you need a JAR file on your classpath after you’ve started a REPL session, you can add one dynamically with the :cp command:Īdded '/Users/Al/Projects/Scala/Tests/DateUtils.jar'. This example shows how to load and use my DateUtils.jar library: If you know that you want to use code from a JAR file when you start the REPL session, add the -cp or -classpath argument to your scala command when you start the session. You want to add individual classes or one or more JAR files to the REPL classpath so you can use them in a Scala REPL session. This is a short recipe, Recipe 14.3, “How to add Jar files and classes to the Scala REPL Classpath.” Problem This is an excerpt from the Scala Cookbook (partially modified for the internet). show more info on classes/objects in repl.
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