Refer to the lab handout lab1.pdf for details about the assignment. This file provides some information to help you get started with setting up your development environment for the labs.
The current version of Scala is 2.10.3 at the start of Spring 2014. We standardize to this version.
We will support Scala IDE for Eclipse for Scala development in this course. You are welcome to use any development environment, but we may not be able answer questions in your particular environment.
To install Scala IDE, first download and install Eclipse. The standard package is sufficient. For Spring 2014, we suggest installing Eclipse Kepler (the latest version). Then, follow the directions for installing Scala IDE.
To import the Lab 1 project files into Eclipse, go to
File > Import > Existing Projects into Workspace (under General)
and then select
Select archive file:
and browse to the lab1.zip that you downloaded from the course website.
While not required if you have installed Scala IDE, you may also want to install the command-line Scala compiler and tools. If you would like to build the project on the command-line, you should install sbt. Scala and sbt is available in many OS-specific package managers.
For your convenience, an sbt script (build.sbt) is included. You can issue the following commands to compile, run and test your code:
$ sbt run
runs your project (after compiling).
$ sbt clean
deletes the previous compilation.
It is often convenient to run sbt interactively
and then run via
at the sbt prompt.
From the command-line, you can start the scala interpreter using the command
and can import the functions in your lab in the following way
scala> import Lab1._
Note that you will need to run the scala interpreter in the same directory as the compiled version (lab1/bin/).
In Scala IDE, you can start a Scala interpreter with the project files available by selecting
Window > Show View > Scala Interpreter
We will be using the ScalaTest framework for unit testing. Using this framework, we practice test-driven development (TDD), a standard practice in industry.
We suggest you install the ScalaTest plugin for Scala IDE.
You do not need to explicitly download ScalaTest.
We provide some unit tests in Lab1Spec.scala to drive your implementation. To run tests, right-click on the file and select
Run As > ScalaTest - File
You can also run tests via
$ sbt test
Run As > Run Configuration ...
For quick experimentation, it is more convenient to use the Scala Interpreter window.
A part of your lab grade is determined by passing a set of grading tests. To run the autograder, do
$ sbt "project lab1-grader" run
For Lab 1, the grading tests are those in Lab1Spec.scala. In future labs, these test sets may diverge.