durbon / AdventOfCode

Materias for a deliberate practice session at JT

Level your Scala up

This repo has a template project for the deliberate practice session of Scala using the [advent of code]. We will have a private leaderboard, ask for the joining code during the session.

The objective of this activity is to improve at writing Scala code by writing non-production code at shouting distance of more experienced developers. We will circulating the room and suggesting improvements and things to try but don't hesitate to ask!

Requirements

• You should be able to write some Scala code to begin with. This is not a feel-good, nod-your-head session. Take a look at the introduction video of @apoloval or read an introductory tutorial.
• You will need a recent JVM (7 or 8) and SBT.
• While a proper IDE is not mandatory, at least an editor with syntax highlighting is recommended. My recommendation of IDE is the IntelliJ community edition with the Scala plugin (Settings, Plugins, Browse repositories, and then select the Scala one).

How to use this repo

First, either clone it with git clone [e-mail]:sortega/AdventOfCode.git or download a zipped version.

Advent Of Code is organized in days, having two related problems to solve per day. You will find skeleton files for the first ones in src/main/scala/advent, named DayX.scala. You are supposed to write the implementations for the methods part1 and part2 (feel free of adding auxiliar functions and classes).

package advent

object Day1 {

  def part1(input: String): Int = ???

  def part2(input: String): Int = ???

  def main(args: Array[String]): Unit = {
    val basicInput = ""
    val difficultInput = ""
    println("Part 1 result: " + part1(basicInput))
    println("Part 2 result: " + part2(difficultInput))
  }
}

There are some sample tests in src/test/scala/advent that you might want to use and extends with additional test cases. The easiest way to execute then is opening a SBT session from the project root:

% sbt
[info] Loading project definition from /Users/sortega/Repositories/github/AdventOfCode/project
[info] Set current project to advent-of-code (in build file:/Users/sortega/Repositories/github/AdventOfCode/)
> test
[info] Compiling 1 Scala source to /Users/sortega/Repositories/github/AdventOfCode/target/scala-2.11/classes...
[info] Compiling 1 Scala source to /Users/sortega/Repositories/github/AdventOfCode/target/scala-2.11/test-classes...
[info] Day1Test:
...
[error] Failed: Total 52, Failed 49, Errors 0, Passed 3
...
> testOnly advent.Day1Test
[info] Day1Test:
...
[info] Total number of tests run: 5
[info] Suites: completed 1, aborted 0
[info] Tests: succeeded 0, failed 5, canceled 0, ignored 0, pending 0
[info] *** 5 TESTS FAILED ***

Use test for running all the tests and testOnly advent.DayXXXTest for focusing on one of them. You can turn the test to auto run by prepending a tilde (~test instead of test).

The code skeletons have a main function for producing the final result that Advent Of Code site asks for. If you copy the problem input to the corresponding variable (the input is different for each participant) you can get the results this way:

% sbt
[info] Loading project definition from /Users/sortega/Repositories/github/AdventOfCode/project
[info] Set current project to advent-of-code (in build file:/Users/sortega/Repositories/github/AdventOfCode/)
> runMain advent.DayXX
Part 1 result: XXXX
Part 2 result: XXXX