jovannypcg/advent-of-code-2019

Solutions to Advent of Code 2019

Advent of Code 2019

Solutions to problems from Advent of Code 2019.

• Prerequisites
  • SDKMan
  • Installing Java 8 Using SDKMan
  • Installing Clojure
• Usage
  • Start a REPL
  • Playing around
• Testing

Prerequisites

• Java 8
• Clojure 1.10.1
• Leiningen 2.9.3 (optional)

SDKMan

Java 8 can be installed via SDKMan, which is a version manager for technologies related to the Java Virtual Machine (similar to rbenv for Ruby or pyenv for Python).

Installing Java 8 Using SDKMan

$ sdk install java 8.0.242.hs-adpt
$ export JAVA_HOME=~/.sdkman/candidates/java/current

Installing Clojure

Visit the official web site to get the instructions according to your operating system.

Installing Leiningen

Visit the official web site to get the instructions according to your operating system.

Usage

Leiningen

Start a REPL

$ cd /path/to/repo
$ lein repl

Playing around

Once the repl has started, change the namespace for the one you are interested in. For example, to play around with the day-1.spacecraft namespace, run:

advent-of-code=> (in-ns 'day-1.spacecraft)
#object[clojure.lang.Namespace 0x7725cd39 "day-1.spacecraft"]

day-1.spacecraft=> (fuel-required module-masses)
4959709

Testing

$ lein test

Clojure CLI

Start a REPL

$ cd /path/to/repo
$ clj
Clojure 1.10.1
user=>

Playing around

Once the repl has started, load the advent_of_code.clj file, that requires the namespaces of all days. It is like a facade to those namespaces to avoid loading each file. Then change the current namespace for the one you are interested in.

For example, to play around with the day-1.spacecraft namespace, run:

user=> (load-file "src/main/clojure/advent_of_code.clj")
nil

user=> (in-ns 'day-1.spacecraft)
#object[clojure.lang.Namespace 0x7725cd39 "day-1.spacecraft"]

day-1.spacecraft=> (fuel-required module-masses)
4959709

Testing

$ clj -Atest