Install Groovy on Windows

1. Go here http://groovy-lang.org/download.html

2. Click Windows Installer and click next a bunch of times until it is installed.

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Install Groovy on Ubuntu 20.04

Install Open JDK

Install OpenJDK 14 version sudo apt install openjdk-14-jdk* sudo apt install openjdk-14-jre*

edit your .bashrc file vi ~/.bashrc add the following 2 lines to the end of the file

export JAVA_HOME=/usr/lib/jvm/java-14-openjdk-amd64/
export PATH=$JAVA_HOME/bin:$PATH

Source .bashrc so changes take effect source ~/.bashrc

Install Groovy 3.x

sudo snap install groovy --classic

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Install Groovy on Mac

1. Update Java to at least Java 7 in the System Preferences Java Control Panel

2. Type in Terminal /usr/libexec/java_home -V to get something like 1.7.0_55, x86_64: "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_55.jdk/Contents/Home

3. Type in terminal export JAVA_HOME=/usr/libexec/java_home -v 1.7.0_55, x86_64

4. Type in terminal java -version and make sure you have at least Java 7

5. Install HomeBrew at http://brew.sh/

6. Type in terminal brew install groovy

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Update Atom for Groovy

In Atom Open Command Palette -> Install Packages Themes -> Type language-groovy and install

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Run Groovy code

Groovy files have the extension .groovy. You can run a groovy file at the terminal with: groovy myfile.groovy

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Using this tutorial

This tutorial is a reformatting of the groovy tutorial from Derek Banas. If you have at least one programming language under your belt, you should be able to look at the code examples in each chapter to figure out the basics.

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Nextflow

If you're going through this tutorial to familiarize yourself groovy before learning nextflow, you will be fine going through chapters 1 to 12.