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To update or switch versions, run webi julia@stable (or @v1.10, @beta, etc).

Cheat Sheet

Julia is a programming language for Data Science - a far better alternative to (or plugin for) Python when performance matters.

Table of Contents

• Files
• Hello World
• Compile for Distribution
• Vim Plugin

Files

These are the files / directories that are created and/or modified with this install:

~/.config/envman/PATH.env
~/.local/opt/julia/

How to create a Hello World with Julia

Try out the REPL by coping and pasting the code below (it'll print some nice ASCII art to the console):

julia -i

function mandelbrot(a)
    z = 0
    for i=1:50
        z = z^2 + a
    end
    return z
end

for y=1.0:-0.05:-1.0
    for x=-2.0:0.0315:0.5
        abs(mandelbrot(complex(x, y))) < 2 ? print("*") : print(" ")
    end
    println()
end

Or write the program to ./mandelbrot.jl and run it:

julia ./mandelbrot.jl

How to Build a Distributable Binary with Julia

Here's an example project that you can build:

1. Clone and enter the example project

   git clone --depth=1 https://github.com/JuliaLang/PackageCompiler.jl ./PackageCompiler
   pushd ./PackageCompiler/examples
   

2. Run Julia in project mode

   julia -q --project
   

3. Compile the binary

   using PackageCompiler
   create_app("MyApp", "MyAppCompiled")
   exit()
   

4. Test & Enjoy

   ./MyAppCompiled/bin/MyApp foo bar --julia-args -t4
   

See also:

• https://docs.juliahub.com/PackageCompiler/MMV8C/2.1.16/apps.html
• https://github.com/JuliaLang/PackageCompiler.jl/tree/master/examples/MyApp

How to Install the Language Server (for VSCode, Vim, etc)

Open the Julia REPL and add LanguageServer:

julia -i

using Pkg
Pkg.add("LanguageServer")
Pkg.add("SymbolServer")

You'll need to reinstall if you switch environments.

How to Install the Julia Vim Plugin

julia-vim adds support for:

• Latex-to-Unicode
• jumping from between start and end of blocks with %
  (and other block jump sequences)

mkdir -p ~/.vim/pack/plugins/start
git clone https://github.com/JuliaEditorSupport/julia-vim.git \
    ~/.vim/pack/plugins/start/julia-vim

Usage Examples:

• \alpha<tab> will produce α
  (meaning typing \alpha and hitting the tab key)
• Hitting % on an end will take you to the function or for, etc