Hello World in Julia

Hello World in Julie Featured Image

As always, welcome back to another edition of Hello World in Every Language. Today, we’re looking to play around with Hello World in Julia, a numerical analysis language which first appeared in 2012.

Table of Contents

Julia Background

Despite being a relatively new language, Julia has a Wikipedia page. As a result, I won’t have to dig too much to learn about the language.

At any rate, Julia is a computational science language which fills a niche similar to Python and R. In fact, like Python, Julia can be used for general-purpose programming.

One of Julia’s interesting features is multiple dispatch, something that is lacking in Python. Roughly speaking, multiple dispatch allows a user to define multiple functions with the same name but different combinations of arguments.

In addition, Julia is capable of calling C and Python functions directly. Personally, I think that’s a fun little feature considering Julia is compiled at runtime. So, it gets C-like performance as well—perfect for numerical analysis.

Finally, Julia has metaprogramming features, so the language can be modified as needed by the user. If Julia ever takes off, we can probably expect several different dialects of it to emerge.

Hello World in Julia

With the background out of the way, let’s get right into our implementation of Hello World in Julia:

println("Hello, World!")

And unsurprisingly, that’s it! We can implement Hello World in Julia in a single line.

Despite how easy the print functionality seems in Julia, there’s actually a lot going on. First of all, println makes a call to print with an added newline character.

The print function handles any sort of IO, so we could theoretically pass our string to any IO stream. In this case, we leave the default standard output.

Regardless, print makes a call to a function named show. At that point, I’m not sure what happens, but I suspect there’s some C-level call to printf. If you know, let me know in the comments.

How to Run the Solution

With our solution ready, we probably want to run it. Perhaps the easiest thing to do would be to take advantage of Julia’s online editor. Unfortunately, it appears sign up is required to use it, but it’s great for running some code snippets.

Alternatively, we can download the latest version of Julia. While we’re at it, we should probably get a copy of the Hello World in Julia solution. With everything read to go, navigate the command line to the folder containing the solution. Then, run the following:

julia hello-world.jl

That should execute the script. Don’t be afraid to leverage the Julia documentation if you get stuck.

Sample Programs in Every Language

Well, thanks again for sticking around. I’m having a lot of fun with these new languages, so I’ll probably keep the trend going for a few days.

If you liked this article, don’t forget to share it. Also, feel free to recommend future languages in the comments. See you next time!

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Jeremy Grifski

Jeremy grew up in a small town where he enjoyed playing soccer and video games, practicing taekwondo, and trading Pokémon cards. Once out of the nest, he pursued a Bachelors in Computer Engineering with a minor in Game Design. After college, he spent about two years writing software for a major engineering company. Today, he pursues a PhD in Engineering Education in order to ultimately land a teaching gig. In his spare time, Jeremy enjoys spending time with his wife, playing Overwatch and Phantasy Star Online 2, practicing trombone, watching Penguins hockey, and traveling the world.

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