A new installment to https://opensourcetechtrn.blogspot.com/ this video covers creating a basic conversion application in Python, Java, and Javascript. The code is fairly straightforward and I'll try to provide more details including the source code in the blog.
Again this isn't trying to be the greatest program in the world. Rather just to give newer users a taste of what these programming languages look like and how to get over the hump of learning a new programming language.