Where X = Programming language that you want to learn and Y = Programming language that you already know.
Learn X if you know Y is a different way to learn the syntax of a new programming language if you already know another. Just select the language that you wish to learn and the language that you already know. You can now learn with comparative examples about coding different things in each language.
Just go to Learn X if you know Y, choose the desired languages, and start to learn. It's a piece of cake.
This site needs help to grow. If you know any programming languages (it doesn't matter if we already have them listed on the site), and want to help us, please go to contributing.md and read the instructions for making contributions.
Project repository is under the MIT license. Site content is shared under a CC BY-NC-SA 3.0 license.