Markdown is a lightweight markup language used to add formatting elements to plaintext text documents. I'm using Markdown for this README.md file, which is a common practice in software projects. Markdown files are easy to write and read, and they can be converted to a variety of other formats (like HTML). This makes them ideal for writing documentation, as they can be read in a text editor or rendered in a web browser.
JSON (JavaScript Object Notation) is a popular data interchange format that's easy to read and write for humans and easy to parse and generate for machines. It's based on JavaScript syntax but is used in many programming languages beyond JavaScript. In my project, I might be using JSON to store configuration data, to communicate between a client and a server, or to store complex data structures for my application.
YAML (YAML Ain't Markup Language) is a human-friendly data serialization standard that's commonly used for configuration files, but can be used in many applications where data is being stored or transmitted. Like JSON, it's easy for humans to read and write. It also supports complex data structures. In my project, I might be using YAML for configuration files, especially if those files need to be edited by humans. YAML's ability to express complex data structures and its more human-friendly syntax can make it a better choice than JSON for these types of files.
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touch fam && echo "yo!" > fam && mkdir -p hawaii && mv fam hawaii/