We’re saying “call this macro, called println with these parameters.” This is just like how the main function has a parameter list, except the println macro has a parameter. This is the parameter list for the macro call. The difference is that it ends with an exclamation point ( !). It means “print and add a new line.” For now, you can think of println as a function. This is a macro, which is very similar to functions. The body will say what the main function does. They define the beginning and end of our code body. These are called curly braces or brackets. We’ll see plenty of functions later that do have parameters. It’s empty right now, meaning there are no parameters. These parentheses are the parameter list for this function. The main function is where your program starts. The fn is short for “function.” In Rust (and most other programming languages), a function means “tell me some information, I’ll do some things, and then give you an answer.” Let’s break down the pieces of this code. Becoming a Rust developer at this early stage will help you land these in-demand roles that offer unparalleled job security and high pay. Rust continues to improve and the demands of low-level systems continue to rise, so Rust is in an opportune position to become the language of tomorrow’s operating systems. While it is not yet common amongst big companies, it remains one of the highest-rated languages. The Rust programming language is ideal for low-level system programming because of its unique ownership memory allocation system and its dedication to optimized and safe concurrency. Rust sets itself apart from other low-level languages with great concurrent programming support featuring data-race prevention. Some of the most common applications of Rust are low-level systems like operating kernels or microcontroller applications. Rust is an ideal systems programming language for embedded and bare-metal development. The language is most similar to C or C++ but uses a borrow checker to validate the safety of references. Rust is optimized for performance and safety, especially prioritizing safe concurrency. It was developed by Graydon Hoare at Mozilla Research in 2010. Rust is a multi-paradigm, statically-typed open-source programming language used to build operating systems, compilers, and other hardware to software tools.
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