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* Rust isn't functional, but it does have functional elements * End sentence Co-authored-by: Martin Geisler <martin@geisler.net> * add info about OO --------- Co-authored-by: Martin Geisler <martin@geisler.net>
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Hello World!
Let us jump into the simplest possible Rust program, a classic Hello World program:
fn main() {
println!("Hello 🌍!");
}
What you see:
- Functions are introduced with
fn. - Blocks are delimited by curly braces like in C and C++.
- The
mainfunction is the entry point of the program. - Rust has hygienic macros,
println!is an example of this. - Rust strings are UTF-8 encoded and can contain any Unicode character.
This slide tries to make the students comfortable with Rust code. They will see a ton of it over the next four days so we start small with something familiar.
Key points:
-
Rust is very much like other languages in the C/C++/Java tradition. It is imperative and it doesn't try to reinvent things unless absolutely necessary.
-
Rust is modern with full support for things like Unicode.
-
Rust uses macros for situations where you want to have a variable number of arguments (no function overloading).
-
Macros being 'hygienic' means they don't accidentally capture identifiers from the scope they are used in. Rust macros are actually only partially hygienic.
-
Rust is multi-paradigm. For example, it has powerful object-oriented programming features, and, while it is not a functional language, it includes a range of functional concepts.