From 4dfc11d74ab02ac5765ae5d08fb750c91f4744b4 Mon Sep 17 00:00:00 2001 From: Hunter Kvalevog Date: Fri, 2 Oct 2026 21:53:51 -0500 Subject: rustlings: move to rust/ --- rust/rustlings/exercises/12_options/README.md | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 rust/rustlings/exercises/12_options/README.md (limited to 'rust/rustlings/exercises/12_options/README.md') diff --git a/rust/rustlings/exercises/12_options/README.md b/rust/rustlings/exercises/12_options/README.md new file mode 100644 index 0000000..624572a --- /dev/null +++ b/rust/rustlings/exercises/12_options/README.md @@ -0,0 +1,21 @@ +# Options + +Type Option represents an optional value: every Option is either Some and contains a value, or None, and does not. +Option types are very common in Rust code, as they have a number of uses: + +- Initial values +- Return values for functions that are not defined over their entire input range (partial functions) +- Return value for otherwise reporting simple errors, where None is returned on error +- Optional struct fields +- Struct fields that can be loaned or "taken" +- Optional function arguments +- Nullable pointers +- Swapping things out of difficult situations + +## Further Information + +- [Option Enum Format](https://doc.rust-lang.org/book/ch10-01-syntax.html#in-enum-definitions) +- [Option Module Documentation](https://doc.rust-lang.org/std/option/) +- [Option Enum Documentation](https://doc.rust-lang.org/std/option/enum.Option.html) +- [if let](https://doc.rust-lang.org/rust-by-example/flow_control/if_let.html) +- [while let](https://doc.rust-lang.org/rust-by-example/flow_control/while_let.html) -- cgit v1.2.3