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# Description This adds `match` and basic pattern matching. An example: ``` match $x { 1..10 => { print "Value is between 1 and 10" } { foo: $bar } => { print $"Value has a 'foo' field with value ($bar)" } [$a, $b] => { print $"Value is a list with two items: ($a) and ($b)" } _ => { print "Value is none of the above" } } ``` Like the recent changes to `if` to allow it to be used as an expression, `match` can also be used as an expression. This allows you to assign the result to a variable, eg) `let xyz = match ...` I've also included a short-hand pattern for matching records, as I think it might help when doing a lot of record patterns: `{$foo}` which is equivalent to `{foo: $foo}`. There are still missing components, so consider this the first step in full pattern matching support. Currently missing: * Patterns for strings * Or-patterns (like the `|` in Rust) * Patterns for tables (unclear how we want to match a table, so it'll need some design) * Patterns for binary values * And much more # User-Facing Changes [see above] # Tests + Formatting Don't forget to add tests that cover your changes. Make sure you've run and fixed any issues with these commands: - `cargo fmt --all -- --check` to check standard code formatting (`cargo fmt --all` applies these changes) - `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A clippy::needless_collect` to check that you're using the standard code style - `cargo test --workspace` to check that all tests pass > **Note** > from `nushell` you can also use the `toolkit` as follows > ```bash > use toolkit.nu # or use an `env_change` hook to activate it automatically > toolkit check pr > ``` # After Submitting If your PR had any user-facing changes, update [the documentation](https://github.com/nushell/nushell.github.io) after the PR is merged, if necessary. This will help us keep the docs up to date. |
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nu-protocol
The nu-protocol crate holds the definitions of structs/traits that are used throughout Nushell. This gives us one way to expose them to many other crates, as well as make these definitions available to each other, without causing mutually recursive dependencies.