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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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| .. | ||
| overlay | ||
| alias.rs | ||
| break_.rs | ||
| commandline.rs | ||
| const_.rs | ||
| continue_.rs | ||
| def_env.rs | ||
| def.rs | ||
| describe.rs | ||
| do_.rs | ||
| echo.rs | ||
| error_make.rs | ||
| export_alias.rs | ||
| export_def_env.rs | ||
| export_def.rs | ||
| export_extern.rs | ||
| export_use.rs | ||
| export.rs | ||
| extern_.rs | ||
| for_.rs | ||
| help_aliases.rs | ||
| help_commands.rs | ||
| help_externs.rs | ||
| help_modules.rs | ||
| help_operators.rs | ||
| help.rs | ||
| hide_env.rs | ||
| hide.rs | ||
| if_.rs | ||
| ignore.rs | ||
| let_.rs | ||
| loop_.rs | ||
| match_.rs | ||
| mod.rs | ||
| module.rs | ||
| mut_.rs | ||
| register.rs | ||
| return_.rs | ||
| try_.rs | ||
| use_.rs | ||
| version.rs | ||
| while_.rs | ||