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* Indent code in speaker notes #475 * Update stack.md * Update destructuring-arrays.md * Update hashmap.md * Update traits.md
38 lines
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Markdown
38 lines
1.0 KiB
Markdown
# Destructuring Arrays
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You can destructure arrays, tuples, and slices by matching on their elements:
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```rust,editable
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{{#include ../../third_party/rust-by-example/destructuring-arrays.rs}}
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```
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<details>
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* Destructuring of slices of unknown length also works with patterns of fixed length.
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```rust,editable
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fn main() {
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inspect(&[0, -2, 3]);
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inspect(&[0, -2, 3, 4]);
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}
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#[rustfmt::skip]
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fn inspect(slice: &[i32]) {
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println!("Tell me about {slice:?}");
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match slice {
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&[0, y, z] => println!("First is 0, y = {y}, and z = {z}"),
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&[1, ..] => println!("First is 1 and the rest were ignored"),
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_ => println!("All elements were ignored"),
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}
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}
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```
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* Create a new pattern using `_` to represent an element.
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* Add more values to the array.
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* Point out that how `..` will expand to account for different number of elements.
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* Show matching against the tail with patterns `[.., b]` and `[a@..,b]`
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</details>
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