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Update iterator.md (#244)

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* Update iterator.md

Adding a Speaker Note emphasizing that all most all functional programming toolbox over collections can be found in the `Iterator` documentation.

* Wordsmithing

Co-authored-by: Andrew Walbran <qwandor@google.com>
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Igor Petruk 2023-01-23 13:45:45 +00:00 committed by GitHub
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src/traits/iterator.md
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@ -29,7 +29,11 @@ fn main() {
<details>
`IntoIterator` is the trait that makes for loops work. It is implemented by collection types such as
`Vec<T>` and references to them such as `&Vec<T>` and `&[T]`. Ranges also implement it.
* `IntoIterator` is the trait that makes for loops work. It is implemented by collection types such as
`Vec<T>` and references to them such as `&Vec<T>` and `&[T]`. Ranges also implement it.
* The `Iterator` trait implements many common functional programming operations over collections
(e.g. `map`, `filter`, `reduce`, etc). This is the trait where you can find all the documentation
about them. In Rust these functions should produce the code as efficient as equivalent imperative
implementations.
</details>