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Speaker Notes for hashmap.md (#295)

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* Update hashmap.md

* Update hashmap.md

* Update hashmap.md

* Update src/std/hashmap.md

Co-authored-by: gendx <gendx@users.noreply.github.com>

* Update hashmap.md

* Wording

---------

Co-authored-by: gendx <gendx@users.noreply.github.com>
Co-authored-by: Andrew Walbran <qwandor@google.com>
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Charisee Chiw 2023-02-13 12:42:35 -08:00 committed by GitHub
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@ -35,6 +35,17 @@ fn main() {
<details>
* `HashMap` is not defined in the prelude and needs to be brought into scope.
* Try the following lines of code. The first line will see if a book is in the hashmap and if not return an alternative value. The second line will insert the alternative value in the hashmap if the book is not found.
```rust,ignore
let pc1 = page_counts
.get("Harry Potter and the Sorcerer's Stone ")
.unwrap_or(&336);
let pc2 = page_counts
.entry("The Hunger Games".to_string())
.or_insert(374);
```
* Unlike `vec!`, there is unfortunately no standard `hashmap!` macro.
</details>