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Speaker notes for while-let-expressions.md (#294)

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* Speaker notes for while-let-expressions.md

#274

* Update while-let-expressions.md

---------

Co-authored-by: Andrew Walbran <qwandor@google.com>
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Charisee Chiw 2023-01-30 03:47:56 -08:00 committed by GitHub
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src/control-flow/while-let-expressions.md
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@ -20,3 +20,11 @@ return `None`. The `while let` lets us keep iterating through all items.
See [pattern matching](../pattern-matching.md) for more details on patterns in
Rust.
<details>
* Point out that the `while let` loop will keep going as long as the value matches the pattern.
* You could rewrite the `while let` loop as an infinite loop with an if statement that breaks when there is no value to unwrap for `iter.next()`. The `while let` provides syntactic sugar for the above scenario.
</details>