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Add speaker note regarding passing slices instead #2851

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Add speaker note regarding passing slices instead #2851

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5 changes: 5 additions & 0 deletions src/references/solution.md
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Expand Up @@ -10,4 +10,9 @@
element. This is because we're iterating using a mutable reference to an
array, which causes the `for` loop to give mutable references to each element.

- It is also possible to take slice references here, e.g.,
`fn
magnitude(vector: &[f64]) -> f64`. This makes the function more general,
at the cost of a runtime length check.

</details>
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