Solution

# // Copyright 2023 Google LLC
# // SPDX-License-Identifier: Apache-2.0
#
{{#include exercise.rs:solution}}

• Note that in normalize we were able to do *item /= mag to modify each 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.