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Mutable References

Mutable References

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We want to be able to modify the fruit using the increase_fruit function. To make this work, we need to introduce a second kind of reference: a mutable reference. While an immutable reference is &, a mutable reference is &mut. It looks like this:

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fn increase_fruit(fruit: &mut Fruit) {
    fruit.apples *= 2;
    fruit.bananas *= 3;
}

Note that we put the mut after the & symbol, not before the fruit parameter name. We’ll give a little more explanation on this in the next ...

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