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# hash(into:)

Hashes the essential components of this value by feeding them into the
given hasher.

```
func hash(into hasher: inout Hasher)
```

## Parameters

`hasher`

The hasher to use when combining the components
of this instance.

## Discussion

Implement this method to conform to the `Hashable` protocol. The
components used for hashing must be the same as the components compared
in your type’s `==` operator implementation. Call `hasher.combine(_:)`
with each of these components.

> Important: In your implementation of `hash(into:)`,
> don’t call `finalize()` on the `hasher` instance provided,
> or replace it with a different instance.
> Doing so may become a compile-time error in the future.

---

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