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# removeFirst()

Removes and returns the first element of the collection.

```
@discardableResult mutating func removeFirst() -> Self.Element
```

## Return Value

The removed element.

## Discussion

The collection must not be empty.

```
var bugs = ["Aphid", "Bumblebee", "Cicada", "Damselfly", "Earwig"]
bugs.removeFirst()
print(bugs)
// Prints "["Bumblebee", "Cicada", "Damselfly", "Earwig"]"
```

Calling this method may invalidate any existing indices for use with this
collection.

> Complexity: O(*n*), where *n* is the length of the collection.

---

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