---
title: "flatMap(_:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/array/flatmap(_:)-6chu8"
---

# flatMap(_:)

## Declaration

```swift
func flatMap<ElementOfResult>(_ transform: (Self.Element) throws -> ElementOfResult?) rethrows -> [ElementOfResult]
```

## See Also

### Transforming an Array

- [flatMap(_:)](swift/array/flatmap(_:)-i3mr.md)
- [compactMap(_:)](swift/array/compactmap(_:).md)
- [reduce(_:_:)](swift/array/reduce(_:_:).md)
- [reduce(into:_:)](swift/array/reduce(into:_:).md)
- [lazy](swift/array/lazy.md)