---
title: joined()
framework: swift
role: symbol
role_heading: Instance Method
path: swift/emptycollection/joined()
---

# joined()

Returns the elements of this sequence of sequences, concatenated.

## Declaration

```swift
func joined() -> FlattenSequence<Self>
```

## Return Value

Return Value A flattened view of the elements of this sequence of sequences.

## Discussion

Discussion In this example, an array of three ranges is flattened so that the elements of each range can be iterated in turn. let ranges = [0..<3, 8..<10, 15..<17]

// A for-in loop over 'ranges' accesses each range: for range in ranges {   print(range) } // Prints "0..<3" // Prints "8..<10" // Prints "15..<17"

// Use 'joined()' to access each element of each range: for index in ranges.joined() {     print(index, terminator: " ") } // Prints: "0 1 2 8 9 15 16"