---
title: "+(_:_:)"
framework: swift
role: symbol
role_heading: Operator
path: "swift/string/unicodescalarview/+(_:_:)-61ucr"
---

# +(_:_:)

Creates a new collection by concatenating the elements of a sequence and a collection.

## Declaration

```swift
static func + <Other>(lhs: Other, rhs: Self) -> Self where Other : Sequence, Self.Element == Other.Element
```

## Parameters

- `lhs`: A collection or finite sequence.
- `rhs`: A range-replaceable collection.

## Discussion

Discussion The two arguments must have the same Element type. For example, you can concatenate the elements of a Range<Int> instance and an integer array. let numbers = [7, 8, 9, 10] let moreNumbers = (1...6) + numbers print(moreNumbers) // Prints "[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]" The resulting collection has the type of argument on the right-hand side. In the example above, moreNumbers has the same type as numbers, which is [Int].