---
title: "insert(contentsOf:at:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/string/insert(contentsof:at:)-rdu9"
---

# insert(contentsOf:at:)

Inserts the elements of a sequence into the collection at the specified position.

## Declaration

```swift
mutating func insert<C>(contentsOf newElements: C, at i: Self.Index) where C : Collection, Self.Element == C.Element
```

## Parameters

- `newElements`: The new elements to insert into the collection.
- `i`: The position at which to insert the new elements. index must be a valid index of the collection.

## Discussion

Discussion The new elements are inserted before the element currently at the specified index. If you pass the collection’s endIndex property as the index parameter, the new elements are appended to the collection. Here’s an example of inserting a range of integers into an array of the same type: var numbers = [1, 2, 3, 4, 5] numbers.insert(contentsOf: 100...103, at: 3) print(numbers) // Prints "[1, 2, 3, 100, 101, 102, 103, 4, 5]" Calling this method may invalidate any existing indices for use with this collection. note: O(n + m), where n is length of this collection and m is the length of newElements. If i == endIndex, this method is equivalent to append(contentsOf:).

## See Also

### Inserting Characters

- [insert(_:at:)](swift/string/insert(_:at:).md)
- [insert(_:at:)](swift/string/insert(_:at:)-88yqh.md)
- [insert(contentsOf:at:)](swift/string/insert(contentsof:at:).md)