Generic Instance Method

insert(contentsOf:at:)

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

Declaration

mutating func insert<C>(contentsOf newElements: C, at i: Int) 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

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.

Complexity: 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:).

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