How to Insert Another Array in Array at Specific Index in Swift?

Swift – Insert Another Array in Array at Specific Index

To insert another Array in Swift Array at specific index, call insert(contentsOf:at:) method. Pass the other array as value for contentsOf and the index as as value for at.

insert(contentsOf:at:) method inserts the content of other array at the specified index.

The syntax to insert contents of another array to this array at specific index is

arrayName.insert(contentsOf: anotherArray, at:index)

We can only insert a contents of array whose type is same as that of the elements in this array. Also, the index has to be within the index limits of the array.

Examples

In the following program, we will take an array fruits, and insert contents of another array moreFruits in this fruits array at index 2.

main.swift

var fruits = ["apple", "banana", "cherry"]
var moreFruits = ["mango", "guava"]
var index = 2

fruits.insert(contentsOf:moreFruits, at:index)
print(fruits)

Output

The contents of of moreFruits has been inserted in fruits array at specified index 2.

The index at which we would like insert should be within the index range of the array. Otherwise, we would get runtime error.

Let us try to insert an array at index 8, when the array length is only 3. We get runtime error as shown in the following example.

main.swift

var fruits = ["apple", "banana", "cherry"]
var moreFruits = ["mango", "guava"]
var index = 8

fruits.insert(contentsOf:moreFruits, at:index)
print(fruits)

Output

Conclusion

In this Swift Tutorial, we learned how to insert contents of another array in this array, at specified index.