Use Arrays in Swift

Written by Team Kodeco

Arrays are a fundamental data structure that allows you to store a collection of items of the same type in a single variable. They are ordered, meaning that each item in the array has a specific index, starting at 0, that can be used to access its value.

Here’s an example of how to declare and use an array in Swift:

// Declare an array of integers
var numbers = [1, 2, 3]

// Alternative way with manual type annotation
var altNumbers: [Int] = [1, 2, 3]

// Print the first item in the array
print(numbers[0]) // Output: 1

// Add an item to the array
numbers.append(4)

// Remove an item from the array
numbers.remove(at: 2)

// Iterate over the array
for number in numbers {
  print(number)
}
// Output: 1
//         2
//         4

It’s important to note that the type of the array must be specified when it’s declared, for example var numbers: [Int] or inferred from the initializer, for example var numbers = [1, 2, 3].

Create an Empty Array

You can create an empty array of a specific type by either using the Array type, or by using type annotation:

var numbers = Array<Int>() // Method 1
var altNumbers: [Int] = [] // Method 2

Get the Length of an Array

You can use the count property to get the count of elements in an array:

var numbers = [1, 2, 3]
numbers.count // 3

Check if an Array is Empty

You can use the isEmpty property to check if the array is empty or not:

var numbers = [1, 2, 3]
numbers.isEmpty // false