Swift Arrays

Arrays are fundamental data structures in Swift programming. They store ordered collections of values of the same type, allowing efficient access and manipulation of data.

Creating Arrays

In Swift, you can create arrays using various syntaxes:

// Empty array of integers
let emptyArray: [Int] = []

// Array with initial values
let fruits = ["Apple", "Banana", "Orange"]

// Array with repeated values
let fiveZeros = Array(repeating: 0, count: 5)

Accessing and Modifying Arrays

Swift provides several methods to interact with arrays:

• Access elements using index: fruits[0]
• Add elements: fruits.append("Mango")
• Remove elements: fruits.remove(at: 1)
• Update elements: fruits[2] = "Grape"

Array Operations

Swift arrays support various operations for efficient data manipulation:

let numbers = [1, 2, 3, 4, 5]

// Filtering
let evenNumbers = numbers.filter { $0 % 2 == 0 }

// Mapping
let doubledNumbers = numbers.map { $0 * 2 }

// Reducing
let sum = numbers.reduce(0, +)

Multidimensional Arrays

Swift supports nested arrays, allowing you to create multidimensional data structures:

let matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
]

let element = matrix[1][2] // Accesses 6

Array Slicing

You can extract portions of an array using slicing:

let numbers = [1, 2, 3, 4, 5]
let slice = numbers[1...3] // [2, 3, 4]

Best Practices

• Use let for immutable arrays and var for mutable ones
• Leverage Swift's Type Inference when creating arrays
• Utilize Collection Operations for efficient data processing
• Consider using Sets for unordered, unique collections

Arrays in Swift are versatile and powerful. They integrate seamlessly with other Swift features like Closures and Optionals, making them essential for effective Swift programming.