Mobile Development

Swift Basics

Essential Swift syntax: variables, constants, data types.

Variables & Constants

# Variable
var age = 25
var name = "John"
age = 26 # can change

# Constant
let pi = 3.14
let app = "MyApp"

Data Types

let age: Int = 25
let price: Double = 19.99
let name: String = "John"
let isActive: Bool = true

Arrays

# Create array
var fruits = ["Apple", "Banana"]

# Access
let first = fruits[0]
fruits[1] = "Grape"

# Modify
fruits.append("Mango")
fruits.remove(at: 0)

Functions

# Basic
func greet() {
    print("Hello")
}

# With return
func add(a: Int, b: Int) -> Int {
    return a + b
}