Swift Programming Language Cheatsheet

Basic cheat sheet for Swift programming language covering various topics:

1. Variables and Constants:

// Variables
var myVariable = 42
myVariable = 50

// Constants
let myConstant = 42

2. Data Types:

let myString: String = "Hello, Swift!"
let myInt: Int = 10
let myDouble: Double = 3.14
let myBool: Bool = true

3. Control Flow:

3.1 If Statements:

let temperature = 25

if temperature < 18 {
    print("It's cold.")
} else if temperature >= 18 && temperature <= 24 {
    print("It's comfortable.")
} else {
    print("It's hot.")
}

3.2 Switch Statements:

let fruit = "apple"

switch fruit {
case "apple":
    print("It's an apple.")
case "banana":
    print("It's a banana.")
default:
    print("Unknown fruit.")
}

4. Loops:

4.1 For Loop:

for index in 1...5 {
    print("Index is \(index)")
}

4.2 While Loop:

var counter = 0

while counter < 5 {
    print("Counter is \(counter)")
    counter += 1
}

5. Functions:

func greet(name: String) -> String {
    return "Hello, \(name)!"
}

let greeting = greet(name: "Swift")
print(greeting)

6. Optionals:

var optionalValue: Int? = 42

if let value = optionalValue {
    print("The value is \(value)")
} else {
    print("No value")
}

7. Arrays:

var myArray = [1, 2, 3, 4, 5]

for number in myArray {
    print("Number is \(number)")
}

8. Dictionaries:

var myDict = ["name": "Swift", "version": 5.5]

print("Name: \(myDict["name"]!)")
print("Version: \(myDict["version"]!)")

9. Classes and Structures:

class Car {
    var brand: String

    init(brand: String) {
        self.brand = brand
    }

    func startEngine() {
        print("Engine started.")
    }
}

let myCar = Car(brand: "Toyota")
myCar.startEngine()

10. Closures:

let myClosure: (Int, Int) -> Int = { (a, b) in
    return a + b
}

let result = myClosure(5, 3)
print("Result: \(result)")

This cheat sheet covers some fundamental aspects of Swift programming. Refer to the official documentation for more in-depth information and examples.

FAQ