Class declaration syntax in Swift - Mini Project: Build & Apply

Class declaration syntax

📖 Scenario: You are creating a simple app to keep track of pets in a pet store. Each pet has a name and an age.

🎯 Goal: Build a Swift class called Pet with properties for name and age.

📋 What You'll Learn

Create a class named Pet

Add a property name of type String

Add a property age of type Int

Create an instance of Pet with name "Buddy" and age 3

Print the pet's name and age

💡 Why This Matters

🌍 Real World

Classes help organize data and behavior for real-world objects like pets, users, or products in apps.

💼 Career

Understanding class syntax is essential for building apps in Swift, especially for iOS development.

1

Create the Pet class with properties

Create a class called Pet with two properties: name of type String and age of type Int. Do not add any methods yet.

Swift

# Your code here

Need a hint?

Use the class keyword to create a class. Declare properties with var and specify their types.

2

Add an initializer to the Pet class

Add an initializer init(name: String, age: Int) to the Pet class that sets the name and age properties.

Swift

class Pet {
    var name: String
    var age: Int

    // Add initializer here
    
}

Need a hint?

Use init to create a constructor. Use self to refer to the current object's properties.

3

Create an instance of Pet

Create a variable called myPet and assign it a new Pet object with name set to "Buddy" and age set to 3.

Swift

class Pet {
    var name: String
    var age: Int

    init(name: String, age: Int) {
        self.name = name
        self.age = age
    }
}

// Create instance myPet here

Need a hint?

Use the class name Pet followed by parentheses with arguments to create an object.

4

Print the pet's name and age

Print the name and age of myPet using print. Format the output exactly as: Buddy is 3 years old.

Swift

class Pet {
    var name: String
    var age: Int

    init(name: String, age: Int) {
        self.name = name
        self.age = age
    }
}

var myPet = Pet(name: "Buddy", age: 3)

// Print pet details here

Need a hint?

Use string interpolation with \(variable) inside the print statement.