Swift Tutorials: Properties (Stored, Computed) 🚀

Welcome to our Swift Properties tutorial! Today, we'll delve into one of the fundamental building blocks of Swift classes and structures - Properties. 📝

Properties define characteristics of your custom types (classes and structures). In this lesson, we'll explore two types of properties: Stored and Computed.

Stored Properties 🎯

Stored properties are the most basic type of properties. They store values that are defined when an instance of the class or structure is created.

swift

struct Person {
    var name: String
    var age: Int
}

let john = Person(name: "John", age: 25)

In the above example, name and age are stored properties of Person structure. 💡 Pro Tip: Use var to create mutable properties and let for constants.

Quiz

Question: What is the data type of name and age in the above example?

A: String and Int B: Number and Age C: Variable and Constants Correct: A Explanation: The data type of name is String and age is Int.

Computed Properties 🚀

Unlike stored properties, Computed properties do not store actual values. Instead, they provide a way to compute and return values on demand.

swift

struct Point {
    var x: Double, y: Double

    var magnitude: Double {
        return sqrt(x*x + y*y)
    }
}

let p1 = Point(x: 3.0, y: 4.0)
print(p1.magnitude)  // Output: 5.0

In the above example, magnitude is a computed property that calculates the length of a vector using Pythagorean theorem.

Stay tuned for more Swift tutorials, where we'll dive deeper into the world of Swift programming!

📝 Note: Don't forget to check out our upcoming lessons on methods, enums, and more! Happy coding! 🤖