Run function behavior and use cases in Kotlin - Mini Project: Build & Apply

Run function behavior and use cases

📖 Scenario: You are working on a Kotlin program that processes user information. You want to use the run function to execute a block of code with an object and get a result from it.

🎯 Goal: Learn how to use the Kotlin run function to execute code blocks and return results in a clean and readable way.

📋 What You'll Learn

Create a data class called User with properties name and age

Create an instance of User with specific values

Use the run function on the User instance to create a greeting message

Print the greeting message

💡 Why This Matters

🌍 Real World

The <code>run</code> function helps write clean and readable code when you want to perform operations on an object and get a result without creating extra variables.

💼 Career

Understanding Kotlin scope functions like <code>run</code> is important for writing concise and maintainable Android apps and backend services.

1

Create the User data class

Create a Kotlin data class called User with two properties: name of type String and age of type Int.

Kotlin

# Your code here

Need a hint?

Use the data class keyword followed by the class name and properties inside parentheses.

2

Create a User instance

Create a variable called user and assign it a User object with name set to "Alice" and age set to 30.

Kotlin

data class User(val name: String, val age: Int)
# Your code here

Need a hint?

Use the User constructor with named arguments to create the instance.

3

Use run function to create a greeting

Use the run function on the user variable to create a variable called greeting that contains the string "Hello, Alice! You are 30 years old.". Use this.name and this.age inside the run block.

Kotlin

data class User(val name: String, val age: Int)

val user = User(name = "Alice", age = 30)

# Your code here

Need a hint?

Use user.run { ... } and return the greeting string inside the block.

4

Print the greeting message

Print the greeting variable using println.

Kotlin

data class User(val name: String, val age: Int)

val user = User(name = "Alice", age = 30)

val greeting = user.run {
    "Hello, ${this.name}! You are ${this.age} years old."
}

# Your code here

Need a hint?

Use println(greeting) to display the message.