Object declaration syntax in Kotlin - Mini Project: Build & Apply

Object Declaration Syntax in Kotlin

📖 Scenario: You are creating a simple Kotlin program to manage a single configuration object for an app. This object will hold some settings that the app uses.

🎯 Goal: Build a Kotlin program that declares an object using Kotlin's object declaration syntax. You will create the object, add a property, add a function, and then print the result of calling that function.

📋 What You'll Learn

Declare an object called AppConfig

Inside AppConfig, create a property called version with value "1.0.0"

Inside AppConfig, create a function called getInfo that returns a string combining the text "App version: " and the version property

Print the result of calling AppConfig.getInfo()

💡 Why This Matters

🌍 Real World

Kotlin objects are used to create single instances that hold configuration, utility functions, or shared data in Android apps and Kotlin programs.

💼 Career

Understanding object declaration syntax is important for Kotlin developers to write clean, organized code and manage shared resources effectively.

1

Declare the object AppConfig

Write a Kotlin object declaration named AppConfig with no properties or functions inside.

Kotlin

object AppConfig {
    // Your code here
}

Need a hint?

Use the object keyword followed by the name AppConfig and curly braces.

2

Add a property version to AppConfig

Inside the AppConfig object, add a val property called version and set it to the string "1.0.0".

Kotlin

object AppConfig {
    // Add val version = "1.0.0" here
}

Need a hint?

Use val version = "1.0.0" inside the object.

3

Add a function getInfo to AppConfig

Inside the AppConfig object, add a function called getInfo that returns a string combining "App version: " and the version property using string templates.

Kotlin

object AppConfig {
    val version = "1.0.0"
    // Add fun getInfo() here
}

Need a hint?

Define fun getInfo(): String and return the string using "App version: $version".

4

Print the result of AppConfig.getInfo()

Write a println statement that prints the result of calling AppConfig.getInfo().

Kotlin

object AppConfig {
    val version = "1.0.0"
    fun getInfo(): String {
        return "App version: $version"
    }
}

// Print the info below

Need a hint?

Use println(AppConfig.getInfo()) inside a main function.