Android Development with Kotlin

Android Development with Kotlin

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1. Kotlin Basics

In this section, we will delve into the basic syntax of Kotlin, understand how it works, and learn the fundamentals of working with it. Discover variables, data types, functions, and much more!

Why Kotlin for Android Development?

Basic Syntax and Structure of Kotlin

Data Types in Kotlin

Challenge: Variables and Data Types

Using Functions

Conditionals and Logic

Challenge: Conditionals and Logic

2. Control Flow and Collections

In this section, you will learn how to store and work with data sets and arrays using controlled loops and various operations. We will also look at higher-order functions and much more!

Introduction to Loops

Collections: Lists and Arrays

Challenge: Working with Collections

Filtering and Modifying Lists

Functions as First-Class Citizens

Null Safety and Safe Calls

Challenge: Null Safety

3. Object-Oriented Programming in Kotlin

In Android development, various paradigms are constantly used, but most often, it's the OOP paradigm. Learn what it is and how to use it in Kotlin. Create your own classes, methods, and objects to successfully manipulate to achieve incredible results!

Classes and Objects

Inheritance and Interfaces

Course Content

Android Development with Kotlin

Android Development with Kotlin

1. Kotlin Basics

Why Kotlin for Android Development?Basic Syntax and Structure of Kotlin Data Types in Kotlin Challenge: Variables and Data Types Functions Using Functions Conditionals and Logic Challenge: Conditionals and Logic

2. Control Flow and Collections

Introduction to Loops Collections: Lists and Arrays Maps and Sets Challenge: Working with Collections Filtering and Modifying Lists Functions as First-Class Citizens Null Safety and Safe Calls Challenge: Null Safety

3. Object-Oriented Programming in Kotlin

Classes and Objects Inheritance and Interfaces Data Classes

Challenge: Variables and Data Types

Let's move on to practice!

You already know what variables and data types exist in Kotlin, so it's time to test your knowledge with a simple task.

In this task, you need to determine the way of declaration for each variable (var or val). Then, you should assign data types to these variables. Afterward, subtract the discount amount from the item price, store this value in a variable named price, and finally, print the value of this variable to the console.

It's not as difficult as it sounds, and you can always use hints or peek at the solution for guidance!

Main


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fun main() {
    val productName: ___ = "Bread"
    var price: ___ = 13.80F
    val discount: ___ = 4

    // calculate the price after discount and print it to the console
    price = ___
    print("Price after the discount is ___")
}

Determine the declaration type for each variable (var or val).
Assign data types to these variables.
Subtract the discount amount from the product price and save this value in the variable price.
Print the value of the price variable to the console.

Input:

fun main() {
val productName: String = "Bread"
var price: Float = 13.80F
val discount: Int = 4

// calculate the price after discount and print it to the console
price = price - discount
print("Price after the discount is $price")
}

Output:

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Section 1. Chapter 4

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