Lesson 1

Getting Started with Kotlin: Syntax, Comments, and Your First Program

Introduction and Objectives

Hello there! Today is a milestone as we step into Kotlin, a user-friendly, yet powerful language, popular in mobile and web programming spheres. This lesson will acquaint you with the basics of Kotlin, including syntax, comments, and writing your first print statement — fundamental concepts for entering the Kotlin world.

A Brief on Kotlin Syntax

Understanding a language starts with its syntax — the structure and rules that govern how the code is written — which serves as the backbone of any programming language. For instance, let's consider this straightforward Kotlin statement:

Kotlin
1println("Hello, World!")

println is a built-in Kotlin function that prints the argument provided to it. In our case, the argument is the string "Hello, World!".

Exploring Comments in Kotlin

Comments are crucial in coding as they improve the readability of your code, making it easy to understand not only for others but for you as well in the future. Comments are added with the purpose of making the code easier for humans to understand, and they do not affect the code execution in any way. Kotlin offers both single-line and multi-line comments.

Here is a single-line comment:

Kotlin
1// This is a single-line comment in Kotlin

Multi-line comments spread across multiple lines and are enclosed within /* */:

Kotlin
1/* 2This 3is 4a 5multi-line 6comment 7in 8Kotlin 9*/

Think of comments as notes in your coding diary — they explain your code and enhance its comprehensibility.

Crafting Our First Kotlin Print Program

Now, let's write our first Kotlin program based on what we've learned so far. We'll use the println function to write a simple print statement. While the convention is to print "Hello, World!", feel free to print whatever you like.

Kotlin
1fun main() { 2 println("Hello, CodeSignal!") 3}

Here, we've defined the main function. When a Kotlin program is run, the main function is always executed. We then called println within main to print "Hello, CodeSignal!" to the console.

Reinforcement and Conclusion

Great work! You've taken your first steps in Kotlin, covering the essentials: Kotlin syntax, the importance and use of comments, and crafting a basic println program.

Remember, reinforcing the skills you've gained through practice is invaluable. Stay tuned for the upcoming exercises that are designed to solidify today's learning. Keep up the good work, and continue enjoying this Kotlin expedition! We're just getting started!

Enjoy this lesson? Now it's time to practice with Cosmo!

Practice is how you turn knowledge into actual skills.