Lesson 1: Kotlin setup and language foundations: Concept walkthrough

Concept Explanation

This lesson introduces the Kotlin development workflow in a simple, practical way. You will run a small program, read its structure, and understand how Kotlin executes code through the main function. The goal is to make the environment feel familiar: where the program starts, how output works, and how Kotlin keeps code concise and readable. By the end, you should be comfortable opening a Kotlin file, running it, and explaining what each line of the starter example does.

Where to Put the Code

1. Define color and position variables at the top.
2. Create shape drawing or placement logic in the middle.
3. Render output (print, canvas, SVG, or styled block) at the end.

Command Reference

• Run the starter file and describe what the main function does.
• Change one printed value, rerun the program, and compare the output.
• Point out where Kotlin keeps the code shorter than a similar Java example.
• Write one sentence about why readable entry-point code matters in real projects.

Step-by-step Guide

1. Run the baseline program without changing anything.
2. Identify the entry point and explain why execution starts there.
3. Change one variable value and observe how the output changes.
4. Refactor the printed text so it reads more clearly to a real user.
5. Finish with a short note describing what this first Kotlin file teaches you.

Practice Exercises

• Create a second greeting message that uses different variable values.
• Add one more line of output that includes a string template.
• Write a tiny variation that introduces yourself instead of the course track.

Coding Challenges

• Keep the program readable while adding one extra variable and one extra print statement.
• Explain how this tiny file would scale into a larger application with multiple functions.

Mini Practice Tasks

• Rename one variable to make its purpose clearer.
• Add one meaningful improvement to the output text.
• Summarize in one line what this program demonstrates.