ฟังก์ชันทักทายใน commonMain

Code you put in commonMain is shared by every platform. It is the heart of KMP, so this is where your first function will live.

Inside commonMain you write pure Kotlin with no Android or iOS imports. If it compiles here, it runs the same on both apps.

Your first shared piece is a small greeting function. It takes a name and returns a friendly line that both apps can show. 👋

Declare it with fun and give it one parameter. This single line of Kotlin is now available to Android and iOS alike.

Kotlin string templates read cleaner than joining with plus. The dollar sign drops a value straight into the text.

The : String after the parentheses promises a String comes back. Both platforms rely on that contract being honored.

A good shared function is pure: same input, same output, no logging or UI. That is exactly what makes it safe everywhere.

Kotlin lets you set a default value, so callers can skip the argument. Both apps then get a sensible greeting for free.

Save it under commonMain/kotlin in your shared module. The folder is the signal to KMP that this code targets every platform.

You did not need a class. A top-level function in a file is perfectly fine and keeps tiny shared utilities simple.

This single greet function is the one source of truth. Change the wording once and every platform speaks the same way. ✨

Let us check where shared code belongs.

You wrote your first shared function in commonMain: pure Kotlin, a clear return type, and one source of truth for both apps. 🎉