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Kotlin Academy · Lesson

Sharing Business Logic

Reuse across iOS and Android.

Why Share Business Logic?

UI differs per platform, but rules like validation, pricing, and data flow are identical. Sharing them in commonMain removes duplication and bugs.

Shared Data Models

Define your domain models once in common code. With kotlinx.serialization they also serialize identically on both platforms.

import kotlinx.serialization.Serializable

@Serializable
data class Product(val id: Int, val name: String, val price: Double)

All lessons in this course

  1. KMM Project Structure
  2. expect and actual
  3. Sharing Business Logic
  4. Platform APIs
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