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Kotlin Multiplatform Academy · Lesson

What Is NOT in Common stdlib

JVM-only APIs to avoid in commonMain.

Common Has Limits

Not every Kotlin API is multiplatform. The common stdlib is a careful subset, and many familiar JVM tools are missing.

No java.* in Common

Anything under java packages is JVM-only. It compiles on Android but breaks the moment iOS tries to build it.

All lessons in this course

  1. Strings, Numbers & Collections Everywhere
  2. map, filter & fold in Shared Code
  3. Dates with kotlinx-datetime
  4. What Is NOT in Common stdlib
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