Summary - KMP

Combine commonMain, expect/actual and platform targets to write a KMP library.

Summary - KMP

In this group you learned KMP, commonMain, expect/actual, the iOS and JS targets. Now you will write a model that combines them: a shared info function.

Your kmpSummary function represents the commonMain logic; it returns the string "KMP: common + expect". In main you will call this function and print the result. This is the typical KMP combination: shared code, the expect/actual bridge and platform targets in one flow.

Combining: commonMain + expect/actual + targets

Now we combine all parts. commonMain holds the shared logic; expect/actual builds the platform bridge; the iOS and JS targets produce the output.

Example: fun kmpSummary(): String = "KMP: common + expect". This function lives in commonMain; every target can call it. In main you write println(kmpSummary()). This simple model summarises the shared logic + platform bridge flow of KMP.

Exercise Write kmpSummary

Define fun kmpSummary(): String. It should return "KMP: common + expect". In main, write println(kmpSummary()).

Show example solution

fun kmpSummary(): String = "KMP: common + expect"
fun main() {
    println(kmpSummary())
}

Test yourself

What is the core structure of KMP?
```
KMP is built from shared and target sets.
```
- One platform
- One source set
- Only iOS
- commonMain + platform sets
Show answer

commonMain + platform sets — KMP consists of commonMain and platform source sets.

Complete the kmpSummary string

fun kmpSummary(): String = "____"

Show answer

fun kmpSummary(): String = "KMP: common + expect"

Match the KMP concepts

commonMain

Shared code
expect/actual

Platform bridge
iosArm64()

iPhone target
js()

JS target

Next lesson: Compose MP

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