# kotlinx.atomicfu The idiomatic way to use atomic operations in [Kotlin/JS](https://kotlinlang.org/docs/reference/js-overview.html), so that the same code can be shared with Kotlin/JVM. ```kotlin private val top = atomic(null) ``` See [README](https://github.com/Kotlin/kotlinx.atomicfu/blob/master/README.md) for more details.