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When expressions have always been powerful, but in Kotlin 2.1 it is becoming even more powerful with guards. Learn more in this video!

To enable it:

Ensure you are using Kotlin 2.1.0 or later in your project
Add -Xwhen-guards as a compiler argument
For IDE support:

Use the latest 2024.3 version of IntelliJ IDEA with K2 mode enabled (requires restar