This latest release reintroduces the min(), max(), minBy(), maxBy(), minWidth() and maxWith() functions, which now return the collection element or throw an exception: fun main() ')) Comparable functions such as minBy(), maxBy(), minWidth() and maxWidth() were also renamed to include OrNull() at the end of the function name. Since the release of Kotlin 1.4, the min() and max() collections functions were renamed to minOrNull() and maxOrNull() since they return null when the collection is empty. To use these new features in version 1.7.0-Beta, configure the build scripts from the Early Access Preview.

Starting with version 1.7.0, 'Milestone' releases are now called 'Beta' releases to align with the standard software release life cycle terminology, where 'Beta' means that no new features are added and the focus is on stabilizing the features with the help of feedback from the community. Regular expressions now support named capturing groups in Kotlin/JS and Kotlin/Native and allow checking for exact matches at specific positions. We can achieve this by simply extending the Java Optional class as follows: fun Optional.toNullable(): T? = this.JetBrains has released Kotlin 1.7.0-Beta, enabling builder inference and definitely non-nullable types by default and reintroducing the min(), max(), minBy(), maxBy(), minWidth() and maxWith() functions. Ideally this should be available on any Java Optional object (in our project only). So all I need is a simple piece of code that converts a Java Optional into a Kotlin Nullable. They enable us to add functionality to classes that we cannot change or subclass, for example as it is final. I already knew the concept of extensions from Swift and found that Kotlin also supports extensions. Since we are implementing in Kotlin we would like to use Kotlin Nullables instead and as it turned out we can achieve this very easily. Using this API out of the box would force us to deal with cumbersome Java Optionals. This library is written in Java, hence method signatures look like this: Optional findById(ID var1) We are using a CrudRepository that provides basic functionalities like save(), delete(), findById() etc. This includes Spring Boot Jpa Repositories.

We are using Kotlin and Spring Boot in one of our projects.

Kotlin optional to nullable