In Kotlin, the when can be used as an expression or statement. If using ‘when’ as an expression then the satisfied branch’s value becomes the value of the overall expression. In the case of using it as a statement, the values of the individual branches are ignored.

然而， Kotlin 中 when 表达式能够干你想用 switch 干的每件事，甚至更多。 实际上，在你的代码中，你可以用 when 替换复杂的 if/else 语句。 Kotlin 的 when 表达式 . 开始，你可以像 switch 那样使用 when 。例如，想象你有一个视图，基于视图可显示性显示提示。 你可以做：

Instead of the widely used switch statement, Kotlin provides the more flexible and clear when construction. It can be used either as a statement or as an expression. Kotlin break Expression. In this tutorial, you will learn to use break to terminate a loop. Also, you will also learn about break labels. Document Kotlin code: KDoc and Dokka. The language used to document Kotlin code (the equivalent of Java's JavaDoc) is called KDoc.In its essence, KDoc combines JavaDoc's syntax for block tags (extended to support Kotlin's specific constructs) and Markdown for inline markup.

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然后: 否则），因为普通的if 就能胜任  when. У Kotlin есть ключевое слово when, которое заменяет оператор switch и позволяет делать более сложные вещи. Выражение when имеет больше  Apr 29, 2019 Can Kotlin, the latest language to join the JVM, supersede its predecessor Java? Let's compare the two languages that are currently battling for  Exposes the JavaScript Option to Kotlin.

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Build Spring Boot Apps with the Kotlin Programming Language. Intermediate; 7h 47m; Released:  Kotlin is a modern language, suitable for everything from mobile apps to cloud computing.

they can’t be inherited from any other class. So, to make it inheritable from other classes, we use the open keyword with the class, function, and variable name. Kotlin is quickly rising up the ranks of programming language popularity. One of the main reasons is that Kotlin, like other multiplatform frameworks and languages, is not UI-centric or existing on as a layer on top of something else. Rather, it focuses on the app's logic.
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Note that when is an expression, so it is evaluated and can be assigned to a variable. In this case, it will evaluate to a string, which will be assigned to the reaction variable. Kotlin has great support and many contributors in its fast-growing global community. Enjoy the benefits of a rich ecosystem with a wide range of community libraries.

when (transaction.state) { Transaction.Type.EXPIRED, //about 10 more types Transaction.Type.BLOCKED -> { if (transaction.type == Transaction.Type.BLOCKED && transaction.closeAnyway) { close (transaction) break //close if type is blocked and has 'closeAnyway' flag } //common logic } //other types } Kotlin's when expression is used to evaluate multiple conditions. It is a more powerful version of Java's switch statement. The when keyword matches its argument against all branches sequentially until some branch condition is satisfied. It can be used either as an expression or as a statement.
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If you're experienced with Scala, when is  Apr 5, 2019 At runtime, the wrapped type of an inline class will be used without its wrapper whenever possible. This is similar to Java's boxed types like  When is one of the control flow of Kotlin. If you are coming from java, When is a bit similar to Switch. Even if you don't know java, think When as powerful nested if   控制流：if、when、for、while. If 表达式. 在Kotlin 中，if是一个表达式，即它会返回 一个值。 因此就不需要三元运算符（条件?

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In the case of using it as a statement, the values of the individual branches are ignored.