``` val port = System getenv PORT toOption flatMap it toIntO kotlinlang #arrow

``` val port = System.getenv("PORT").toOption().fl...

thanerian

03/08/2019, 4:06 PM

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val port = System.getenv("PORT").toOption().flatMap { it.toIntOrNull().toOption() }.getOrElse(8080)

here is a similar using extension function provided by arrow

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