Kotlin’s invoke: it looks like a duck, quacks like a duck, but isn’t a duck

SUMMARY: Kotlin has given us a fresh perspective on some very ingrained OO-habits, particularly the pervasive use of nouns for objects that have only one public method.
This article was originally posted on jaspersprengers.nl and published here with kind permission.

Speaking like a native

Pronouncing a foreign language so convincingly that you can pass for a native speaker is one of the hardest tricks to pull off. While it comes natural to young children it is something that very few adults ever master. That is because our ears have become attuned to the speech habits of our native language and we interpret every foreign language according to these patterns. Continue reading

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KotlinConf 2018 – Amsterdam!

After the success of KotlinConf 2017 in San Francisco a follow-up was certainly not outside the realm of imagination. Jetbrains has found a venue that’s slightly better to reach for us Europeans, which is exciting news!

KotlinConf 2018 will be held in Amsterdam from October 3rd to October 5th!

If you are interesting in speaking, the call for papers is open already. More information here: KotlinConf 2018 – Call for speakers.

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Eindhoven Java User Group: Kotlin Meetup

If you are interested in setting your first steps in Kotlin and live south of the big rivers in The Netherlands, we’ve got good news:

The Eindhoven Java User Group is organizing a Kotlin Meetup on January 30th 2018.

Be there to learn all about the newest JVM language and its feature-set and find some time to interact with other Kotlin enthusiasts.

More info: Kotlin Meetup Eindhoven

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Meetup at Bol.com: Java8 and Kotlin

Bol.com is planning another meetup covering Kotlin on Wednesday the 17th of February, with speakers from Blue4IT and Bol.com.

The evening will have two main topics, the first talk by Brian Vermeer will be about Java 8, the good the bad and the ugly. Sadly, there’s no abstract to post here, as soon as it turns up we’ll add it to the post.

The second talk by Silvan van Leeuwen and Alan van Dam will cover Kotlin.

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Kotlin: DSL Development

As all of us who write Java on a daily basis have experienced, we tend to spend a considerable amount of time writing boilerplate code. We can sometimes refactor that boilerplate away by using specialized classes for certain activities, but that doesn’t always bring us the right results. Reducing repetitive boilerplate can also be achieved by creating a DSL, a domain-specific language that can help us describe anything in a concise and targeted way whilst moving the actual work out of sight.

Kotlin has the tools on board to allow us to write type-safe DSL logic. In this post we’ll dive a bit deeper into how you could use them to your advantage. Here’s a quick preview of what we’ll be building:

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