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Kotlin 1.4.0-RC Kotlin愛好会 vol.23

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About Me ● Matthew Vern / Panini ● Twitter: @panini_ja Github: panpanini ● Mercari, Inc ● Android Engineer (US) ● Kotlin可愛い

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Summary ● Kotlin 1.4 Release Candidate is ready! ● Let’s look at some interesting Kotlin 1.4 language features ● Let’s also look at some new behaviour changes

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New Language Features

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SAM conversions for Kotlin classes

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Trailing Commas

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Behaviour Changes

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Smart cast in generic lambda expression

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Companion Object INSTANCE visibility ● Originally only accessible from Java ● Even if the Companion Object is defined as private, the INSTANCE would be public

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Summary

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Summary ● A few new language features to make Kotlin easier to use ○ SAM conversion for Kotlin interfaces ○ Trailing comma in parameter lists ● Many Quality of Life (QoL) changes, makes Kotlin even more 可愛い ○ Smart cast in generic lambda ● Lets try Kotlin 1.4 EAP! ○ https://blog.jetbrains.com/kotlin/2020/07/kotlin-1-4-rc-released/

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Have a nice Kotlin!