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Oct 2020
Adopt?

Arrow is promoted as the functional companion for Kotlin's standard library. Indeed, the package of ready-to-use higher-level abstractions delivered by Arrow has proven so useful that our teams now consider Arrow a sensible default when working with Kotlin. Recently, in preparation for the 1.0 release, the Arrow team introduced several changes, including the addition of new modules but also some deprecations and removals.

Nov 2019
Trial?

Arrow is a functional programming library for Kotlin, created by merging two existing popular libraries (kategory and funKTionale). While Kotlin provides building blocks for functional programming, Arrow delivers a package of ready-to-use higher-level abstractions for application developers. It provides data types, type classes, effects, optics and other functional programming patterns as well as integrations with popular libraries. Our initial positive impressions of Arrow were confirmed when using it to build applications that are now in production.

Apr 2019
Assess?

Arrow is a functional programming library for Kotlin, created by merging two existing popular libraries (kategory and funKTionale). While Kotlin provides building blocks for functional programming, Arrow delivers a package of ready-to-use higher-level abstractions for application developers. It provides data types, type classes, effects, optics and other functional programming patterns as well as integrations with popular libraries. With Arrow, existing libraries are unified, which should go a long way to avoid fractured communities in this space.