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Where We Stand & What’s Next
Andrey Breslav
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Learning materials
• kotlinlang.org
– Language Reference
– API Reference
– Tutorials
– Talk Videos
• try.kotlinlang.org
– Mini-IDE in your browser
– Kotlin Koans
• Kotlin EDU Plug-in
• + books, and much more
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Where We Stand
• Kotlin 1.0 released in Feb, 2016
– 1.0.1 in March
– 1.0.2 in May
– 1.0.3 in the summer
• 1.1 is feature-driven
– EAP will start this summer
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Others like it (and so will you J)
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You are not alone
• Lively community
– Slack, Forums, StackOverflow
– 100+ OSS contributors
• Responsive Team
– Regular bugfix updates
– Frequent EAP builds
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KEEP
• Kotlin Evolu\on & Enhancement Process
– Proposals from JB and Community
– Feedback
– Discussions
• h_ps://github.com/Kotlin/KEEP
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OUR PLANS
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Lines of Development
• 1.0.X — incremental updates
– Bugfixes, Performance
– Tooling
– Source Compa7bility*: Full
• 1.1 — language release
– Language features
– Source Compa7bility*: Backward
* modulo bugfixes
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Tooling Plans: 1.0.X
• Incremental compila\on in Gradle
• Spring Support in the IDE
• Reducing the Standard Library Size
• Android Lint Checks
• Jack&Jill Support
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New Targets
• Java 8/9
– Generate default methods in interfaces
– Support new collec\on APIs (Streams etc)
• JavaScript
– Run\me modules (amd, umd, common.js, …)
– Common toolchains (npm, browserify, gulp, ...)
• Na\ve
– iOS
– Embedded
– Server-side
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Scrip\ng: example.kts
#!/usr/bin/kotlin
import java.io.*
for (file in File(“.”).listFiles())
println(file.name)
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Type Aliases
typealias Int32 = Int
typealias Predicate = (T) -> Boolean
• Not a “newtype”
– Int can be assigned to Int32 and vice versa
– Value types will cover the newtype use case (later)
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Bound Method References
val p: Predicate = “foo”::equals
// behaves as { x -> “foo”.equals(x) }
val c: KClass = x.foo()::class
• Kotlin 1.0 only supports Type::foo/Type::class
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Enhancements for Proper\es
• Local delegated proper\es
– fun foo() {
val lazyBar by lazy { ... }
while (...) {
if (...) {
lazyBar.doBaz()
...
}
• Inline proper\es
– val foo: Foo
inline get() = ...
inline set(v) { ... }
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Hierarchies for Data Classes
data class User(val name: String, val age: Int)
– equals()/hashCode()/toString()
– copy()
• val newUser = someUser.copy(name = “Jane Doe”)
– componentN()
• val (name, age) = someUser
• sealed class C() {
data class Example(…) : C()
}
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Destructuring in Lambdas
myMap.forEach {
(k, v) ->
println(“$k => $v”)
}
Map.Entry
destructured
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async/await
fun loadImage(url: URL) = async {
val bytes = await(loadBytes(url))
bytesToImage(bytes)
}
Suspension point
Asynchronous
computa\on
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Corou\nes
• Covers async/await/yield, and much more
• Maximum flexibility
– Support for virtually all exis\ng asynchronous APIs
– Language is not bound to a given Task framework
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Corou\nes: Example
fun loadImage(url: URL) = async {
val bytes = await(loadBytes(url))
bytesToImage(bytes)
}
Library Func\ons,
not keywords!
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Conclusion
• Come take part in KEEP
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And
One
More
Thing…
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Images used
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