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Scala vs. Kotlin; Friend or Foe?
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oshai
July 02, 2018
Programming
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Scala vs. Kotlin; Friend or Foe?
Talk in scalapeno 2018
oshai
July 02, 2018
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Conflicts
Threats • Identify • Compete • Conquer https://www.americanlearninglibrary.com/search/C/caesar/caesar.html
https://ja.wikipedia.org/wiki/%E3%82%B9%E3%83%86%E3%82%A3%E3%83%B3%E3%82%AC%E3%83%BC%E3%83%9F%E3%82%B5%E3%82%A4%E3%83%AB
What is Kotlin • Statically typed • Multi-Platform (JVM first,
JS and Native) • Open Source by JetBrains https://medium.com/@octskyward/why-kotlin-is-my-next-programming-language-c25c001e26e3
Kotlin Features • Concise
Kotlin Features • Concise • Safe
Kotlin Features • Concise • Safe • Interoperable
Kotlin Features • Concise • Safe • Interoperable • Tool-friendly
Kotlin Features • Concise • Safe • Interoperable • Tool-friendly
• Fun
Side by side comparison Scala val hello: String = “hi"
var hello: String = "hi" Kotlin val hello: String = “hi" var hello: String = "hi"
Side by side comparison Scala val hello = “hi" var
hello = "hi" Kotlin val hello = “hi" var hello = "hi"
Case / data class Scala case class Service( name: String
) Kotlin data class Service( val name: String )
Null safety Scala var hello: Option[String] = None hello.foreach {
s => println(s.toUpperCase()) } println(hello.map( _.toUpperCase()) .orNull()) Kotlin var hello: String? = null println(world.toUpperCase()) if (world != null) { println(world.toUpperCase()) } println(world?.toUpperCase())
Singleton Scala object Single { } Kotlin object Single {
}
Enum Scala Coming soon… Kotlin enum class Fruits { Apple,
Banana }
Implicit class / Extension method Scala 5.hours() Kotlin 5.hours()
Implicit class / Extension method Scala object Helpers { implicit
class IntMillis(x: Int) { def hours() = TimeUnit.HOURS.toMillis(x) } } … 5.hours() Kotlin fun Int.hours() = TimeUnit.HOURS.toMillis( this.toLong()) … 5.hours()
Operator overloading Scala It’s actually methods with fancy names Kotlin
Limited to arithmetic operators + - \ * etc’
Pattern matching Scala Cool and Useful! Kotlin Very limited
Implicit conversion Scala Yes we can! Kotlin no no no!
Where Scala shines • Popularity • Evangelism https://www.cvm.org.uk/blog/demolition-squad/eight-evangelism-strategies/
Where Scala shines https://redmonk.com/sogrady/2018/03/07/language-rankings-1-18/
Where Kotlin shines • Java++ - hit the sweet spot
• Great Java inter-op • Lean • Tooling • Pragmatic - not reinventing the wheel
• Compete http://www.zimbio.com/photos/Mesut+Oezil/Germany+v+Argentina/xxHxKC8AyXD
Suggestions for Scala designers • Let’s be practical:
Suggestions for Scala designers • Let’s be practical: • Binary
compatibility https://stackoverflow.com/questions/32255023/how-would-i-go-about-parsing-the-java-class-file-constant-pool
Suggestions for Scala designers • Let’s be practical: • Binary
compatibility • Faster compilation http://www.doodleosophies.com/doodle/30
Suggestions for Scala designers • Let’s be practical: • Binary
compatibility • Faster compilation • Improve Java inter-op
Suggestions for Scala users • Stick to features exists in
Kotlin
Suggestions for Scala users • Stick to features exists in
Kotlin • Make your code readable by all team members
Suggestions for Scala users Move to Kotlin…
Question?
Thank You! @OhadShai