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Kotlin 101
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Ivan Bruel
October 21, 2015
Programming
2
1.2k
Kotlin 101
A brief overview on how Kotlin works and how it pairs alongside Java in an Android world.
Ivan Bruel
October 21, 2015
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Transcript
Kotlin 101 @ BLOCO.IO
Ivan Bruel Mobile Developer @ Faber Ventures twitter.com/ivanbruel github.com/ivanbruel
Faber-Dev Bruno Oliveira Mobile Developer Afonso Tsukamoto Backend Developer João
Horta Frontend Developer Marcelo Lebre Lead Developer Ivan Bruel Mobile Developer
Android and Java A brief history lesson
Java 6 2006 Android 1.0 2008 Java 7 2011 Java
7 support 2013 Java 8 2014 Java 8 support ??? Android and Java Timeline
Lollipop 20% KitKat 43% Jelly Bean 29% Ice Cream Sandwich
4% Gingerbread 4% Platform versions Android and Java
Java 7 63% Java 6 37% Android and Java Java
versions
What’s wrong with Java? Aside from installing the Ask toolbar
What’s wrong with Java? Null references
What’s wrong with Java? Raw types
What’s wrong with Java? Covariant Arrays
What’s wrong with Java? Checked Exceptions
Kotlin Statically typed programming language for the JVM, Android and
the browser
Kotlin Why does it matter? 100% interoperable with Java Java
6 compatible
Kotlin What does it remove from Java? Checked Exceptions Non-class
primitive types Non-private fields Static members Wildcard types
Kotlin What’s new? Lambdas Properties Data classes Primary constructors Function
literals & inline functions Class delegation Extension functions Type inference Null-safety Singletons Smart casts Declaration-site variance String templates Range expressions
Kotlin How does it work? Kotlin source Java source kotlinc
javac bytecode Android ART Dalvik
Kotlin Hello, World! { }
Kotlin Hello, World!
Kotlin Type inference
Kotlin Null-safety NullPointerException Optional Safe!
Kotlin Smart casts Smart cast Smart cast
Kotlin String templates
Kotlin Range expressions
Kotlin Higher order functions and lambdas
Kotlin In-line functions
Kotlin Extension functions
Kotlin Properties and Constructors
Kotlin Properties and Constructors
Kotlin Singletons
Kotlin Companion objects
Kotlin But wait, there’s more! kotlinlang.org “Why Kotlin is my
next programming language” @ medium reddit.com/r/kotlin stackoverflow.com
Get to know us faber-ventures.com
[email protected]