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Jake Wharton A Builder's Intro to Kotlin

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Kotlin?

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Why Kotlin?

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Plugin Author

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Plugin Author Buildscript Author

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Plugin Author Buildscript Author App Developer

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val firstName: String = "Jake"
 val lastName: String? = null

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val firstName: String = "Jake"
 val lastName: String? = null

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val firstName: String = "Jake"
 val lastName: String? = null

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val firstName: String = "Jake"
 val lastName: String? = null

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val firstName: String = "Jake"
 val lastName: String? = null

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val firstName = "Jake"
 val lastName: String? = null

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class User {
 public String getName() {
 // ...
 }
 public void setName(String name) {
 // ...
 }
 } // ^^^ Java

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class User {
 public String getName() {
 // ...
 }X
 public void setName(String name) {
 // ...
 }Y
 }Z // ^^^ Java vvv Kotlin val user = User()
 println("Name is " + user.name)

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class User {
 public String getName() {
 // ...
 }X
 public void setName(String name) {
 // ...
 }Y
 }Z // ^^^ Java vvv Kotlin val user = User()
 println("Name is " + user.name)X

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class User {
 public String getName() {
 // ...
 }X
 public void setName(String name) {
 // ...
 }Y
 }Z // ^^^ Java vvv Kotlin val user = User()
 println("Name is ${user.name}")X

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class User {
 public String getName() {
 // ...
 }X
 public void setName(String name) {
 // ...
 }Y
 }Z // ^^^ Java vvv Kotlin val user = User()
 println("Name is $user")X

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class User {
 public String getName() {
 // ...
 }X
 public void setName(String name) {
 // ...
 }Y
 }Z // ^^^ Java vvv Kotlin val user = User()
 println("Name is $user")X

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class User {
 var name = "Jake"
 } // ^^^ Kotlin

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class User {
 var name = "Jake"
 } // ^^^ Kotlin vvv Java User user = new User(); System.out.println("Name is " + user.getName());

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class User {
 var name = "Jake"
 } // ^^^ Kotlin vvv Java User user = new User(); System.out.println("Name is " + user.getName());

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class User {
 var name = "Jake"
 } // ^^^ Kotlin vvv Java User user = new User(); System.out.println("Name is " + user.getName()); user.setName("Jane");

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class User {
 var name = "Jake"
 } // ^^^ Kotlin vvv Java User user = new User(); System.out.println("Name is " + user.getName()); user.setName("Jane");

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val user = User()

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val user = User()
 user = User()

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val user = User()
 user = User()
 
 var currentUser = User()
 currentUser = User()

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fun Date.isTuesday(): Boolean {
 return day == 2
 }

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fun Date.isTuesday(): Boolean {
 return day == 2
 } val epoch = Date(1970, 0, 0)
 if (epoch.isTuesday()) {
 println("The epoch was a Tuesday.")
 } else {
 println("The epoch was not a Tuesday.")
 }

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fun Date.isTuesday(): Boolean {
 return day == 2
 } val epoch = Date(1970, 0, 0)
 if (epoch.isTuesday()) {
 println("The epoch was a Tuesday.")
 } else {
 println("The epoch was not a Tuesday.")
 }

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fun Date.isTuesday(): Boolean {
 return day == 2
 } val epoch = Date(1970, 0, 0)
 if (epoch.isTuesday()) {
 println("The epoch was a Tuesday.")
 } else {
 println("The epoch was not a Tuesday.")
 } // ^^^ Kotlin vvv Java DateKt.isTuesday(date)

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val executor = Executors.newSingleThreadExecutor();
 executor.execute {Bprintln("Background thread!") }X

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val executor = Executors.newSingleThreadExecutor(); val foo = Foo()
 executor.execute(foo::printIt) class Foo { fun printIt() {B println("Background thread!") }X }

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val executor = Executors.newSingleThreadExecutor(); val foo = Foo()
 executor.execute(foo::printIt) class Foo { fun printIt() {B println("Background thread!") }X }

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fun List.filter(predicate: (T) -> Boolean): List {
 // ...
 }

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fun List.filter(predicate: (T) -> Boolean): List {
 // ...
 }

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fun List.filter(predicate: (T) -> Boolean): List {
 // ...
 }A val items = listOf(1, 2, 3) val odds = items.filter({ item -> item % 2 != 0 })B

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fun List.filter(predicate: (T) -> Boolean): List {
 // ...
 }A val items = listOf(1, 2, 3) val odds = items.filter({ item -> item % 2 != 0 })B

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fun List.filter(predicate: (T) -> Boolean): List {
 // ...
 }A val items = listOf(1, 2, 3) val odds = items.filter({ it % 2 != 0 })B

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fun List.filter(predicate: (T) -> Boolean): List {
 // ...
 }A val items = listOf(1, 2, 3) val odds = items.filter()B{ it % 2 != 0 }

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fun List.filter(predicate: (T) -> Boolean): List {
 // ...
 }A val items = listOf(1, 2, 3) val odds = items.filter { it % 2 != 0 }

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fun List.filter(predicate: (T) -> Boolean): List {
 // ...
 }A val items = listOf(1, 2, 3) val oddList = items.filter { it % 2 != 0 } val oddSet = items.filterTo(mutableListOf()) { it % 2 != 0 }

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fun List.filter(predicate: (T) -> Boolean): List {
 // ...
 }A val items = listOf(1, 2, 3) val odds = items.filter { it % 2 != 0 }

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inline fun List.filter(predicate: (T) -> Boolean): List {
 // ...
 }A val items = listOf(1, 2, 3) val odds = items.filter { it % 2 != 0 }

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inline fun List.filter(predicate: (T) -> Boolean): List { val destination = mutableListOf() for (item in this) { if (predicate(item)) destination.add(item) }B return destination }A val items = listOf(1, 2, 3) val odds = items.filter { it % 2 != 0 } val destination = mutableListOf< >() for (item in ) { if ( item ) destination.add(item) }G destination

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inline fun List.filter(predicate: (T) -> Boolean): List { val destination = mutableListOf() for (item in this) { if (predicate(item)) destination.add(item) }B return destination }A val items = listOf(1, 2, 3) val destination = mutableListOf() for (item in items) { if (item % 2 != 0) destination.add(item) }G val odds = destination filter it

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fun List.filterIsInstance(c: Class): List {
 val destination = mutableListOf() for (item in this) { if (c.isInstance(item)) destination.add(item) } return destination
 }A

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fun List.filterIsInstance(c: Class): List {
 val destination = mutableListOf() for (item in this) { if (c.isInstance(item)) destination.add(item) }G return destination
 }A

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fun List.filterIsInstance(): List {
 val destination = mutableListOf() for (item in this) { if (item in T) destination.add(item) }G return destination
 }A c: Class
 c.isInstance( )

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fun List.filterIsInstance(): List {
 val destination = mutableListOf() for (item in this) { if (item in T) destination.add(item) }G return destination
 }A

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inline fun List.filterIsInstance(): List {
 val destination = mutableListOf() for (item in this) { if (item in T) destination.add(item) }G return destination
 }A

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inline fun List.filterIsInstance(): List {
 val destination = mutableListOf() for (item in this) { if (item in T) destination.add(item) }G return destination
 }A

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inline fun List.filterIsInstance(): List {
 val destination = mutableListOf() for (item in this) { if (item in T) destination.add(item) }G return destination
 }A

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inline fun List.filterIsInstance(): List {
 val destination = mutableListOf() for (item in this) { if (item in T) destination.add(item) } return destination
 }A val list = listOf(1, 2f, 3, 4f) val ints = list.filterIsInstance()

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inline fun List.filterIsInstance(): List {
 val destination = mutableListOf() for (item in this) { if (item in T) destination.add(item) } return destination
 }A val list = listOf(1, 2f, 3, 4f) val ints = list.filterIsInstance() ALOAD 7 # item INSTANCEOF java/lang/Integer IFEQ L8 ALOAD 5 # destination ALOAD 7 # item INVOKEINTERFACE java/util/Collection.add (Ljava/lang/Object;)Z

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class User {D
 val name = "Jake"
 }A

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class User(name: String) {D
 val name = name
 }A 
 "Jake"

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class User(val name: String) {
 }A

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class User(val name: String)

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class User(val name: String) val jake = User("Jake") println("Hello, $jake!")

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class User(val name: String) val jake = User("Jake") println("Hello, $jake!") Hello, User@3a71f4dd!

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data class User(val name: String) val jake = User("Jake") println("Hello, $jake!") Hello, User@3a71f4dd!

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@3a71f4dd data class User(val name: String) val jake = User("Jake") println("Hello, $jake!") Hello, User(name=Jake)!

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data class User(val name: String) val jake = User("Jake") println("Hello, $jake!") Hello, User(name=Jake)!

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class UserPersisence(db: SqlDatabase) { private val deleteByName = db.createStatement("DELETE FROM user WHERE name = ?") fun delete(name: String) { deleteByName.bind(1, name) deleteByName.execute() } }

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class UserPersisence(db: SqlDatabase) { private val deleteByName = db.createStatement("DELETE FROM user WHERE name = ?") fun delete(name: String) { deleteByName.bind(1, name) deleteByName.execute() }B }A

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class UserPersisence(db: SqlDatabase) { private val deleteByName by lazy { db.createStatement("DELETE FROM user WHERE name = ?") }C fun delete(name: String) { deleteByName.bind(1, name) deleteByName.execute() }B }A

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val deleteByName by lazy { db.createStatement("DELETE FROM user WHERE name = ?") }C

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val deleteByName by lazy { db.createStatement("DELETE FROM user WHERE name = ?") }C var name by Delegates.observable("Jane") { prop, old, new -> println("Name changed from $old to $new") }

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val deleteByName by lazy { db.createStatement("DELETE FROM user WHERE name = ?") }C var name by Delegates.observable("Jane") { prop, old, new -> println("Name changed from $old to $new") } var address by Delegates.notNull()

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val deleteByName by lazy { db.createStatement("DELETE FROM user WHERE name = ?") }C var name by Delegates.observable("Jane") { prop, old, new -> println("Name changed from $old to $new") } var address by Delegates.notNull() val nameView by bindView(R.id.name)

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val deleteByName by lazy { db.createStatement("DELETE FROM user WHERE name = ?") }C var name by Delegates.observable("Jane") { prop, old, new -> println("Name changed from $old to $new") } var address by Delegates.notNull() val nameView by bindView(R.id.name)

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fun main(vararg args: String) = runBlocking { val jobs = List(100_000) { launch(CommonPool) { delay(1000L) print(".") } } jobs.forEach { it.join() } }

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Plugin Author Buildscript Author App Developer

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Plugin Author Buildscript Author App Developer

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apply plugin: 'org.jetbrains.kotlin.jvm'

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apply plugin: 'org.jetbrains.kotlin.jvm' src/ main/ java/ Fizz.java Buzz.java

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apply plugin: 'org.jetbrains.kotlin.jvm' src/ main/ java/ Fizz.java Buzz.kt

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*.java *.kt

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*.java *.kt kotlinc

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*.java *.kt kotlinc

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*.java *.kt kotlinc javac

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*.java *.kt kotlinc javac

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*.java *.kt kotlinc javac

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kotlin-stdlib *.java *.kt kotlinc javac

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kotlin-stdlib *.java *.kt kotlinc javac

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kotlin-stdlib *.java *.kt kotlinc javac project(':some-library')

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apply plugin: 'org.jetbrains.kotlin.jvm'

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apply plugin: 'org.jetbrains.kotlin.jvm' apply plugin: 'org.jetbrains.kotlin.android'

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apply plugin: 'org.jetbrains.kotlin.jvm' apply plugin: 'org.jetbrains.kotlin.android' apply plugin: 'kotlin2js'

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apply plugin: 'org.jetbrains.kotlin.jvm' apply plugin: 'org.jetbrains.kotlin.android' apply plugin: 'kotlin2js' apply plugin: 'konan' # Different classpath dependency

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apply plugin: 'org.jetbrains.kotlin.jvm' apply plugin: 'org.jetbrains.kotlin.android' apply plugin: 'kotlin2js' apply plugin: 'konan' # Different classpath dependency or apply plugin: 'org.jetbrains.kotlin.platform.common' apply plugin: 'org.jetbrains.kotlin.platform.jvm' apply plugin: 'org.jetbrains.kotlin.platform.js' apply plugin: 'konan' # Different classpath dependency

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Plugin Author Buildscript Author App Developer

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Plugin Author Buildscript Author App Developer

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apply plugin: 'org.jetbrains.kotlin.jvm' apply plugin: 'org.jetbrains.kotlin.kapt' sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 dependencies { compile deps.kotlin.stdLibJre8 compile deps.javaPoet compile deps.autoCommon compileOnly deps.autoService kapt deps.autoService testCompile deps.junit testCompile deps.truth testCompile deps.compileTesting }

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apply plugin: 'org.jetbrains.kotlin.jvm' apply plugin: 'org.jetbrains.kotlin.kapt' sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 dependencies { compile deps.kotlin.stdLibJre8 compile deps.javaPoet compile deps.autoCommon compileOnly deps.autoService kapt deps.autoService testCompile deps.junit testCompile deps.truth testCompile deps.compileTesting }

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apply(plugin: 'org.jetbrains.kotlin.jvm')X apply plugin: 'org.jetbrains.kotlin.kapt' sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 dependencies { compile deps.kotlin.stdLibJre8 compile deps.javaPoet compile deps.autoCommon compileOnly deps.autoService kapt deps.autoService testCompile deps.junit testCompile deps.truth testCompile deps.compileTesting }

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apply(singletonMap('plugin', 'org.jetbrains.kotlin.jvm'))X apply plugin: 'org.jetbrains.kotlin.kapt' sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 dependencies { compile deps.kotlin.stdLibJre8 compile deps.javaPoet compile deps.autoCommon compileOnly deps.autoService kapt deps.autoService testCompile deps.junit testCompile deps.truth testCompile deps.compileTesting }

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apply(singletonMap('plugin', 'org.jetbrains.kotlin.jvm'))X apply plugin: 'org.jetbrains.kotlin.kapt' sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 dependencies { compile deps.kotlin.stdLibJre8 compile deps.javaPoet compile deps.autoCommon compileOnly deps.autoService kapt deps.autoService testCompile deps.junit testCompile deps.truth testCompile deps.compileTesting }

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apply(singletonMap('plugin', 'org.jetbrains.kotlin.jvm'))X apply plugin: 'org.jetbrains.kotlin.kapt' sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 dependencies { compile deps.kotlin.stdLibJre8 compile deps.javaPoet compile deps.autoCommon compileOnly deps.autoService kapt deps.autoService testCompile deps.junit testCompile deps.truth testCompile deps.compileTesting }

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apply(singletonMap('plugin', 'org.jetbrains.kotlin.jvm'))X apply plugin: 'org.jetbrains.kotlin.kapt' sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 dependencies { compile deps.kotlin.stdLibJre8 compile(deps.javaPoet) compile deps.autoCommon compileOnly deps.autoService kapt deps.autoService testCompile deps.junit testCompile deps.truth testCompile deps.compileTesting }

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apply(singletonMap('plugin', 'org.jetbrains.kotlin.jvm'))X apply plugin: 'org.jetbrains.kotlin.kapt' sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 dependencies { compile deps.kotlin.stdLibJre8 compile(deps.javaPoet) compile deps.autoCommon compileOnly deps.autoService kapt deps.autoService testCompile deps.junit testCompile deps.truth testCompile deps.compileTesting }

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android { // ... testOptions { unitTests.all { systemProperty('robolectric.dependency.repo.id', 'example-nexus') systemProperty('robolectric.dependency.repo.url', 'https://nexus.example.com/content/groups/public') } } }

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android { // ... testOptions { unitTests.all { systemProperty('robolectric.dependency.repo.id', 'example-nexus') systemProperty('robolectric.dependency.repo.url', 'https://nexus.example.com/content/groups/public') } } }

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android { // ... testOptions { unitTests.all { systemProperty('robolectric.dependency.repo.id', 'example-nexus') systemProperty('robolectric.dependency.repo.url', 'https://nexus.example.com/content/groups/public') }
 
 }

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apply plugin: 'org.jetbrains.kotlin.jvm' apply plugin: 'org.jetbrains.kotlin.kapt' sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 dependencies { compile deps.kotlin.stdLibJre8 compile deps.javaPoet compile deps.autoCommon compileOnly deps.autoService kapt deps.autoService testCompile deps.junit testCompile deps.truth testCompile deps.compileTesting }A java build.gradle

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apply { plugin('org.jetbrains.kotlin.jvm') plugin('org.jetbrains.kotlin.kapt') } java { sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } dependencies { compile(deps.kotlin.stdLibJre8) compile(deps.javaPoet) compile(deps.autoCommon) compileOnly(deps.autoService) kapt(deps.autoService) testCompile(deps.junit) testCompile(deps.truth) testCompile(deps.compileTesting) }A build.gradle.kts

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apply { plugin('org.jetbrains.kotlin.jvm') plugin('org.jetbrains.kotlin.kapt') } java { sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } dependencies { compile(deps.kotlin.stdLibJre8) compile(deps.javaPoet) compile(deps.autoCommon) compileOnly(deps.autoService) kapt(deps.autoService) testCompile(deps.junit) testCompile(deps.truth) testCompile(deps.compileTesting) }A build.gradle.kts

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apply { plugin('org.jetbrains.kotlin.jvm') plugin('org.jetbrains.kotlin.kapt') } java { sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } dependencies { compile(deps.kotlin.stdLibJre8) compile(deps.javaPoet) compile(deps.autoCommon) compileOnly(deps.autoService) kapt(deps.autoService) testCompile(deps.junit) testCompile(deps.truth) testCompile(deps.compileTesting) }A build.gradle.kts

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apply { plugin('org.jetbrains.kotlin.jvm') plugin('org.jetbrains.kotlin.kapt') } java { sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } dependencies { compile(deps.kotlin.stdLibJre8) compile(deps.javaPoet) compile(deps.autoCommon) compileOnly(deps.autoService) kapt(deps.autoService) testCompile(deps.junit) testCompile(deps.truth) testCompile(deps.compileTesting) }A build.gradle.kts

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apply { plugin('org.jetbrains.kotlin.jvm') plugin('org.jetbrains.kotlin.kapt') } java { sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } dependencies { compile(deps.kotlin.stdLibJre8) compile(deps.javaPoet) compile(deps.autoCommon) compileOnly(deps.autoService) kapt(deps.autoService) testCompile(deps.junit) testCompile(deps.truth) testCompile(deps.compileTesting) }A build.gradle.kts

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apply { plugin('org.jetbrains.kotlin.jvm') plugin('org.jetbrains.kotlin.kapt') } java { sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } dependencies { compile(deps.kotlin.stdLibJre8) compile(deps.javaPoet) compile(deps.autoCommon) compileOnly(deps.autoService) kapt(deps.autoService) testCompile(deps.junit) testCompile(deps.truth) testCompile(deps.compileTesting) }A build.gradle.kts

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Plugin Author Buildscript Author App Developer

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Plugin Author Buildscript Author App Developer

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class MyPlugin : Plugin { override fun apply(project: Project) { // ... }B }A

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import org.gradle.kotlin.dsl.* class MyPlugin : Plugin { override fun apply(project: Project) { // ... }B }A

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kotlin-stdlib *.java *.kt kotlinc javac

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kotlin-stdlib *.java *.kt kotlinc javac apply plugin: 'your-gradle-plugin'

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+

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jakewharton jakewharton jakewharton twitter.com/ github.com/ .com A Builder's Intro to Kotlin