Multiplatform Projectsの向かう先 #m3kt

Transcript

1. 5 / 8 # 2013

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         # 2013 /

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5. ! # 1/02 fun main(args: Array<String>) { println("Hello world!") }

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   kotlin.io.readLine000 JVM 58 # 3126 / / fun

   main(args: Array<String>) { val name = readLine() println("Hello $name!") }

7. # 2013 / / import java.io.BufferedReader import java.io.File fun main(args:

   Array<String>) { val name = File("name.txt") .bufferedReader() .use { it.readLine() } println("Hello $name!") }

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    # # 2 /-1 0 # fun main(args: Array<String>) { println("Hello world!") } 20021 2 /-1 5

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     • 15 2/ 2/- 0 1 # *5 2/

    3 1 fun main(args: Array<String>) { val name = readLine() println("Hello $name!") } *5 2/ 8

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     # 53 01 / 1 # import java.io.BufferedReader import

    java.io.File fun main(args: Array<String>) { val name = File("name.txt") .bufferedReader() .use { it.readLine() } println("Hello $name!") } 01 / 28

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     • /350-2 5 0- # # # 8 350-2

    1 /5 # fun main(args: Array<String>) { window.alert("Hello World!") } 350-2

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         # 2013 / /

15. 
       # 1/02 expect object Hello { fun

    say() }

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     # 2013 / / actual object Hello {

    actual fun say() = showDialog("Hello!") } actual object Hello { actual fun say() = window.alert("Hello!") }

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    / expect open class BigInteger(`val`: String) { open fun add(`val`: BigInteger): BigInteger } actual typealias BigInteger = java.math.BigInteger
     

18. • ,8 , 31132 13 0, 0 351 13 0,

    # # # 3 0 2 1 / # fun main(args: Array<String>) { val bi = BigInteger(”10”) val sum = bi.add(BigInteger(”20”)) ... }
    

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    0 2 1 / fun main(args: Array<String>) { val bi = BigInteger(”10”) val div = bi.divide(BigInteger(”5”)) ... }
    

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    8 4 K • 53354 58204 C TS K # 58204 3 18 val hoge: dynamic = object {} hoge.fuga = {} // OK hoge.piyo().xxx.yyy() // OK

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    2 3 23 3 8 K # 8 03 / 3 expect class System { companion object { fun currentTimeMillis(): Long } } // NG actual typealias System = java.lang.System

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    0 5 8 K 8 31 2 32 3 6 K # 360 2 1 /6 // OK actual class System { actual companion object { actual fun currentTimeMillis() = java.lang.System.currentTimeMillis() } }

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    0 5 8 K 8 31 2 32 3 K # 3 0 2 1 / // OK actual fun System.Companion.currentTimeMillis() = java.lang.System.currentTimeMillis() class System { companion object } expect fun System.Companion.currentTimeMillis(): Long

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