Kotlin 输出 HelloWorld

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package top.blackcyan.kt
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fun main() {
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    println("Hello, world!")
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}

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package top.blackcyan.kt
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val message: ListOf<String> = ["Hello ", "world!"]
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message.forEach {
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    print(it)
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}
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println()

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package top.blackcyan.kt
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fun greeting() = "Hello"
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fun String.printOut() {
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    println("${greeting()} $this!")
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}
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fun main() {
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    "world".printOut()
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}