adam-arold

val list = listOf("foo.bar", "baz.qux")
list.forEach {
    it.split(".").forEach {
        println(it)
    }
}

adam-arold

list.forEach { item ->
    item.split(".").forEach { part ->
        println(part)
    }
}

adam-arold

data class Foo(val bars: MutableList<String>)

adam-arold

val bars = mutableListOf("foobar", "wombar")
val foo0 = Foo(bars)
val foo1 = foo0.copy()
bars.add("oops")
println(foo1.bars.joinToString())

adam-arold

val bars = listOf("foobar", "wombar")

data class Foo(val bars: List<String>)

adam-arold

class MyApi {
    fun operation0() {
    }
    internal fun hiddenOperation() {            
    }
}

adam-arold

interface MyApi {
    fun operation0()
}
class MyApiImpl: MyApi {
    override fun operation0() {
    }
    internal fun hiddenOperation() {
    }
}

adam-arold

fun String.extractCustomerName() : String {
    // ...
}

adam-arold

/**
 * Returns an element of this [List] wrapped in an Optional
 * which is empty if `idx` is out of bounds.
 */
fun <T> List<T>.getIfPresent(idx: Int) =
        if (idx >= size) {
            Optional.empty()
        } else {
            Optional.of(get(idx))
        }

adam-arold

fun consumeText(text: String, fn: (String) -> Unit) {
}
// usage
consumeText("foo") {
    println(it)
}