operator fun <T> Iterator<T>.iterator(): Iterator<T>
Returns the given iterator itself. This allows to use an instance of iterator in a for loop.
import java.util.*
fun main(args: Array<String>) {
//sampleStart
val mutableList = mutableListOf(1, 2, 3)
val mutableIterator = mutableList.iterator()
// iterator() extension is called here
for (e in mutableIterator) {
if (e % 2 == 0) {
// we can remove items from the iterator without getting ConcurrentModificationException
// because it's the same iterator that is iterated with for loop
mutableIterator.remove()
}
println("The element is $e")
}
//sampleEnd
}operator fun <K, V> Map<out K, V>.iterator(): Iterator<Entry<K, V>>
Returns an Iterator over the entries in the Map.
import kotlin.test.*
import java.util.*
fun main(args: Array<String>) {
//sampleStart
val map = mapOf("beverage" to 2.7, "meal" to 12.4, "dessert" to 5.8)
for ((key, value) in map) {
println("$key - $value") // prints: beverage - 2.7
// prints: meal - 12.4
// prints: dessert - 5.8
}
//sampleEnd
}@JvmName("mutableIterator") operator fun <K, V> MutableMap<K, V>.iterator(): MutableIterator<MutableEntry<K, V>> Returns a MutableIterator over the mutable entries in the MutableMap.
© 2010–2020 JetBrains s.r.o. and Kotlin Programming Language contributors
Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/iterator.html