Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)

operator fun <T> Array<out T>.component1(): T

operator fun ByteArray.component1(): Byte

operator fun ShortArray.component1(): Short

operator fun IntArray.component1(): Int

operator fun LongArray.component1(): Long

operator fun FloatArray.component1(): Float

operator fun DoubleArray.component1(): Double

operator fun BooleanArray.component1(): Boolean

operator fun CharArray.component1(): Char

@ExperimentalUnsignedTypes operator fun UIntArray.component1(): UInt

@ExperimentalUnsignedTypes operator fun ULongArray.component1(): ULong

@ExperimentalUnsignedTypes operator fun UByteArray.component1(): UByte

@ExperimentalUnsignedTypes operator fun UShortArray.component1(): UShort

Returns 1st element from the array.

If the size of this array is less than 1, throws an IndexOutOfBoundsException except in Kotlin/JS where the behavior is unspecified.

Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)

operator fun <T> List<T>.component1(): T

Returns 1st element from the list.

Throws an IndexOutOfBoundsException if the size of this list is less than 1.

Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)

operator fun <K, V> Entry<K, V>.component1(): K

Returns the key component of the map entry.

This method allows to use destructuring declarations when working with maps, for example:

for ((key, value) in map) {
    // do something with the key and the value
}