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

inline fun <T> Array<out T>.indexOfFirst(
    predicate: (T) -> Boolean
): Int

inline fun ByteArray.indexOfFirst(
    predicate: (Byte) -> Boolean
): Int

inline fun ShortArray.indexOfFirst(
    predicate: (Short) -> Boolean
): Int

inline fun IntArray.indexOfFirst(
    predicate: (Int) -> Boolean
): Int

inline fun LongArray.indexOfFirst(
    predicate: (Long) -> Boolean
): Int

inline fun FloatArray.indexOfFirst(
    predicate: (Float) -> Boolean
): Int

inline fun DoubleArray.indexOfFirst(
    predicate: (Double) -> Boolean
): Int

inline fun BooleanArray.indexOfFirst(
    predicate: (Boolean) -> Boolean
): Int

inline fun CharArray.indexOfFirst(
    predicate: (Char) -> Boolean
): Int

@ExperimentalUnsignedTypes inline fun UIntArray.indexOfFirst(
    predicate: (UInt) -> Boolean
): Int

@ExperimentalUnsignedTypes inline fun ULongArray.indexOfFirst(
    predicate: (ULong) -> Boolean
): Int

@ExperimentalUnsignedTypes inline fun UByteArray.indexOfFirst(
    predicate: (UByte) -> Boolean
): Int

@ExperimentalUnsignedTypes inline fun UShortArray.indexOfFirst(
    predicate: (UShort) -> Boolean
): Int

Returns index of the first element matching the given predicate, or -1 if the array does not contain such element.

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

inline fun <T> Iterable<T>.indexOfFirst(
    predicate: (T) -> Boolean
): Int

Returns index of the first element matching the given predicate, or -1 if the collection does not contain such element.

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

inline fun <T> List<T>.indexOfFirst(
    predicate: (T) -> Boolean
): Int

Returns index of the first element matching the given predicate, or -1 if the list does not contain such element.