kotlin-stdlib / kotlin.native / setULongAt setULongAt Native 1.3 @ExperimentalNativeApi @ExperimentalUnsignedTypes fun ByteArray.setULongAt( index: Int, value: ULong)(source) Sets ULong out of the ByteArray byte buffer at specified index index Exceptions IndexOutOfBoundsException - if index is outside of array boundaries.