diff --git a/generators/builtins/unsignedTypes.kt b/generators/builtins/unsignedTypes.kt
index 8a347d86925..b5cbbd57009 100644
--- a/generators/builtins/unsignedTypes.kt
+++ b/generators/builtins/unsignedTypes.kt
@@ -19,6 +19,7 @@ fun generateUnsignedTypes(
 ) {
     for (type in UnsignedType.values()) {
         generate(File(targetDir, "kotlin/${type.capitalized}.kt")) { UnsignedTypeGenerator(type, it) }
+        generate(File(targetDir, "kotlin/${type.capitalized}Array.kt")) { UnsignedArrayGenerator(type, it) }
     }
 
     generate(File(targetDir, "kotlin/UIterators.kt"), ::UnsignedIteratorsGenerator)
@@ -193,3 +194,54 @@ class UnsignedIteratorsGenerator(out: PrintWriter) : BuiltInsSourceGenerator(out
         }
     }
 }
+
+class UnsignedArrayGenerator(val type: UnsignedType, out: PrintWriter) : BuiltInsSourceGenerator(out) {
+    val elementType = type.capitalized
+    val arrayType = elementType + "Array"
+    val arrayTypeOf = elementType.toLowerCase() + "ArrayOf"
+    val storageElementType = type.asSigned.capitalized
+    val storageArrayType = storageElementType + "Array"
+    override fun generateBody() {
+        out.println("public inline class $arrayType internal constructor(private val storage: $storageArrayType) : Collection<$elementType> {")
+        out.println(
+            """
+    /** Returns the array element at the given [index]. This method can be called using the index operator. */
+    public operator fun get(index: Int): $elementType = storage[index].to$elementType()
+
+    /** Sets the element at the given [index] to the given [value]. This method can be called using the index operator. */
+    public operator fun set(index: Int, value: $elementType) {
+        storage[index] = value.to$storageElementType()
+    }
+
+    /** Returns the number of elements in the array. */
+    public override val size: Int get() = storage.size
+
+    /** Creates an iterator over the elements of the array. */
+    public override operator fun iterator(): ${elementType}Iterator = Iterator(storage)
+
+    private class Iterator(private val array: $storageArrayType) : ${elementType}Iterator() {
+        private var index = 0
+        override fun hasNext() = index < array.size
+        override fun next$elementType() = if (index < array.size) array[index++].to$elementType() else throw NoSuchElementException(index.toString())
+    }
+
+    override fun contains(element: $elementType): Boolean = storage.contains(element.to$storageElementType())
+
+    override fun containsAll(elements: Collection<$elementType>): Boolean = elements.all { storage.contains(it.to$storageElementType()) }
+
+    override fun isEmpty(): Boolean = this.storage.size == 0"""
+        )
+
+        out.println("}")
+
+        out.println("""
+public /*inline*/ fun $arrayType(size: Int, init: (Int) -> $elementType): $arrayType {
+    return $arrayType($storageArrayType(size) { index -> init(index).to$storageElementType() })
+}
+
+public fun $arrayTypeOf(vararg elements: $elementType): $arrayType {
+    return $arrayType(elements.size) { index -> elements[index] }
+}"""
+        )
+    }
+}
diff --git a/libraries/stdlib/unsigned/src/kotlin/UByteArray.kt b/libraries/stdlib/unsigned/src/kotlin/UByteArray.kt
new file mode 100644
index 00000000000..f5b44712b52
--- /dev/null
+++ b/libraries/stdlib/unsigned/src/kotlin/UByteArray.kt
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license 
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+// Auto-generated file. DO NOT EDIT!
+
+package kotlin
+
+public inline class UByteArray internal constructor(private val storage: ByteArray) : Collection<UByte> {
+
+    /** Returns the array element at the given [index]. This method can be called using the index operator. */
+    public operator fun get(index: Int): UByte = storage[index].toUByte()
+
+    /** Sets the element at the given [index] to the given [value]. This method can be called using the index operator. */
+    public operator fun set(index: Int, value: UByte) {
+        storage[index] = value.toByte()
+    }
+
+    /** Returns the number of elements in the array. */
+    public override val size: Int get() = storage.size
+
+    /** Creates an iterator over the elements of the array. */
+    public override operator fun iterator(): UByteIterator = Iterator(storage)
+
+    private class Iterator(private val array: ByteArray) : UByteIterator() {
+        private var index = 0
+        override fun hasNext() = index < array.size
+        override fun nextUByte() = if (index < array.size) array[index++].toUByte() else throw NoSuchElementException(index.toString())
+    }
+
+    override fun contains(element: UByte): Boolean = storage.contains(element.toByte())
+
+    override fun containsAll(elements: Collection<UByte>): Boolean = elements.all { storage.contains(it.toByte()) }
+
+    override fun isEmpty(): Boolean = this.storage.size == 0
+}
+
+public /*inline*/ fun UByteArray(size: Int, init: (Int) -> UByte): UByteArray {
+    return UByteArray(ByteArray(size) { index -> init(index).toByte() })
+}
+
+public fun ubyteArrayOf(vararg elements: UByte): UByteArray {
+    return UByteArray(elements.size) { index -> elements[index] }
+}
diff --git a/libraries/stdlib/unsigned/src/kotlin/UIntArray.kt b/libraries/stdlib/unsigned/src/kotlin/UIntArray.kt
new file mode 100644
index 00000000000..b6afcd3d4be
--- /dev/null
+++ b/libraries/stdlib/unsigned/src/kotlin/UIntArray.kt
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license 
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+// Auto-generated file. DO NOT EDIT!
+
+package kotlin
+
+public inline class UIntArray internal constructor(private val storage: IntArray) : Collection<UInt> {
+
+    /** Returns the array element at the given [index]. This method can be called using the index operator. */
+    public operator fun get(index: Int): UInt = storage[index].toUInt()
+
+    /** Sets the element at the given [index] to the given [value]. This method can be called using the index operator. */
+    public operator fun set(index: Int, value: UInt) {
+        storage[index] = value.toInt()
+    }
+
+    /** Returns the number of elements in the array. */
+    public override val size: Int get() = storage.size
+
+    /** Creates an iterator over the elements of the array. */
+    public override operator fun iterator(): UIntIterator = Iterator(storage)
+
+    private class Iterator(private val array: IntArray) : UIntIterator() {
+        private var index = 0
+        override fun hasNext() = index < array.size
+        override fun nextUInt() = if (index < array.size) array[index++].toUInt() else throw NoSuchElementException(index.toString())
+    }
+
+    override fun contains(element: UInt): Boolean = storage.contains(element.toInt())
+
+    override fun containsAll(elements: Collection<UInt>): Boolean = elements.all { storage.contains(it.toInt()) }
+
+    override fun isEmpty(): Boolean = this.storage.size == 0
+}
+
+public /*inline*/ fun UIntArray(size: Int, init: (Int) -> UInt): UIntArray {
+    return UIntArray(IntArray(size) { index -> init(index).toInt() })
+}
+
+public fun uintArrayOf(vararg elements: UInt): UIntArray {
+    return UIntArray(elements.size) { index -> elements[index] }
+}
diff --git a/libraries/stdlib/unsigned/src/kotlin/ULongArray.kt b/libraries/stdlib/unsigned/src/kotlin/ULongArray.kt
new file mode 100644
index 00000000000..6dadead7316
--- /dev/null
+++ b/libraries/stdlib/unsigned/src/kotlin/ULongArray.kt
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license 
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+// Auto-generated file. DO NOT EDIT!
+
+package kotlin
+
+public inline class ULongArray internal constructor(private val storage: LongArray) : Collection<ULong> {
+
+    /** Returns the array element at the given [index]. This method can be called using the index operator. */
+    public operator fun get(index: Int): ULong = storage[index].toULong()
+
+    /** Sets the element at the given [index] to the given [value]. This method can be called using the index operator. */
+    public operator fun set(index: Int, value: ULong) {
+        storage[index] = value.toLong()
+    }
+
+    /** Returns the number of elements in the array. */
+    public override val size: Int get() = storage.size
+
+    /** Creates an iterator over the elements of the array. */
+    public override operator fun iterator(): ULongIterator = Iterator(storage)
+
+    private class Iterator(private val array: LongArray) : ULongIterator() {
+        private var index = 0
+        override fun hasNext() = index < array.size
+        override fun nextULong() = if (index < array.size) array[index++].toULong() else throw NoSuchElementException(index.toString())
+    }
+
+    override fun contains(element: ULong): Boolean = storage.contains(element.toLong())
+
+    override fun containsAll(elements: Collection<ULong>): Boolean = elements.all { storage.contains(it.toLong()) }
+
+    override fun isEmpty(): Boolean = this.storage.size == 0
+}
+
+public /*inline*/ fun ULongArray(size: Int, init: (Int) -> ULong): ULongArray {
+    return ULongArray(LongArray(size) { index -> init(index).toLong() })
+}
+
+public fun ulongArrayOf(vararg elements: ULong): ULongArray {
+    return ULongArray(elements.size) { index -> elements[index] }
+}
diff --git a/libraries/stdlib/unsigned/src/kotlin/UShortArray.kt b/libraries/stdlib/unsigned/src/kotlin/UShortArray.kt
new file mode 100644
index 00000000000..0dd3a113a37
--- /dev/null
+++ b/libraries/stdlib/unsigned/src/kotlin/UShortArray.kt
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license 
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+// Auto-generated file. DO NOT EDIT!
+
+package kotlin
+
+public inline class UShortArray internal constructor(private val storage: ShortArray) : Collection<UShort> {
+
+    /** Returns the array element at the given [index]. This method can be called using the index operator. */
+    public operator fun get(index: Int): UShort = storage[index].toUShort()
+
+    /** Sets the element at the given [index] to the given [value]. This method can be called using the index operator. */
+    public operator fun set(index: Int, value: UShort) {
+        storage[index] = value.toShort()
+    }
+
+    /** Returns the number of elements in the array. */
+    public override val size: Int get() = storage.size
+
+    /** Creates an iterator over the elements of the array. */
+    public override operator fun iterator(): UShortIterator = Iterator(storage)
+
+    private class Iterator(private val array: ShortArray) : UShortIterator() {
+        private var index = 0
+        override fun hasNext() = index < array.size
+        override fun nextUShort() = if (index < array.size) array[index++].toUShort() else throw NoSuchElementException(index.toString())
+    }
+
+    override fun contains(element: UShort): Boolean = storage.contains(element.toShort())
+
+    override fun containsAll(elements: Collection<UShort>): Boolean = elements.all { storage.contains(it.toShort()) }
+
+    override fun isEmpty(): Boolean = this.storage.size == 0
+}
+
+public /*inline*/ fun UShortArray(size: Int, init: (Int) -> UShort): UShortArray {
+    return UShortArray(ShortArray(size) { index -> init(index).toShort() })
+}
+
+public fun ushortArrayOf(vararg elements: UShort): UShortArray {
+    return UShortArray(elements.size) { index -> elements[index] }
+}