IArray extension methods

library/src-bootstrapped/scala/IArray.scala

@@ -38,6 +38,223 @@ object opaques
     def (arr: IArray[Double]) length: Int = arr.asInstanceOf[Array[Double]].length
     def (arr: IArray[Object]) length: Int = arr.asInstanceOf[Array[Object]].length
     def [T](arr: IArray[T]) length: Int = arr.asInstanceOf[Array[T]].length
+
+    /** Returns this array concatenated with the given array. */
+    def [T, U >: T: ClassTag](arr: IArray[T]) ++(that: IArray[U]): IArray[U] =
+      (genericArrayOps(arr) ++ that.asInstanceOf[Array[U]]).asInstanceOf[IArray[U]]
+
+    /** Tests whether this array contains a given value as an element. */
+    def [T](arr: IArray[T]) contains(elem: T): Boolean =
+      genericArrayOps(arr.asInstanceOf[Array[T]]).contains(elem)
+
+    /** Counts the number of elements in this array which satisfy a predicate */
+    def [T](arr: IArray[T]) count(p: T => Boolean): Int =
+      genericArrayOps(arr).count(p)
+
+    /** The rest of the array without its `n` first elements. */
+    def [T](arr: IArray[T]) drop(n: Int): IArray[T] =
+      genericArrayOps(arr).drop(n).asInstanceOf[IArray[T]]
+
+    /** The rest of the array without its `n` last elements. */
+    def [T](arr: IArray[T]) dropRight(n: Int): IArray[T] =
+      genericArrayOps(arr).dropRight(n).asInstanceOf[IArray[T]]
+
+    /** Drops longest prefix of elements that satisfy a predicate. */
+    def [T](arr: IArray[T]) dropWhile(p: T => Boolean): IArray[T] =
+      genericArrayOps(arr).dropWhile(p).asInstanceOf[IArray[T]]
+
+    /** Tests whether a predicate holds for at least one element of this array. */
+    def [T](arr: IArray[T]) exists(p: T => Boolean): IArray[T] =
+      genericArrayOps(arr).exists(p).asInstanceOf[IArray[T]]
+
+    /** Selects all elements of this array which satisfy a predicate. */
+    def [T](arr: IArray[T]) filter(p: T => Boolean): IArray[T] =
+      genericArrayOps(arr).filter(p).asInstanceOf[IArray[T]]
+
+    /** Selects all elements of this array which do not satisfy a predicate. */
+    def [T](arr: IArray[T]) filterNot(p: T => Boolean): IArray[T] =
+      genericArrayOps(arr).filterNot(p).asInstanceOf[IArray[T]]
+
+    /** Finds the first element of the array satisfying a predicate, if any. */
+    def [T](arr: IArray[T]) find(p: T => Boolean): Option[T] =
+      genericArrayOps(arr).find(p)
+
+    /** Builds a new array by applying a function to all elements of this array
+      * and using the elements of the resulting collections. */
+    def [T, U: ClassTag](arr: IArray[T]) flatMap(f: T => IterableOnce[U]): IArray[U] =
+      genericArrayOps(arr).flatMap(f).asInstanceOf[IArray[U]]
+
+    /** Flattens a two-dimensional array by concatenating all its rows
+      * into a single array. */
+    def [T, U: ClassTag](arr: IArray[T]) flatten(given T => Iterable[U]): IArray[U] =
+      genericArrayOps(arr).flatten.asInstanceOf[IArray[U]]
+
+    /** Folds the elements of this array using the specified associative binary operator. */
+    def [T, U >: T: ClassTag](arr: IArray[T]) fold(z: U)(op: (U, U) => U): U =
+      genericArrayOps(arr).fold(z)(op)
+
+    /** Applies a binary operator to a start value and all elements of this array,
+      * going left to right. */
+    def [T, U: ClassTag](arr: IArray[T]) foldLeft(z: U)(op: (U, T) => U): U =
+      genericArrayOps(arr).foldLeft(z)(op)
+
+    /** Applies a binary operator to all elements of this array and a start value,
+      * going right to left. */
+    def [T, U: ClassTag](arr: IArray[T]) foldRight(z: U)(op: (T, U) => U): U =
+      genericArrayOps(arr).foldRight(z)(op)
+
+    /** Tests whether a predicate holds for all elements of this array. */
+    def [T](arr: IArray[T]) forall(p: T => Boolean): Boolean =
+      genericArrayOps(arr).forall(p)
+
+    /** Apply `f` to each element for its side effects. */
+    def [T, U](arr: IArray[T]) foreach(f: T => U): Unit =
+      genericArrayOps(arr).foreach(f)
+
+    /** Selects the first element of this array. */
+    def [T](arr: IArray[T]) head: T =
+      genericArrayOps(arr).head
+
+    /** Optionally selects the first element. */
+    def [T](arr: IArray[T]) headOption: Option[T] =
+      genericArrayOps(arr).headOption
+
+    /** Finds index of first occurrence of some value in this array after or at some start index. */
+    def [T](arr: IArray[T]) indexOf(elem: T, from: Int = 0): Int =
+      genericArrayOps(arr.asInstanceOf[Array[T]]).indexOf(elem, from)
+
+    /** Finds index of the first element satisfying some predicate after or at some start index. */
+    def [T](arr: IArray[T]) indexWhere(p: T => Boolean, from: Int = 0): Int =
+      genericArrayOps(arr).indexWhere(p, from)
+
+    /** Produces the range of all indices of this sequence. */
+    def [T](arr: IArray[T]) indices: Range =
+      genericArrayOps(arr).indices
+
+    /** The initial part of the array without its last element. */
+    def [T](arr: IArray[T]) init: IArray[T] =
+      genericArrayOps(arr).init.asInstanceOf[IArray[T]]
+
+    /** Tests whether the array is empty. */
+    def [T](arr: IArray[T]) isEmpty: Boolean =
+      genericArrayOps(arr).isEmpty
+
+    /** An iterator yielding the elemenst of this array. */
+    def [T](arr: IArray[T]) iterator: Iterator[T] =
+      genericArrayOps(arr).iterator
+
+    /** Selects the last element. */
+    def [T](arr: IArray[T]) last: T =
+      genericArrayOps(arr).last
+
+    /** Optionally selects the last element. */
+    def [T](arr: IArray[T]) lastOption: Option[T] =
+      genericArrayOps(arr).lastOption
+
+    /** Finds index of last occurrence of some value in this array before or at a given end index. */
+    def [T](arr: IArray[T]) lastIndexOf(elem: T, end: Int = arr.length - 1): Int =
+      genericArrayOps(arr.asInstanceOf[Array[T]]).lastIndexOf(elem, end)
+
+    /** Finds index of last element satisfying some predicate before or at given end index. */
+    def [T](arr: IArray[T]) lastIndexWhere(p: T => Boolean, end: Int = arr.length - 1): Int =
+      genericArrayOps(arr).lastIndexWhere(p, end)
+
+    /** Builds a new array by applying a function to all elements of this array. */
+    def [T, U: ClassTag](arr: IArray[T]) map(f: T => U): IArray[U] =
+      genericArrayOps(arr).map(f).asInstanceOf[IArray[U]]
+
+    /** Tests whether the array is not empty. */
+    def [T](arr: IArray[T]) nonEmpty: Boolean =
+      genericArrayOps(arr).nonEmpty
+
+    /** A pair of, first, all elements that satisfy predicate `p` and, second, all elements that do not. */
+    def [T](arr: IArray[T]) partition(p: T => Boolean): (IArray[T], IArray[T]) =
+      genericArrayOps(arr).partition(p) match {
+        case (x, y) => (x.asInstanceOf[IArray[T]], y.asInstanceOf[IArray[T]])
+      }
+
+    /** Returns a new array with the elements in reversed order. */
+    def [T](arr: IArray[T]) reverse: IArray[T] =
+      genericArrayOps(arr).reverse.asInstanceOf[IArray[T]]
+
+    /** Computes a prefix scan of the elements of the array. */
+    def [T, U >: T: ClassTag](arr: IArray[T]) scan(z: U)(op: (U, U) => U): IArray[U] =
+      genericArrayOps(arr).scan(z)(op).asInstanceOf[IArray[U]]
+
+    /** Produces an array containing cumulative results of applying the binary
+      * operator going left to right. */
+    def [T, U: ClassTag](arr: IArray[T]) scanLeft(z: U)(op: (U, T) => U): IArray[U] =
+      genericArrayOps(arr).scanLeft(z)(op).asInstanceOf[IArray[U]]
+
+    /** Produces an array containing cumulative results of applying the binary
+      * operator going right to left. */
+    def [T, U: ClassTag](arr: IArray[T]) scanRight(z: U)(op: (T, U) => U): IArray[U] =
+      genericArrayOps(arr).scanRight(z)(op).asInstanceOf[IArray[U]]
+
+    /** The size of this array. */
+    def [T](arr: IArray[T]) size: Int =
+      arr.length
+
+    /** Selects the interval of elements between the given indices. */
+    def [T](arr: IArray[T]) slice(from: Int, until: Int): IArray[T] =
+      genericArrayOps(arr).slice(from, until).asInstanceOf[IArray[T]]
+
+    /** Sorts this array according to the Ordering which results from transforming
+      * an implicitly given Ordering with a transformation function. */
+    def [T, U: ClassTag](arr: IArray[T]) sortBy(f: T => U)(given math.Ordering[U]): IArray[T] =
+      genericArrayOps(arr).sortBy(f).asInstanceOf[IArray[T]]
+
+    /** Sorts this array according to a comparison function. */
+    def [T](arr: IArray[T]) sortWith(f: (T, T) => Boolean): IArray[T] =
+      genericArrayOps(arr).sortWith(f).asInstanceOf[IArray[T]]
+
+    /** Sorts this array according to an Ordering. */
+    def [T](arr: IArray[T]) sorted(given math.Ordering[T]): IArray[T] =
+      genericArrayOps(arr).sorted.asInstanceOf[IArray[T]]
+
+    /** Splits this array into a prefix/suffix pair according to a predicate. */
+    def [T](arr: IArray[T]) span(p: T => Boolean): (IArray[T], IArray[T]) =
+      genericArrayOps(arr).span(p) match {
+        case (x, y) => (x.asInstanceOf[IArray[T]], y.asInstanceOf[IArray[T]])
+      }
+
+    /** Splits this array into two at a given position. */
+    def [T](arr: IArray[T]) splitAt(n: Int): (IArray[T], IArray[T]) =
+      genericArrayOps(arr).splitAt(n) match {
+        case (x, y) => (x.asInstanceOf[IArray[T]], y.asInstanceOf[IArray[T]])
+      }
+
+    /** Tests whether this array starts with the given array. */
+    def [T, U >: T: ClassTag](arr: IArray[T]) startsWith(that: IArray[U], offset: Int = 0): Boolean =
+      genericArrayOps(arr).startsWith(that.asInstanceOf[Array[U]])
+
+    /** The rest of the array without its first element. */
+    def [T](arr: IArray[T]) tail: IArray[T] =
+      genericArrayOps(arr).tail.asInstanceOf[IArray[T]]
+
+    /** An array containing the first `n` elements of this array. */
+    def [T](arr: IArray[T]) take(n: Int): IArray[T] =
+      genericArrayOps(arr).take(n).asInstanceOf[IArray[T]]
+
+    /** An array containing the last `n` elements of this array. */
+    def [T](arr: IArray[T]) takeRight(n: Int): IArray[T] =
+      genericArrayOps(arr).takeRight(n).asInstanceOf[IArray[T]]
+
+    /** Takes longest prefix of elements that satisfy a predicate. */
+    def [T](arr: IArray[T]) takeWhile(p: T => Boolean): IArray[T] =
+      genericArrayOps(arr).takeWhile(p).asInstanceOf[IArray[T]]
+
+    /** Converts an array of pairs into an array of first elements and an array of second elements. */
+    def [U: ClassTag, V: ClassTag](arr: IArray[(U, V)]) unzip: (IArray[U], IArray[V]) =
+      genericArrayOps(arr).unzip match {
+        case (x, y) => (x.asInstanceOf[IArray[U]], y.asInstanceOf[IArray[V]])
+      }
+
+    /** Returns an array formed from this array and another iterable collection
+      * by combining corresponding elements in pairs.
+      * If one of the two collections is longer than the other, its remaining elements are ignored. */
+    def [T, U: ClassTag](arr: IArray[T]) zip(that: IArray[U]): IArray[(T, U)] =
+      genericArrayOps(arr).zip(that).asInstanceOf[IArray[(T, U)]]
 end opaques
 
 type IArray[+T] = opaques.IArray[T]

tests/run-bootstrapped/iarray-extmtds.check

@@ -0,0 +1,63 @@
+IArray(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20)
+true
+5
+IArray(9,10)
+IArray(1,2)
+IArray(8,9,10)
+true
+IArray(2,4,6,8,10)
+IArray(1,3,5,7,9)
+Some(5)
+IArray(1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10)
+IArray(1,2,3,4)
+55
+12345678910
+10987654321
+false
+1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+Some(1)
+-1
+3
+0,1,2,3,4,5,6,7,8,9
+IArray(1,2,3,4,5,6,7,8,9)
+false
+1,2,3
+10
+Some(20)
+6
+3
+IArray(11,12,13,14,15,16,17,18,19,20)
+true
+IArray(2,4,6,8,10)
+IArray(1,3,5,7,9)
+IArray(10,9,8,7,6,5,4,3,2,1)
+IArray(0,1,3,6,10,15,21,28,36,45,55)
+IArray(,1,12,123,1234,12345,123456,1234567,12345678,123456789,12345678910)
+IArray(10987654321,1098765432,109876543,10987654,1098765,109876,10987,1098,109,10,)
+10
+IArray(6,7)
+IArray(10,9,8,7,6,5,4,3,2,1)
+IArray(10,1,2,3,4,5,6,7,8,9)
+IArray(1,2,3,4,5,6,7,8,9,10)
+IArray(1,2,3,4)
+IArray(5,6,7,8,9,10)
+IArray(1,2,3,4,5,6,7)
+IArray(8,9,10)
+false
+IArray(2,3,4,5,6,7,8,9,10)
+IArray(1,2,3)
+IArray(7,8,9,10)
+IArray(1,2)
+IArray(1,2,3)
+IArray(1,2,3)
+IArray((1,11),(2,12),(3,13),(4,14),(5,15),(6,16),(7,17),(8,18),(9,19),(10,20))