Packages

  • package root
    Definition Classes
    root
  • package strawman
    Definition Classes
    root
  • package collection

    A strawman architecture for new collections.

    A strawman architecture for new collections. It contains some example collection classes and methods with the intent to expose some key issues. It would be good to compare this to odether implementations of the same functionality, to get an idea of the strengths and weaknesses of different collection architectures.

    For a test file, see tests/run/CollectionTests.scala.

    Strawman6 is like strawman5, and adds lazy lists (i.e. lazie streams), arrays and some utilitity methods (take, tail, mkString, toArray). Also, systematically uses builders for all strict collections.

    Types covered in this strawman:

    1. Collection base types:

    IterableOnce, Iterable, Seq, LinearSeq, View, IndexedView

    2. Collection creator base types:

    FromIterable, IterableFactory, Buildable, Builder

    3. Types that bundle operations:

    IterableOps, IterableMonoTransforms, IterablePolyTransforms, IterableLike SeqMonoTransforms, SeqLike

    4. Concrete collection types:

    List, LazyList, ListBuffer, ArrayBuffer, ArrayBufferView, StringView, ArrayView

    5. Decorators for existing types

    StringOps, ArrayOps

    6. Related non collection types:

    Iterator, StringBuilder

    Operations covered in this strawman:

    1. Abstract operations, or expected to be overridden:

    For iterables:

    iterator, fromIterable, fromIterableWithSameElemType, knownLength, className

    For sequences:

    apply, length

    For buildables:

    newBuilder

    For builders:

    +=, result

    2. Utility methods, might be overridden for performance:

    Operations returning not necessarily a collection:

    foreach, foldLeft, foldRight, indexWhere, isEmpty, head, size, mkString

    Operations returning a collection of a fixed type constructor:

    view, to, toArray, copyToArray

    Type-preserving generic transforms:

    filter, partition, take, drop, tail, reverse

    Generic transforms returning collections of different element types:

    map, flatMap, ++, zip

    Definition Classes
    strawman
  • object IndexedView
    Definition Classes
    collection
  • Drop
  • Map
  • Reverse
  • Take

class Drop[A] extends View.Take[A] with IndexedView[A]

Linear Supertypes
IndexedView[A], ArrayLike[A], View.Take[A], Serializable, Serializable, Product, Equals, View[A], Iterable[A], IterableLike[A, View], IterablePolyTransforms[A, View], IterableMonoTransforms[A, View[A]], IterableOps[A], FromIterable[View], IterableOnce[A], AnyRef, Any
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  2. By Inheritance
Inherited
  1. Drop
  2. IndexedView
  3. ArrayLike
  4. Take
  5. Serializable
  6. Serializable
  7. Product
  8. Equals
  9. View
  10. Iterable
  11. IterableLike
  12. IterablePolyTransforms
  13. IterableMonoTransforms
  14. IterableOps
  15. FromIterable
  16. IterableOnce
  17. AnyRef
  18. Any
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Visibility
  1. Public
  2. All

Instance Constructors

  1. new Drop(underlying: IndexedView[A], n: Int)

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. def ++[B >: A](xs: IterableOnce[B]): View[B]

    Concatenation

    Concatenation

    Definition Classes
    IterablePolyTransforms
  4. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  5. def apply(i: Int): A
    Definition Classes
    Drop → ArrayLike
  6. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  7. def className: String

    The class name of this collection.

    The class name of this collection. To be used for converting to string. Collections generally print like this:

    <className>(elem_1, ..., elem_n)

    Definition Classes
    View → IterableOps
  8. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  9. def coll: Drop.this.type

    The collection itself

    The collection itself

    Attributes
    protected
    Definition Classes
    Iterable → IterablePolyTransforms → IterableMonoTransforms → IterableOps
  10. def copyToArray[B >: A](xs: Array[B], start: Int = 0): xs.type

    Copy all elements of this collection to array xs, starting at start.

    Copy all elements of this collection to array xs, starting at start.

    Definition Classes
    IterableOps
  11. def drop(n: Int): IndexedView[A]

    The rest of the collection without its n first elements.

    The rest of the collection without its n first elements. For linear, immutable collections this should avoid making a copy.

    Definition Classes
    IndexedView → IterableMonoTransforms
  12. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  13. def filter(p: (A) ⇒ Boolean): View[A]

    All elements satisfying predicate p

    All elements satisfying predicate p

    Definition Classes
    IterableMonoTransforms
  14. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  15. def flatMap[B](f: (A) ⇒ IterableOnce[B]): View[B]

    Flatmap

    Flatmap

    Definition Classes
    IterablePolyTransforms
  16. def foldLeft[B](z: B)(op: (B, A) ⇒ B): B

    Fold left

    Fold left

    Definition Classes
    IterableOps
  17. def foldRight[B](z: B)(op: (A, B) ⇒ B): B

    Fold right

    Fold right

    Definition Classes
    IterableOps
  18. def foreach[U](f: (A) ⇒ U): Unit

    Apply f to each element for its side effects Note: [U] parameter needed to help scalac's type inference.

    Apply f to each element for its side effects Note: [U] parameter needed to help scalac's type inference.

    Definition Classes
    IterableOps
  19. def fromIterable[B](c: Iterable[B]): View[B]

    Avoid copying if source collection is already a view.

    Avoid copying if source collection is already a view.

    Definition Classes
    View → IterablePolyTransforms → FromIterable
  20. def fromIterableWithSameElemType(coll: Iterable[A]): View[A]

    Create a collection of type C[A] from the elements of coll, which has the same element type as this collection.

    Create a collection of type C[A] from the elements of coll, which has the same element type as this collection. Overridden in StringOps and ArrayOps.

    Attributes
    protected[this]
    Definition Classes
    View → IterableLike → IterableMonoTransforms
  21. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
  22. def head: A

    The first element of the collection.

    The first element of the collection.

    Definition Classes
    IterableOps
  23. def indexWhere(p: (A) ⇒ Boolean): Int

    The index of the first element in this collection for which p holds.

    The index of the first element in this collection for which p holds.

    Definition Classes
    IterableOps
  24. def isEmpty: Boolean

    Is the collection empty?

    Is the collection empty?

    Definition Classes
    IterableOps
  25. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  26. def iterator(): Iterator[A]

    Iterator can be used only once

    Iterator can be used only once

    Definition Classes
    Drop → IndexedView → Take → IterableOnce
  27. def knownSize: Int

    The number of elements in this collection, if it can be cheaply computed, -1 otherwise.

    The number of elements in this collection, if it can be cheaply computed, -1 otherwise. Cheaply usually means: Not requiring a collection traversal.

    Definition Classes
    Take → IterableOps
  28. def length: Int
    Definition Classes
    Drop → ArrayLike
  29. def map[B](f: (A) ⇒ B): IndexedView[B]

    Map

    Map

    Definition Classes
    IndexedView → IterablePolyTransforms
  30. def mkString(sep: String): String

    A string showing all elements of this collection, separated by string sep.

    A string showing all elements of this collection, separated by string sep.

    Definition Classes
    IterableOps
  31. val n: Int
    Definition Classes
    Take
  32. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  33. def nonEmpty: Boolean

    Is the collection not empty?

    Is the collection not empty?

    Definition Classes
    IterableOps
  34. val normN: Int
    Attributes
    protected
    Definition Classes
    Take
  35. final def notify(): Unit
    Definition Classes
    AnyRef
  36. final def notifyAll(): Unit
    Definition Classes
    AnyRef
  37. def partition(p: (A) ⇒ Boolean): (View[A], View[A])

    A pair of, first, all elements that satisfy prediacte p and, second, all elements that do not.

    A pair of, first, all elements that satisfy prediacte p and, second, all elements that do not. Interesting because it splits a collection in two.

    The default implementation provided here needs to traverse the collection twice. Strict collections have an overridden version of partition in Buildable, which requires only a single traversal.

    Definition Classes
    IterableMonoTransforms
  38. def reverse: IndexedView[A]
    Definition Classes
    IndexedView
  39. def size: Int

    The number of elements in this collection.

    The number of elements in this collection. Does not terminate for infinite collections.

    Definition Classes
    IterableOps
  40. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  41. def tail: View[A]

    The rest of the collection without its first element.

    The rest of the collection without its first element.

    Definition Classes
    IterableMonoTransforms
  42. def take(n: Int): IndexedView[A]

    A collection containing the first n elements of this collection.

    A collection containing the first n elements of this collection.

    Definition Classes
    IndexedView → IterableMonoTransforms
  43. def to[C[X] <: Iterable[X]](fi: FromIterable[C]): C[A]

    Given a collection factory fi for collections of type constructor C, convert this collection to one of type C[A].

    Given a collection factory fi for collections of type constructor C, convert this collection to one of type C[A]. Example uses:

    xs.to(List) xs.to(ArrayBuffer)

    Definition Classes
    IterableOps
  44. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]

    Convert collection to array.

    Convert collection to array.

    Definition Classes
    IterableOps
  45. def toString(): String
    Definition Classes
    IterableOps → Any
  46. val underlying: Iterable[A]
    Definition Classes
    Take
  47. def view: View[A]

    A view representing the elements of this collection.

    A view representing the elements of this collection.

    Definition Classes
    View → IterableOps
  48. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  49. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  50. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  51. def zip[B](xs: IterableOnce[B]): View[(A, B)]

    Zip.

    Zip. Interesting because it requires to align to source collections.

    Definition Classes
    IterablePolyTransforms

Inherited from IndexedView[A]

Inherited from ArrayLike[A]

Inherited from View.Take[A]

Inherited from Serializable

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from View[A]

Inherited from Iterable[A]

Inherited from IterableLike[A, View]

Inherited from IterablePolyTransforms[A, View]

Inherited from IterableMonoTransforms[A, View[A]]

Inherited from IterableOps[A]

Inherited from FromIterable[View]

Inherited from IterableOnce[A]

Inherited from AnyRef

Inherited from Any

Ungrouped