struct LazyMapCollection<Base : CollectionType, Element>| Inheritance |
CollectionType, Indexable, LazyCollectionType, LazySequenceType, SequenceType
View Protocol Hierarchy →
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| Associated Types | |
| Import | import Swift |
Initializers
Create an instance with elements transform(x) for each element
x of base.
Deprecated: it will be removed in Swift 3, use '.lazy.map' on the collection.
Declaration
init(_ base: Base, transform: (Base.Generator.Element) -> Element)
Instance Variables
Returns the number of elements.
Complexity: O(1) if Index conforms to RandomAccessIndexType;
O(N) otherwise.
Declaration
var count: Base.Index.Distance { get }
Declared In
LazyMapCollection
, LazyCollectionType
, CollectionType
Declaration
var first: Element? { get }
Declared In
LazyMapCollection
, LazyCollectionType
, CollectionType
Returns the range of valid index values.
The result's endIndex is the same as that of self. Because
Range is half-open, iterating the values of the result produces
all valid subscript arguments for self, omitting its endIndex.
Declaration
var indices: Range<Base.Index> { get }
Declared In
LazyCollectionType
, CollectionType
Returns true iff self is empty.
Declaration
var isEmpty: Bool { get }
Declared In
LazyMapCollection
, LazyCollectionType
, CollectionType
Identical to self.
Declaration
var lazy: LazyMapCollection<Base, Element> { get }
Declared In
LazyCollectionType
, LazySequenceType
Subscripts
Access the element at position.
Requires: position is a valid position in self and
position != endIndex.
Declaration
subscript(position: Base.Index) -> Element { get }
Returns a collection representing a contiguous sub-range of
self's elements.
Complexity: O(1)
Declaration
subscript(bounds: Range<Base.Index>) -> Slice<LazyMapCollection<Base, Element>> { get }
Declared In
LazyCollectionType, CollectionType
Instance Methods
Returns true iff an element in self satisfies predicate.
Declaration
func contains(@noescape predicate: (Element) throws -> Bool) rethrows -> Bool
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns a subsequence containing all but the first element.
Complexity: O(1)
Declaration
func dropFirst() -> Slice<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns a subsequence containing all but the first n elements.
Requires: n >= 0
Complexity: O(n)
Declaration
func dropFirst(n: Int) -> Slice<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns a subsequence containing all but the last element.
Requires: self is a finite sequence.
Complexity: O(self.count)
Declaration
func dropLast() -> Slice<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns a subsequence containing all but the last n elements.
Requires: n >= 0
Complexity: O(self.count)
Declaration
func dropLast(n: Int) -> Slice<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns true iff self and other contain equivalent elements, using
isEquivalent as the equivalence test.
Requires: isEquivalent is an
equivalence relation.
Declaration
func elementsEqual<OtherSequence : SequenceType where OtherSequence.Generator.Element == Generator.Element>(other: OtherSequence, @noescape isEquivalent: (Element, Element) throws -> Bool) rethrows -> Bool
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns a lazy SequenceType containing pairs (n, x), where
ns are consecutive Ints starting at zero, and xs are
the elements of base:
> for (n, c) in "Swift".characters.enumerate() {
print("\(n): '\(c)'")
}
0: 'S'
1: 'w'
2: 'i'
3: 'f'
4: 't'Declaration
func enumerate() -> EnumerateSequence<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns the elements of self that satisfy predicate.
Note: The elements of the result are computed on-demand, as
the result is used. No buffering storage is allocated and each
traversal step invokes predicate on one or more underlying
elements.
Declaration
func filter(predicate: (Elements.Generator.Element) -> Bool) -> LazyFilterCollection<Elements>
Declared In
LazyCollectionType, CollectionType, LazySequenceType, SequenceType
Returns an Array containing the non-nil results of mapping
transform over self.
Complexity: O(M + N), where M is the length of self
and N is the length of the result.
Declaration
func flatMap<T>(@noescape transform: (Element) throws -> T?) rethrows -> [T]
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns an Array containing the concatenated results of mapping
transform over self.
s.flatMap(transform)is equivalent to
Array(s.map(transform).flatten())Complexity: O(M + N), where M is the length of self
and N is the length of the result.
Declaration
func flatMap<S : SequenceType>(transform: (Element) throws -> S) rethrows -> [S.Generator.Element]
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns the concatenated results of mapping transform over
self. Equivalent to
self.map(transform).flatten()Complexity: O(1)
Declaration
func flatMap<Intermediate : CollectionType>(transform: (Elements.Generator.Element) -> Intermediate) -> LazyCollection<FlattenCollection<LazyMapCollection<Elements, Intermediate>>>
Declared In
LazyCollectionType, LazySequenceType
Call body on each element in self in the same order as a
for-in loop.
sequence.forEach {
// body code
}is similar to:
for element in sequence {
// body code
}Note: You cannot use the break or continue statement to exit the
current call of the body closure or skip subsequent calls.
Note: Using the return statement in the body closure will only
exit from the current call to body, not any outer scope, and won't
skip subsequent calls.
Complexity: O(self.count)
Declaration
func forEach(@noescape body: (Element) throws -> Void) rethrows
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns a generator over the elements of this sequence.
Complexity: O(1).
Declaration
func generate() -> LazyMapGenerator<Base.Generator, Element>
Returns the first index where predicate returns true for the
corresponding value, or nil if such value is not found.
Complexity: O(self.count).
Declaration
func indexOf(@noescape predicate: (Element) throws -> Bool) rethrows -> Base.Index?
Declared In
LazyCollectionType, CollectionType
Returns true iff self precedes other in a lexicographical
("dictionary") ordering, using isOrderedBefore as the comparison
between elements.
Note: This method implements the mathematical notion of lexicographical
ordering, which has no connection to Unicode. If you are sorting strings
to present to the end-user, you should use String APIs that perform
localized comparison.
Requires: isOrderedBefore is a
strict weak ordering
over the elements of self and other.
Declaration
func lexicographicalCompare<OtherSequence : SequenceType where OtherSequence.Generator.Element == Generator.Element>(other: OtherSequence, @noescape isOrderedBefore: (Element, Element) throws -> Bool) rethrows -> Bool
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns a LazyMapCollection over this Collection. The elements of
the result are computed lazily, each time they are read, by
calling transform function on a base element.
Declaration
func map<U>(transform: (Elements.Generator.Element) -> U) -> LazyMapCollection<Elements, U>
Declared In
LazyCollectionType, CollectionType, LazySequenceType, SequenceType
Returns the maximum element in self or nil if the sequence is empty.
Complexity: O(elements.count).
Requires: isOrderedBefore is a
strict weak ordering
over self.
Declaration
func maxElement(@noescape isOrderedBefore: (Element, Element) throws -> Bool) rethrows -> Element?
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns the minimum element in self or nil if the sequence is empty.
Complexity: O(elements.count).
Requires: isOrderedBefore is a
strict weak ordering
over self.
Declaration
func minElement(@noescape isOrderedBefore: (Element, Element) throws -> Bool) rethrows -> Element?
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns a subsequence, up to maxLength in length, containing the
initial elements.
If maxLength exceeds self.count, the result contains all
the elements of self.
Requires: maxLength >= 0
Complexity: O(maxLength)
Declaration
func prefix(maxLength: Int) -> Slice<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns prefixUpTo(position.successor())
Complexity: O(1)
Declaration
func prefixThrough(position: Base.Index) -> Slice<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType
Returns self[startIndex..<end]
Complexity: O(1)
Declaration
func prefixUpTo(end: Base.Index) -> Slice<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType
Returns the result of repeatedly calling combine with an
accumulated value initialized to initial and each element of
self, in turn, i.e. return
combine(combine(...combine(combine(initial, self[0]),
self[1]),...self[count-2]), self[count-1]).
Declaration
func reduce<T>(initial: T, @noescape combine: (T, Element) throws -> T) rethrows -> T
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns an Array containing the elements of self in reverse
order.
Complexity: O(N), where N is the length of self.
Declaration
func reverse() -> [Element]
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns an Array containing the sorted elements of source
according to isOrderedBefore.
The sorting algorithm is not stable (can change the relative order of
elements for which isOrderedBefore does not establish an order).
Requires: isOrderedBefore is a
strict weak ordering
over the elements in self.
Declaration
func sort(@noescape isOrderedBefore: (Element, Element) -> Bool) -> [Element]
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns the maximal SubSequences of self, in order, that
don't contain elements satisfying the predicate isSeparator.
maxSplit: The maximum number of SubSequences to
return, minus 1.
If maxSplit + 1 SubSequences are returned, the last one is
a suffix of self containing the remaining elements.
The default value is Int.max.
allowEmptySubsequences: If true, an empty SubSequence
is produced in the result for each pair of consecutive elements
satisfying isSeparator.
The default value is false.
Requires: maxSplit >= 0
Declaration
func split(maxSplit: Int = default, allowEmptySlices: Bool = default, @noescape isSeparator: (Element) throws -> Bool) rethrows -> [Slice<LazyMapCollection<Base, Element>>]
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns true iff self begins with elements equivalent to those of
other, using isEquivalent as the equivalence test. Returns true if
other is empty.
Requires: isEquivalent is an
equivalence relation.
Declaration
func startsWith<OtherSequence : SequenceType where OtherSequence.Generator.Element == Generator.Element>(other: OtherSequence, @noescape isEquivalent: (Element, Element) throws -> Bool) rethrows -> Bool
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns a slice, up to maxLength in length, containing the
final elements of s.
If maxLength exceeds s.count, the result contains all
the elements of s.
Requires: maxLength >= 0
Complexity: O(self.count)
Declaration
func suffix(maxLength: Int) -> Slice<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns self[start..<endIndex]
Complexity: O(1)
Declaration
func suffixFrom(start: Base.Index) -> Slice<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType
Declaration
func underestimateCount() -> Int
Declared In
LazyMapCollection, LazyCollectionType, CollectionType, SequenceType
Conditionally Inherited Items
The initializers, methods, and properties listed below may be available on this type under certain conditions (such as methods that are available on Array when its elements are Equatable) or may not ever be available if that determination is beyond SwiftDoc.org's capabilities. Please open an issue on GitHub if you see something out of place!
Where Elements == Self
Identical to self.
Declaration
var elements: LazyMapCollection<Base, Element> { get }
Declared In
LazyCollectionType
, LazySequenceType
Where Elements.Generator.Element == Generator.Element, Generator.Element : SequenceType
A concatenation of the elements of self.
Declaration
func flatten() -> LazySequence<FlattenSequence<Elements>>
Declared In
LazyCollectionType, LazySequenceType
Where Elements.Index : BidirectionalIndexType
Returns the concatenated results of mapping transform over
self. Equivalent to
self.map(transform).flatten()Complexity: O(1)
Declaration
func flatMap<Intermediate : CollectionType where Intermediate.Index : BidirectionalIndexType>(transform: (Elements.Generator.Element) -> Intermediate) -> LazyCollection<FlattenBidirectionalCollection<LazyMapCollection<Elements, Intermediate>>>
Declared In
LazyCollectionType
Where Generator.Element : CollectionType
A concatenation of the elements of self.
Declaration
func flatten() -> FlattenCollection<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType
Where Generator.Element : CollectionType, Elements.Generator.Element : CollectionType, Generator.Element == Elements.Generator.Element
A concatenation of the elements of self.
Declaration
func flatten() -> LazyCollection<FlattenCollection<Elements>>
Declared In
LazyCollectionType
Where Generator.Element : CollectionType, Index : BidirectionalIndexType, Generator.Element.Index : BidirectionalIndexType
A concatenation of the elements of self.
Declaration
func flatten() -> FlattenBidirectionalCollection<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType
Where Generator.Element : CollectionType, Index : BidirectionalIndexType, Generator.Element.Index : BidirectionalIndexType, Elements.Generator.Element : CollectionType, Elements.Index : BidirectionalIndexType, Elements.Generator.Element.Index : BidirectionalIndexType, Generator.Element == Elements.Generator.Element
A concatenation of the elements of self.
Declaration
func flatten() -> LazyCollection<FlattenBidirectionalCollection<Elements>>
Declared In
LazyCollectionType
Where Generator.Element : Comparable
Returns true iff self precedes other in a lexicographical
("dictionary") ordering, using "<" as the comparison between elements.
Note: This method implements the mathematical notion of lexicographical
ordering, which has no connection to Unicode. If you are sorting strings
to present to the end-user, you should use String APIs that perform
localized comparison.
Declaration
func lexicographicalCompare<OtherSequence : SequenceType where OtherSequence.Generator.Element == Generator.Element>(other: OtherSequence) -> Bool
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns the maximum element in self or nil if the sequence is empty.
Complexity: O(elements.count).
Declaration
func maxElement() -> Element?
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns the minimum element in self or nil if the sequence is empty.
Complexity: O(elements.count).
Declaration
func minElement() -> Element?
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns an Array containing the sorted elements of source.
The sorting algorithm is not stable (can change the relative order of elements that compare equal).
Requires: The less-than operator (func <) defined in
the Comparable conformance is a
strict weak ordering
over the elements in self.
Declaration
func sort() -> [Element]
Declared In
LazyCollectionType, CollectionType, SequenceType
Where Generator.Element : Equatable
Returns true iff element is in self.
Declaration
func contains(element: Element) -> Bool
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns true iff self and other contain the same elements in the
same order.
Declaration
func elementsEqual<OtherSequence : SequenceType where OtherSequence.Generator.Element == Generator.Element>(other: OtherSequence) -> Bool
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns the first index where value appears in self or nil if
value is not found.
Complexity: O(self.count).
Declaration
func indexOf(element: Element) -> Base.Index?
Declared In
LazyCollectionType, CollectionType
Returns the maximal SubSequences of self, in order, around a
separator element.
maxSplit: The maximum number of SubSequences to
return, minus 1.
If maxSplit + 1 SubSequences are returned, the last one is
a suffix of self containing the remaining elements.
The default value is Int.max.
allowEmptySubsequences: If true, an empty SubSequence
is produced in the result for each pair of consecutive elements
satisfying isSeparator.
The default value is false.
Requires: maxSplit >= 0
Declaration
func split(separator: Element, maxSplit: Int = default, allowEmptySlices: Bool = default) -> [Slice<LazyMapCollection<Base, Element>>]
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns true iff the initial elements of self are equal to prefix.
Returns true if other is empty.
Declaration
func startsWith<OtherSequence : SequenceType where OtherSequence.Generator.Element == Generator.Element>(other: OtherSequence) -> Bool
Declared In
LazyCollectionType, CollectionType, SequenceType
Where Generator.Element : SequenceType
A concatenation of the elements of self.
Declaration
func flatten() -> FlattenSequence<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType, SequenceType
Returns a view, whose elements are the result of interposing a given
separator between the elements of the sequence self.
For example,
[[1, 2, 3], [4, 5, 6], [7, 8, 9]].joinWithSeparator([-1, -2])
yields [1, 2, 3, -1, -2, 4, 5, 6, -1, -2, 7, 8, 9].
Declaration
func joinWithSeparator<Separator : SequenceType where Separator.Generator.Element == Generator.Element.Generator.Element>(separator: Separator) -> JoinSequence<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType, SequenceType
Where Generator.Element == String
Interpose the separator between elements of self, then concatenate
the result. For example:
["foo", "bar", "baz"].joinWithSeparator("-|-") // "foo-|-bar-|-baz"Declaration
func joinWithSeparator(separator: String) -> String
Declared In
LazyCollectionType, CollectionType, SequenceType
Where Index : BidirectionalIndexType
Returns a subsequence containing all but the last n elements.
Requires: n >= 0
Complexity: O(n)
Declaration
func dropLast(n: Int) -> Slice<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType
Returns the elements of self in reverse order.
Complexity: O(1)
Declaration
func reverse() -> ReverseCollection<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType
Returns a slice, up to maxLength in length, containing the
final elements of s.
If maxLength exceeds s.count, the result contains all
the elements of s.
Requires: maxLength >= 0
Complexity: O(maxLength)
Declaration
func suffix(maxLength: Int) -> Slice<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType
Where Index : BidirectionalIndexType, Elements.Index : BidirectionalIndexType
Returns the elements of self in reverse order.
Complexity: O(1)
Declaration
func reverse() -> LazyCollection<ReverseCollection<Elements>>
Declared In
LazyCollectionType
Where Index : RandomAccessIndexType
Returns the elements of self in reverse order.
Complexity: O(1)
Declaration
func reverse() -> ReverseRandomAccessCollection<LazyMapCollection<Base, Element>>
Declared In
LazyCollectionType, CollectionType
Where Index : RandomAccessIndexType, Elements.Index : RandomAccessIndexType
Returns the elements of self in reverse order.
Complexity: O(1)
Declaration
func reverse() -> LazyCollection<ReverseRandomAccessCollection<Elements>>
Declared In
LazyCollectionType
A
CollectionTypewhose elements consist of those in aBaseCollectionTypepassed through a transform function returningElement. These elements are computed lazily, each time they're read, by calling the transform function on a base element.