struct String.UnicodeScalarView| Inheritance |
CollectionType, CustomDebugStringConvertible, CustomStringConvertible, Indexable, RangeReplaceableCollectionType, SequenceType, _Reflectable
View Protocol Hierarchy →
|
|---|---|
| Associated Types | |
| Nested Types | String.UnicodeScalarView.Index, String.UnicodeScalarView.Generator |
| Import | import Swift |
Initializers
Creates a collection instance that contains elements.
Declaration
init<S : SequenceType where S.Generator.Element == Generator.Element>(_ elements: S)
Declared In
RangeReplaceableCollectionType
Instance Variables
Returns the number of elements.
Complexity: O(1) if Index conforms to RandomAccessIndexType;
O(N) otherwise.
Declaration
var count: String.UnicodeScalarView.Index.Distance { get }
Declared In
RangeReplaceableCollectionType
, CollectionType
The "past the end" position.
endIndex is not a valid argument to subscript, and is always
reachable from startIndex by zero or more applications of
successor().
Declaration
var endIndex: String.UnicodeScalarView.Index { get }
Returns the first element of self, or nil if self is empty.
Complexity: O(1)
Declaration
var first: UnicodeScalar? { get }
Declared In
RangeReplaceableCollectionType
, 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<String.UnicodeScalarView.Index> { get }
Declared In
RangeReplaceableCollectionType
, CollectionType
Returns true iff self is empty.
Complexity: O(1)
Declaration
var isEmpty: Bool { get }
Declared In
RangeReplaceableCollectionType
, CollectionType
Declaration
var last: UnicodeScalar? { get }
Declared In
RangeReplaceableCollectionType
, CollectionType
A collection with contents identical to self, but on which
normally-eager operations such as map and filter are
implemented lazily.
See Also: LazySequenceType, LazyCollectionType.
Declaration
var lazy: LazyCollection<String.UnicodeScalarView> { get }
Declared In
RangeReplaceableCollectionType
, CollectionType
The position of the first UnicodeScalar if the String is
non-empty; identical to endIndex otherwise.
Declaration
var startIndex: String.UnicodeScalarView.Index { get }
Subscripts
Access the elements delimited by the given half-open range of indices.
Complexity: O(1) unless bridging from Objective-C requires an O(N) conversion.
Declaration
subscript(r: Range<String.UnicodeScalarView.Index>) -> String.UnicodeScalarView { get }
Access the element at position.
Requires: position is a valid position in self and
position != endIndex.
Declaration
subscript(position: String.UnicodeScalarView.Index) -> UnicodeScalar { get }
Instance Methods
Append x to self.
Complexity: Amortized O(1).
Declaration
mutating func append(x: UnicodeScalar)
Declared In
String.UnicodeScalarView, RangeReplaceableCollectionType
Append the elements of newElements to self.
Complexity: O(length of result).
Declaration
mutating func appendContentsOf<S : SequenceType where S.Generator.Element == UnicodeScalar>(newElements: S)
Declared In
String.UnicodeScalarView, RangeReplaceableCollectionType
Returns true iff an element in self satisfies predicate.
Declaration
func contains(@noescape predicate: (UnicodeScalar) throws -> Bool) rethrows -> Bool
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
Returns a subsequence containing all but the first element.
Complexity: O(1)
Declaration
func dropFirst() -> String.UnicodeScalarView
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
Returns a subsequence containing all but the first n elements.
Requires: n >= 0
Complexity: O(n)
Declaration
func dropFirst(n: Int) -> String.UnicodeScalarView
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
Returns a subsequence containing all but the last element.
Requires: self is a finite sequence.
Complexity: O(self.count)
Declaration
func dropLast() -> String.UnicodeScalarView
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
Returns a subsequence containing all but the last n elements.
Requires: n >= 0
Complexity: O(self.count)
Declaration
func dropLast(n: Int) -> String.UnicodeScalarView
Declared In
RangeReplaceableCollectionType, 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
RangeReplaceableCollectionType, 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: (UnicodeScalar, UnicodeScalar) throws -> Bool) rethrows -> Bool
Declared In
RangeReplaceableCollectionType, 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<String.UnicodeScalarView>
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
Returns an Array containing the elements of self,
in order, that satisfy the predicate includeElement.
Declaration
func filter(@noescape includeElement: (UnicodeScalar) throws -> Bool) rethrows -> [UnicodeScalar]
Declared In
RangeReplaceableCollectionType, CollectionType, 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: (UnicodeScalar) throws -> T?) rethrows -> [T]
Declared In
RangeReplaceableCollectionType, 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: (UnicodeScalar) throws -> S) rethrows -> [S.Generator.Element]
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
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: (UnicodeScalar) throws -> Void) rethrows
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
Returns a generator over the UnicodeScalars that comprise
this sequence.
Complexity: O(1).
Declaration
func generate() -> String.UnicodeScalarView.Generator
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: (UnicodeScalar) throws -> Bool) rethrows -> String.UnicodeScalarView.Index?
Declared In
RangeReplaceableCollectionType, CollectionType
Insert newElement at index i.
Invalidates all indices with respect to self.
Complexity: O(self.count).
Declaration
mutating func insert(newElement: UnicodeScalar, atIndex i: String.UnicodeScalarView.Index)
Declared In
RangeReplaceableCollectionType
Insert newElements at index i.
Invalidates all indices with respect to self.
Complexity: O(self.count + newElements.count).
Declaration
mutating func insertContentsOf<C : CollectionType where C.Generator.Element == Generator.Element>(newElements: C, at i: String.UnicodeScalarView.Index)
Declared In
RangeReplaceableCollectionType
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
RangeReplaceableCollectionType, CollectionType, SequenceType
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: (UnicodeScalar, UnicodeScalar) throws -> Bool) rethrows -> Bool
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
Returns an Array containing the results of mapping transform
over self.
Complexity: O(N).
Declaration
func map<T>(@noescape transform: (UnicodeScalar) throws -> T) rethrows -> [T]
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
Returns the maximum element in self or nil if the sequence is empty.
Complexity: O(elements.count).
Declaration
func maxElement() -> UnicodeScalar?
Declared In
RangeReplaceableCollectionType, CollectionType, 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: (UnicodeScalar, UnicodeScalar) throws -> Bool) rethrows -> UnicodeScalar?
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
Returns the minimum element in self or nil if the sequence is empty.
Complexity: O(elements.count).
Declaration
func minElement() -> UnicodeScalar?
Declared In
RangeReplaceableCollectionType, 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: (UnicodeScalar, UnicodeScalar) throws -> Bool) rethrows -> UnicodeScalar?
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
If !self.isEmpty, remove the first element and return it, otherwise
return nil.
Complexity: O(1)
Declaration
mutating func popFirst() -> UnicodeScalar?
Declared In
RangeReplaceableCollectionType, CollectionType
If !self.isEmpty, remove the last element and return it, otherwise
return nil.
Complexity: O(self.count)
Deprecated: it will be removed in Swift 3.
Declaration
mutating func popLast() -> UnicodeScalar?
Declared In
RangeReplaceableCollectionType, CollectionType
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) -> String.UnicodeScalarView
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
Returns prefixUpTo(position.successor())
Complexity: O(1)
Declaration
func prefixThrough(position: String.UnicodeScalarView.Index) -> String.UnicodeScalarView
Declared In
RangeReplaceableCollectionType, CollectionType
Returns self[startIndex..<end]
Complexity: O(1)
Declaration
func prefixUpTo(end: String.UnicodeScalarView.Index) -> String.UnicodeScalarView
Declared In
RangeReplaceableCollectionType, 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, UnicodeScalar) throws -> T) rethrows -> T
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
Remove all elements.
Invalidates all indices with respect to self.
keepCapacity: If true, is a non-binding request to
avoid releasing storage, which can be a useful optimization
when self is going to be grown again.
Complexity: O(self.count).
Declaration
mutating func removeAll(keepCapacity keepCapacity: Bool = default)
Declared In
RangeReplaceableCollectionType
Remove the element at index i.
Invalidates all indices with respect to self.
Complexity: O(self.count).
Declaration
mutating func removeAtIndex(index: String.UnicodeScalarView.Index) -> UnicodeScalar
Declared In
RangeReplaceableCollectionType
Remove the element at startIndex and return it.
Complexity: O(self.count)
Requires: !self.isEmpty.
Declaration
mutating func removeFirst() -> UnicodeScalar
Declared In
RangeReplaceableCollectionType, CollectionType
Remove the first n elements.
Complexity: O(self.count)
Requires: n >= 0 && self.count >= n.
Declaration
mutating func removeFirst(n: Int)
Declared In
RangeReplaceableCollectionType, CollectionType
Remove an element from the end.
Complexity: O(1)
Requires: !self.isEmpty
Declaration
mutating func removeLast() -> UnicodeScalar
Declared In
RangeReplaceableCollectionType, CollectionType
Remove the last n elements.
Complexity: O(self.count)
Requires: n >= 0 && self.count >= n.
Declaration
mutating func removeLast(n: Int)
Declared In
RangeReplaceableCollectionType, CollectionType
Remove the indicated subRange of elements.
Invalidates all indices with respect to self.
Complexity: O(self.count).
Declaration
mutating func removeRange(subRange: Range<String.UnicodeScalarView.Index>)
Declared In
RangeReplaceableCollectionType
Replace the given subRange of elements with newElements.
Invalidates all indices with respect to self.
Complexity: O(subRange.count) if subRange.endIndex
== self.endIndex and newElements.isEmpty, O(N) otherwise.
Declaration
mutating func replaceRange<C : CollectionType where C.Generator.Element == UnicodeScalar>(subRange: Range<String.UnicodeScalarView.Index>, with newElements: C)
Reserve enough space to store n ASCII characters.
Complexity: O(n).
Declaration
mutating func reserveCapacity(n: Int)
Declared In
String.UnicodeScalarView, RangeReplaceableCollectionType
Returns an Array containing the elements of self in reverse
order.
Complexity: O(N), where N is the length of self.
Declaration
func reverse() -> [UnicodeScalar]
Declared In
RangeReplaceableCollectionType, 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() -> [UnicodeScalar]
Declared In
RangeReplaceableCollectionType, 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: (UnicodeScalar, UnicodeScalar) -> Bool) -> [UnicodeScalar]
Declared In
RangeReplaceableCollectionType, 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: (UnicodeScalar) throws -> Bool) rethrows -> [String.UnicodeScalarView]
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
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: UnicodeScalar, maxSplit: Int = default, allowEmptySlices: Bool = default) -> [String.UnicodeScalarView]
Declared In
RangeReplaceableCollectionType, 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
RangeReplaceableCollectionType, 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: (UnicodeScalar, UnicodeScalar) throws -> Bool) rethrows -> Bool
Declared In
RangeReplaceableCollectionType, 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) -> String.UnicodeScalarView
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
Returns self[start..<endIndex]
Complexity: O(1)
Declaration
func suffixFrom(start: String.UnicodeScalarView.Index) -> String.UnicodeScalarView
Declared In
RangeReplaceableCollectionType, CollectionType
Returns a value less than or equal to the number of elements in
self, nondestructively.
Complexity: O(N).
Declaration
func underestimateCount() -> Int
Declared In
RangeReplaceableCollectionType, CollectionType, SequenceType
A collection of Unicode scalar values that encodes a
Stringvalue.