Structure

DispatchDataIterator

A byte-by-byte iterator over the contents of a dispatch data object.

Declaration

struct DispatchDataIterator

Topics

Creating the Iterator

func makeIterator() -> DispatchDataIterator

Returns an iterator over the elements of this sequence.

Getting the Number of Elements

var underestimatedCount: Int

A value less than or equal to the number of elements in the sequence, calculated nondestructively.

Finding Elements

func contains(UInt8) -> Bool

Returns a Boolean value indicating whether the sequence contains the given element.

func contains(where: (UInt8) -> Bool) -> Bool

Returns a Boolean value indicating whether the sequence contains an element that satisfies the given predicate.

func first(where: (UInt8) -> Bool) -> UInt8?

Returns the first element of the sequence that satisfies the given predicate.

func max() -> UInt8?

Returns the maximum element in the sequence.

func max(by: (UInt8, UInt8) -> Bool) -> UInt8?

Returns the maximum element in the sequence, using the given predicate as the comparison between elements.

func min() -> UInt8?

Returns the minimum element in the sequence.

func min(by: (UInt8, UInt8) -> Bool) -> UInt8?

Returns the minimum element in the sequence, using the given predicate as the comparison between elements.

Excluding Elements

func filter((UInt8) -> Bool) -> [UInt8]

Returns an array containing, in order, the elements of the sequence that satisfy the given predicate.

Transforming a Sequence

func compactMap<ElementOfResult>((UInt8) -> ElementOfResult?) -> [ElementOfResult]

Returns an array containing the non-nil results of calling the given transformation with each element of this sequence.

func flatMap<SegmentOfResult>((UInt8) -> SegmentOfResult) -> [SegmentOfResult.Element]

Returns an array containing the concatenated results of calling the given transformation with each element of this sequence.

func map<T>((UInt8) -> T) -> [T]

Returns an array containing the results of mapping the given closure over the sequence’s elements.

func reduce<Result>(Result, (Result, UInt8) -> Result) -> Result

Returns the result of combining the elements of the sequence using the given closure.

var lazy: LazySequence<DispatchDataIterator>

A sequence containing the same elements as this sequence, but on which some operations, such as map and filter, are implemented lazily.

Iterating Over a Sequence's Elements

func enumerated() -> EnumeratedSequence<DispatchDataIterator>

Returns a sequence of pairs (n, x), where n represents a consecutive integer starting at zero and x represents an element of the sequence.

func forEach((UInt8) -> Void)

Calls the given closure on each element in the sequence in the same order as a for-in loop.

Sorting Elements

func reversed() -> [UInt8]

Returns an array containing the elements of this sequence in reverse order.

func sorted() -> [UInt8]

Returns the elements of the sequence, sorted.

func sorted(by: (UInt8, UInt8) -> Bool) -> [UInt8]

Returns the elements of the sequence, sorted using the given predicate as the comparison between elements.

func shuffled() -> [UInt8]

Returns the elements of the sequence, shuffled.

func shuffled<T>(using: inout T) -> [UInt8]

Returns the elements of the sequence, shuffled using the given generator as a source for randomness.

Comparing Sequences

func allSatisfy((UInt8) -> Bool) -> Bool

Returns a Boolean value indicating whether every element of a sequence satisfies a given predicate.

func elementsEqual<OtherSequence>(OtherSequence) -> Bool

Returns a Boolean value indicating whether this sequence and another sequence contain the same elements in the same order.

func elementsEqual<OtherSequence>(OtherSequence, by: (UInt8, OtherSequence.Element) -> Bool) -> Bool

Returns a Boolean value indicating whether this sequence and another sequence contain equivalent elements in the same order, using the given predicate as the equivalence test.

func lexicographicallyPrecedes<OtherSequence>(OtherSequence) -> Bool

Returns a Boolean value indicating whether the sequence precedes another sequence in a lexicographical (dictionary) ordering, using the less-than operator (<) to compare elements.

func lexicographicallyPrecedes<OtherSequence>(OtherSequence, by: (UInt8, UInt8) -> Bool) -> Bool

Returns a Boolean value indicating whether the sequence precedes another sequence in a lexicographical (dictionary) ordering, using the given predicate to compare elements.

func starts<PossiblePrefix>(with: PossiblePrefix) -> Bool

Returns a Boolean value indicating whether the initial elements of the sequence are the same as the elements in another sequence.

func starts<PossiblePrefix>(with: PossiblePrefix, by: (UInt8, PossiblePrefix.Element) -> Bool) -> Bool

Returns a Boolean value indicating whether the initial elements of the sequence are equivalent to the elements in another sequence, using the given predicate as the equivalence test.

Deprecated

func flatMap<ElementOfResult>((UInt8) -> ElementOfResult?) -> [ElementOfResult]

Returns an array containing the non-nil results of calling the given transformation with each element of this sequence.

Deprecated

Instance Methods

func drop(while: (UInt8) -> Bool) -> DropWhileSequence<DispatchDataIterator>

Returns a sequence by skipping the initial, consecutive elements that satisfy the given predicate.

func dropFirst(Int) -> DropFirstSequence<DispatchDataIterator>

Returns a sequence containing all but the given number of initial elements.

func dropLast(Int) -> [UInt8]

Returns a sequence containing all but the given number of final elements.

func prefix(Int) -> PrefixSequence<DispatchDataIterator>

Returns a sequence, up to the specified maximum length, containing the initial elements of the sequence.

func prefix(while: (UInt8) -> Bool) -> [UInt8]

Returns a sequence containing the initial, consecutive elements that satisfy the given predicate.

func reduce<Result>(into: Result, (inout Result, UInt8) -> ()) -> Result

Returns the result of combining the elements of the sequence using the given closure.

func split(maxSplits: Int, omittingEmptySubsequences: Bool, whereSeparator: (UInt8) -> Bool) -> [ArraySlice<UInt8>]

Returns the longest possible subsequences of the sequence, in order, that don’t contain elements satisfying the given predicate. Elements that are used to split the sequence are not returned as part of any subsequence.

func split(separator: UInt8, maxSplits: Int, omittingEmptySubsequences: Bool) -> [ArraySlice<UInt8>]

Returns the longest possible subsequences of the sequence, in order, around elements equal to the given element.

func suffix(Int) -> [UInt8]

Returns a subsequence, up to the given maximum length, containing the final elements of the sequence.

Relationships

See Also

System Event Monitoring

class DispatchSource

An object that coordinates the processing of specific low-level system events, such as file-system events, timers, and UNIX signals.

class DispatchIO

An object that manages operations on a file descriptor using either stream-based or random-access semantics.

struct DispatchData

An object that manages a memory-based data buffer and exposes it as a contiguous block of memory.