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Collections in Swift
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Nate Cook
March 31, 2016
Programming
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Collections in Swift
Talk at CocoaConf Chicago, March 2016
Nate Cook
March 31, 2016
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Transcript
Collections in Swift
Nate’s favorite part of Swift: The Standard Library Collections System
Protocol-oriented programming
Protocols in Objective-C
Protocols in Swift
Protocols of Swift collections
This session 1. The “Problem” 2. How Swift's collections work
3. New approaches
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! " #
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! " #
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This session 1. The “Problem” 2. How Swift's collections work
3. New approaches
None
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A sequence is a series of values we can access
one at a time » 6'2", 5'7", 5'9", 5'4", 5'11" » 0xEF 0xBB 0xBF 0x4E 0x61 0x74 0x65 » 22, 27, 4, 8, 28, 14, ... » 0, 1, 2, 3, 4, 5, 6, 7, ...
Sequences
SequenceType GeneratorType
SequenceType requirements func generate() -> Generator GeneratorType requirements func next()
-> Element?
One element at a time
let numbers = [1, 2, 3, 4] for num in
numbers { print(num) } ...is equivalent to: var gen = numbers.generate() while let num = gen.next() { print(num) }
Iteration » contains(_:) » minimumElement() / maximumElement() » map(_:) /
filter(_:) / reduce(_:combine:) » prefix(_:) / dropFirst(_:)
demo
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None
Collections provide indexed subscript access to their elements » Arrays
» String views (i.e., "Hi there".characters) » Sets » Dictionaries
CollectionType
CollectionType requirements var startIndex: Index var endIndex: Index subscript(i: Index)
-> Generator.Element
Quick diversion: Index types » Forward index types » Bidirectional
index types » Random-access index types
CollectionType requirements var startIndex: Index var endIndex: Index subscript(i: Index)
-> Generator.Element
Indexed access to elements » Collections are sequences, too »
prefixUpTo(_:), prefixThrough(_:), suffixFrom(_:) » subscript(Range<Index>) » count, isEmpty » indices
Sequenception
demo
None
None
Range-replaceable collections support arbitrary subrange replacement » Pretty much just
arrays
RangeReplaceableCollectionType requirements init() func replaceRange<C: CollectionType where C.Generator.Element == Generator.Element>
(subRange: Range<Index>, with newElements: C)
Mix-and-match » append(_:), appendContentsOf(_:) » insert(_:), insertContentsOf(_:) » removeAtIndex(_:), removeRange(_:)
» removeAll()
demo
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None
This session 1. The “Problem” 2. How Swift's collections work
3. New approaches
demo
SwiftDoc.org
None
Thank you! Nate Cook @nnnnnnnn