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Merge pull request #872 from apollographql/add/extensions
Convenience extensions and reorganization
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| import Foundation | ||
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| // MARK: - Emptiness + Optionality | ||
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| extension Collection { | ||
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| /// Convenience helper to make `guard` statements more readable | ||
| /// | ||
| /// - returns: `true` if the collection has contents. | ||
| var isNotEmpty: Bool { | ||
| return !self.isEmpty | ||
| } | ||
| } | ||
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| extension Optional where Wrapped: Collection { | ||
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| /// - returns: `true` if the collection is empty or nil | ||
| var isEmptyOrNil: Bool { | ||
| switch self { | ||
| case .none: | ||
| return true | ||
| case .some(let collection): | ||
| return collection.isEmpty | ||
| } | ||
| } | ||
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| /// - returns: `true` if the collection is non-nil AND has contents. | ||
| var isNotEmpty: Bool { | ||
| switch self { | ||
| case .none: | ||
| return false | ||
| case .some(let collection): | ||
| return collection.isNotEmpty | ||
| } | ||
| } | ||
| } | ||
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| // MARK: - Unzipping | ||
| // MARK: Arrays of tuples to tuples of arrays | ||
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| public func unzip<Element1, Element2>(_ array: [(Element1, Element2)]) -> ([Element1], [Element2]) { | ||
| var array1: [Element1] = [] | ||
| var array2: [Element2] = [] | ||
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| for element in array { | ||
| array1.append(element.0) | ||
| array2.append(element.1) | ||
| } | ||
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| return (array1, array2) | ||
| } | ||
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| public func unzip<Element1, Element2, Element3>(_ array: [(Element1, Element2, Element3)]) -> ([Element1], [Element2], [Element3]) { | ||
| var array1: [Element1] = [] | ||
| var array2: [Element2] = [] | ||
| var array3: [Element3] = [] | ||
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| for element in array { | ||
| array1.append(element.0) | ||
| array2.append(element.1) | ||
| array3.append(element.2) | ||
| } | ||
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| return (array1, array2, array3) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| public extension Dictionary { | ||
| static func += (lhs: inout Dictionary, rhs: Dictionary) { | ||
| lhs.merge(rhs) { (_, new) in new } | ||
| } | ||
| } | ||
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| extension Dictionary { | ||
| init<S: Sequence>(_ entries: S) where S.Iterator.Element == Element { | ||
| self = Dictionary(minimumCapacity: entries.underestimatedCount) | ||
| for (key, value) in entries { | ||
| self[key] = value | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| struct GroupedSequence<Key: Equatable, Value> { | ||
| private(set) var keys: [Key] = [] | ||
| fileprivate var groupsForKeys: [[Value]] = [] | ||
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| mutating func append(value: Value, forKey key: Key) -> (Int, Int) { | ||
| if let index = keys.firstIndex(where: { $0 == key }) { | ||
| groupsForKeys[index].append(value) | ||
| return (index, groupsForKeys[index].endIndex - 1) | ||
| } else { | ||
| keys.append(key) | ||
| groupsForKeys.append([value]) | ||
| return (keys.endIndex - 1, 0) | ||
| } | ||
| } | ||
| } | ||
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| extension GroupedSequence: Sequence { | ||
| func makeIterator() -> GroupedSequenceIterator<Key, Value> { | ||
| return GroupedSequenceIterator(base: self) | ||
| } | ||
| } | ||
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| struct GroupedSequenceIterator<Key: Equatable, Value>: IteratorProtocol { | ||
| private var base: GroupedSequence<Key, Value> | ||
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| private var keyIterator: EnumeratedSequence<Array<Key>>.Iterator | ||
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| init(base: GroupedSequence<Key, Value>) { | ||
| self.base = base | ||
| keyIterator = base.keys.enumerated().makeIterator() | ||
| } | ||
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| mutating func next() -> (Key, [Value])? { | ||
| if let (index, key) = keyIterator.next() { | ||
| let values = base.groupsForKeys[index] | ||
| return (key, values) | ||
| } else { | ||
| return nil | ||
| } | ||
| } | ||
| } |
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