Foundation Collections by Kevin Conner

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Foundation Collections Kevin Conner @connerk

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You know these • NSArray • NSDictionary • NSRange • NSNull

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New syntax • array[i] • dictionary[k] • @[larry, moe, curly] • @{ key: value, foo: bar } • @3, @YES, @(array.count - 1)

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Let’s talk about sets baby

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NSSet • -addObject: • -removeObject: • -containsObject: • -anyObject

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NSIndexSet • -addIndex: • -removeIndex: • -containsIndex: • -enumerateIndexesUsingBlock: • -enumerateRangesUsingBlock: • -countOfIndexesInRange: (et al)

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Sets can be indexes for other collections • NSSet : NSDictionary :: NSIndexSet : NSArray • [dictionary keySet] • [NSIndexSet indexSetWithRange: • NSMakeRange(0, array.count)]

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NSSet theory • -intersectsSet: • -isSubsetOfSet: • -unionSet: • -minusSet: • -intersectSet:

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NSIndexSet theory • -containsIndexes: • -enumerateRangesUsingBlock: • -intersectsIndexesInRange: • -addIndexesInRange: • -removeIndexesInRange:

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NSCountedSet • -addObject: • -removeObject: • -countForObject: • -initWithArray:

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"An object can be put into the same pool several times, in which case it receives a release message for each time it was put into the pool."

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Let’s talk about ordered collections baby

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NSArray and NSOrderedSet • -objectAtIndex: • -indexOfObject: • -insertObject:atIndex: • -removeObjectAtIndex: • -exchangeObjectAtIndex:withObjectAtIndex:

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Ordered collections and NSIndexSet • -objectsAtIndexes: • -insertObjects:atIndexes: • -removeObjectsAtIndexes: • -moveObjectsAtIndexes:toIndex: • -shiftIndexesStartingAtIndex:by:

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Searching • -indexOfObject: • -indexOfObjectPassingTest: • -indexOfObjectAtIndexes:options:passingTest: • -indexOfObject:inSortedRange:objects:usingComparator:

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Filtering • -objectsPassingTest: • -keysOfEntriesPassingTest: • -indexesPassingTest: • -indexesOfObjectsPassingTest: • -indexesOfObjectsAtIndexes:options:passingTest:

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intermission

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Making sets from other collections • +orderedSetWithSet: • +orderedSetWithArray: • +setWithArray • [orderedSet set]

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Making arrays from sets • [orderedSet array] • -sortedArrayUsingDescriptors:

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NSSortDescriptor • +sortDescriptorWithKey:ascending: • +sortDescriptorWithKey:ascending:selector: • +sortDescriptorWithKey:ascending:comparator:

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Invocation • -makeObjectsPerformSelector: • -makeObjectsPerformSelectorWithObject: