Which is faster to iterate through an NSArray or an NSSet?
Yes, NSArray is faster than NSSet for simply holding and iterating. As little as 50% faster for constructing and as much as 500% faster for iterating.
What is NSPointerArray?
The NSPointerArray class is a sparse array that works similar to an NSMutableArray , but can also hold NULL values, and the count method will reflect those empty spots. Alternatively, using addPointer: will automatically increase array size if needed.
Is Swift set ordered?
3 Answers. Swift does not have a native ordered set type. If you use Foundation , you can use NSOrderedSet in Swift. If not, you have the opportunity to write your own ordered set data structure.
How do I iterate through a set in Swift?
Iterating Over a Set Swift’s Set type doesn’t have a defined ordering. To iterate over the values of a set in a specific order, use the sorted() method, which returns the set’s elements as an array sorted using the < operator.
What is set in Swift?
Swift 4 sets are used to store distinct values of same types but they don’t have definite ordering as arrays have. You can use sets instead of arrays if ordering of elements is not an issue, or if you want to ensure that there are no duplicate values. (sets allow only distinct values.)
Is NSCache thread safe?
One more thing about NSCache is, it is thread safe. We can access it from any thread without worrying about managing threads while accessing NSCache. You can set & get name for cache. NSCache handles caching & evict of objects for you automatically.
Is NSDictionary thread safe?
In general, the collection classes (for example, NSMutableArray , NSMutableDictionary ) are not thread-safe when mutations are concerned.
Are Dicts mutable Python?
A dictionary is an unordered and mutable Python container that stores mappings of unique keys to values. Dictionaries are written with curly brackets ({}), including key-value pairs separated by commas (,).
What is difference between array and set in Swift?
Swift provides three primary collection types, known as arrays, sets, and dictionaries, for storing collections of values. Arrays are ordered collections of values. Sets are unordered collections of unique values. It also means you can be confident about the type of values you will retrieve from a collection.