What is NSSortDescriptor?
An immutable description of how to order a collection of objects according to a property common to all the objects.
Is NSSet sorted?
An ‘NSSet’ is unordered. It is meant to contain only unique items (no duplicate items).
What is Nsfetchrequest in Swift?
A description of search criteria used to retrieve data from a persistent store. iOS 3.0+
How do I sort a list in Swift?
Strings in Swift conform to the Comparable protocol, so the names are sorted in ascending order according to the less-than operator ( < ). To sort the elements of your collection in descending order, pass the greater-than operator ( > ) to the sort(by:) method.
What is a difference between NSArray and NSSet?
The main difference is that NSArray is for an ordered collection and NSSet is for an unordered collection. If you’re iterating through an unordered collection, NSSet is great.
How do I use NSBatchDeleteRequest?
Setting up an NSBatchDeleteRequest is fairly simple. It requires either passing in an NSFetchRequest instance or a collection of managed object identifiers. After that, you simply execute the batch delete request on your managed object context.
What is NSEntityDescription in Swift?
An NSEntityDescription object is associated with a specific class whose instances are used to represent entries in a persistent store in applications using the Core Data Framework. Minimally, an entity description should have: A name. The name of a managed object class.
What is filter in Swift?
The filter function loops over every item in a collection, and returns a collection containing only items that satisfy an include condition. It’s like applying an if-statement to a collection, and only keeping the values that pass the condition.
What is the difference between sort and sorted in Swift?
4 Answers. sort mutates the array it is called on so its items are sorted. sorted returns a copy of the array it is called on with the values sorted. Also, if you have a giant array that contained value types and called sorted on it, it would duplicate each value and double the memory usage.
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 NSSet in Swift?
An object representing a static, unordered, uniquing collection, for use instead of a Set constant in cases that require reference semantics. Language. SwiftObjective-C.