How NSSet is different from NSArray?
How NSSet is different from NSArray?
An NSSet is much like an NSArray, the only difference is that the objects it holds are not ordered. So when you retrieve them they may come back in any random order, based on how easy it is for the system to retrieve them.
Which is faster NSArray or 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. Lesson: if you only need to iterate contents, don’t use an NSSet. Even if you need both iteration and inclusion testing, you should probably still choose an NSSet.
What is difference between NSArray and NSMutableArray?
The primary difference between NSArray and NSMutableArray is that a mutable array can be changed/modified after it has been allocated and initialized, whereas an immutable array, NSArray , cannot. This syntax creates an instance of an array for us.
What is NSDictionary?
The NSDictionary class declares the programmatic interface to objects that manage immutable associations of keys and values. Each entry consists of one object that represents the key and a second object that is that key’s value. Within a dictionary, the keys are unique.
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. macOS 10.0+
What is NSSet?
An object representing a static, unordered, uniquing collection, for use instead of a Set constant in cases that require reference semantics.
What is NSArray?
NSArray is Objective-C’s general-purpose array type. It represents an ordered collection of objects. NSArray is immutable, so we cannot dynamically add or remove items. Its mutable counterpart, NSMutableArray, will be discussed in the second part of this tutorial.
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?
NSMutableDictionary isn’t designed to be thread-safe data structure, and simply marking the property as atomic , doesn’t ensure that the underlying data operations are actually performed atomically (in a safe manner).