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 difference between array and NSArray in Swift?
Array is a struct, therefore it is a value type in Swift. NSArray is an immutable Objective C class, therefore it is a reference type in Swift and it is bridged to Array . NSMutableArray is the mutable subclass of NSArray . Because foo changes the local value of a and bar changes the reference.
What is NSMutableArray Swift?
Overview. The NSMutableArray class declares the programmatic interface to objects that manage a modifiable array of objects. This class adds insertion and deletion operations to the basic array-handling behavior inherited from NSArray .
What is difference between any and AnyObject in Swift?
Any and AnyObject are two special types in Swift that are used for working with non-specific types. According to Apple’s Swift documentation, Any can represent an instance of any type at all, including function types and optional types. AnyObject can represent an instance of any class type.
Is NSMutableArray thread safe?
In general, the collection classes (for example, NSMutableArray , NSMutableDictionary ) are not thread-safe when mutations are concerned. That is, if one or more threads are changing the same array, problems can occur.
What is difference between string and NSString in Swift?
NSString : Creates objects that resides in heap and always passed by reference. String: Its a value type whenever we pass it , its passed by value. like Struct and Enum, String itself a Struct in Swift. But copy is not created when you pass.
Can we use NSArray in Swift?
In Swift, the NSArray class conforms to the ArrayLiteralConvertible protocol, which allows it to be initialized with array literals. For more information about object literals in Swift, see Literal Expression in The Swift Programming Language (Swift 4.1).
Can any be nil Swift?
none . So theoretically, you should be able to assign nil to a variable declared as Any . Still, the compiler doesn’t allow this.
What is subscript method?
Classes, structures, and enumerations can define subscripts, which are shortcuts for accessing the member elements of a collection, list, or sequence. You use subscripts to set and retrieve values by index without needing separate methods for setting and retrieval.
