What is an NSMutableArray?

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 . NSMutableArray is “toll-free bridged” with its Core Foundation counterpart, CFMutableArray .

What is the difference between array and NSArray?

4 Answers. 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 .

What is NSString?

An NSString object encodes a Unicode-compliant text string, represented as a sequence of UTF–16 code units. The objects you create using NSString and NSMutableString are referred to as string objects (or, when no confusion will result, merely as strings). The term C string refers to the standard char * type.

What is NSNumber in Objective-C?

NSNumber is a subclass of NSValue that offers a value as any C scalar (numeric) type. It defines a set of methods specifically for setting and accessing the value as a signed or unsigned char , short int , int , long int , long long int , float , or double or as a BOOL .

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 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.

What is the difference between NSString and string?

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.

What does NS mean in Swift?

NeXTSTEP
The Foundation Kit, or just Foundation for short, is an Objective-C framework in the OpenStep specification. It provides basic classes such as wrapper classes and data structure classes. This framework uses the prefix NS (for NeXTSTEP). It is also part of Cocoa and of the Swift standard library.

How do I create an NSDictionary in Objective-C?

Objective-C Language NSDictionary

1. Create# NSDictionary *dict = [[NSDictionary alloc] initWithObjectsAndKeys:@”value1″, @”key1″, @”value2″, @”key2″, nil];
2. NSDictionary to NSArray.
3. NSDictionary to NSData.
4. NSDictionary to JSON.
5. Block Based Enumeration.
6. Fast Enumeration.

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. 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.

How to create an NSArray object in Objective-C?

See Toll-Free Bridging for more information on toll-free bridging. In addition to the provided initializers, such as initWithObjects:, you can create an NSArray object using an array literal. In Objective-C, the compiler generates code that makes an underlying call to the init (objects:count:) method.

Which is an array object in Objective C?

NSArray and NSMutableArray are the Objective C array objects. In this tutorial we’ll discuss NSArray at a basic level along with various functions available in the class. NSArray help us in creating static array in Objective C programming.

What is nsmutablearray and what does NSArray do?

NSArray and its subclass NSMutableArray manage ordered collections of objects called arrays. NSArray creates static arrays, and NSMutableArray creates dynamic arrays. You can use arrays when you need an ordered collection of objects.

How to create a parametrized array in NSArray?

Returns a strongly-typed C# array of the parametrized type from a weakly typed NSArray. Returns a strongly-typed C# array of the parametrized type from a weakly typed NSArray. Creates an NSArray containing the elements in the specified array.