Table of Contents
What is 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 NSArray Objective-C?
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 Objective-C Quora?
Objective-C is the primary programming language you use when writing software for OS X and iOS. It’s a superset of the C programming language and provides object-oriented capabilities and a dynamic runtime.
How do I create an NSDictionary in Objective-C?
Objective-C Language NSDictionary
- Create# NSDictionary *dict = [[NSDictionary alloc] initWithObjectsAndKeys:@”value1″, @”key1″, @”value2″, @”key2″, nil];
- NSDictionary to NSArray.
- NSDictionary to NSData.
- NSDictionary to JSON.
- Block Based Enumeration.
- Fast Enumeration.
How do I add an object to NSArray?
you cannot add Objects at run time to NSArray. For adding or removing objects at Run time you have to use NSMutableArray.
What is NS mutable array?
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 NSDictionary and NSMutableDictionary?
Main Difference is: NSMutableDictionary is derived from NSDictionary, it has all the methods of NSDictionary. NSMutableDictionary is mutable( can be modified) but NSDictionary is immutable (can not be modified).
How do you declare an array of objects in Objective C?
Creating an Array Object The NSArray class contains a class method named arrayWithObjects that can be called upon to create a new array object and initialize it with elements. For example: NSArray *myColors; myColors = [NSArray arrayWithObjects: @”Red”, @”Green”, @”Blue”, @”Yellow”, nil];
What is an NSArray in Objective-C?
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 NSArray and nsmutablearray?
NSArray NSMutableArray. 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.
How to check if a given element exists in an NSArray?
Note: To check if a given element exists in the NSArray, containsObject: method is used with the string literal passed as the parameter. To retrieve the index of an NSArray element, indexOfObject: method is used. This either returns the index of the first occurrence of the requested object or NSNotFound if it’s not in the array.
How to initialize a newly allocated array?
Initializes a newly allocated array by placing in it the objects contained in a given array. Recommended use is [NSArray arrayWithArray:] instead of [ [NSArray alloc]initWithArray:] Initializes a newly allocated array using anArray as the source of data objects for the array. // Check if the two array objects refer to same objects. It shouldn’t.