What is NSArray class?
How does initialize a newly allocated array work?
What does forkey return?
What does return array containing?
What does return array do?
What does a comparator return?
Can you use NSArray in a subclass?
See 4 more
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What's a difference between NSArray and NSSet?
The main difference is that NSArray is for an ordered collection and NSSet is for an unordered collection. There are several articles out there that talk about the difference in speed between the two, like this one. If you're iterating through an unordered collection, NSSet is great.
What is Objective-C in iOS?
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.
Is NSArray ordered?
The answer is yes, the order of the elements of an array will be maintained - because an array is an ordered collection of items, just like a string is an ordered sequence of characters...
How do you define an array of objects in Objective-C?
Creating an Array Object For example: NSArray *myColors; myColors = [NSArray arrayWithObjects: @"Red", @"Green", @"Blue", @"Yellow", nil]; The above code creates a new array object called myColors and initializes it with four constant string objects containing the strings "Red", "Green", "Blue" and "Yellow".
Is Objective-C same as Swift?
For starters, Swift is easier to read and write than Objective-C. Swift also has a more concise syntax that makes it easier to understand code at a glance. In addition, Swift is more type-safe than Objective-C, meaning that it is less likely to produce unexpected results due to type mismatches.
Is Apple still using Objective-C?
While Objective-C is still supported by Apple and will likely not be deprecated anytime soon, there will be no updates to the language.
What is difference between array and NSArray?
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
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.
Can NSArray contain nil?
arrays can't contain nil. There is a special object, NSNull ( [NSNull null] ), that serves as a placeholder for nil.
What is an array vs object?
Objects represent “things” with characteristics (aka properties), while arrays create and store lists of data in a single variable.
What is array of object give example?
Each variable or object in an array is called an element. Unlike stricter languages, such as Java, you can store a mixture of data types in a single array. For example, you could have array with the following four elements: an integer, a window object, a string and a button object.
Why is an array an object?
The Array object lets you store multiple values in a single variable. It stores a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.
What is Objective-C in Xcode?
Objective-C is the programming language that is used to write applications for Apple's iOS and OS X operating systems. The Objective-C programming language is based on C, but it adds support for object-oriented programming. All Objective-C programming is done with the Foundation framework.
What is the meaning of Objective-C?
Objective-C is a thin layer atop C and is a "strict superset" of C, meaning that it is possible to compile any C program with an Objective-C compiler and to freely include C language code within an Objective-C class. Objective-C derives its object syntax from Smalltalk.
What is Objective-C mainly used for?
Objective-C is general-purpose language that is developed on top of C Programming language by adding features of Small Talk programming language making it an object-oriented language. It is primarily used in developing iOS and Mac OS X operating systems as well as its applications.
NSArray by example - Eezy Tutorials iOS
In this tutorial, we will be covering various functions available in NSArray. NSArray help us in creating static array. Modern Objective C Array notations.
ios - Initialize Array of Objects using NSArray - Stack Overflow
No one commenting on the randomAge method?. This is so awfully wrong, it couldn't be any wronger. NSInteger is a primitive type - it is most likely typedef'd as int or long.In the randomAge method, you calculate a number from about 1 to 98.. Then you can cast that number to an NSNumber.You had to add a cast because the compiler gave you a warning that you didn't understand.
How do I convert NSMutableArray to NSArray? - Stack Overflow
An NSMutableArray is a subclass of NSArray so you won't always need to convert but if you want to make sure that the array can't be modified you can create a NSArray either of these ways depending on whether you want it autoreleased or not: /* Not autoreleased */ NSArray *array = [[NSArray alloc] initWithArray:mutableArray]; /* Autoreleased array */ NSArray *array = [NSArray arrayWithArray ...
Objective-C Language Tutorial - NSArray - SO Documentation
Syntax. NSArray *words; // Declaring immutable array; NSMutableArray *words; // Declaring mutable array; NSArray *words = [NSArray arrayWithObjects: @"one", @"two ...
NSDictionary & NSMutableDictionary Tutorial - hayaGeek
In this Tutorial, I have covered the most useful methods of NSDictionary and NSMutableDictionary with examples. Below is the list of examples 1 Difference between NSDictionary and cheap levitra NSMutableDictionary 2) How to create NSDictionary with key and values
Working with Objective-C Array Objects - Techotopia
Accessing the Elements of an Array Object. The objects contained in an array are given index positions beginning at position zero. Each element may be accessed by passing the required index position through as an argument to the NSArray objectAtIndex instance method. We can, therefore, now extend our array example to display each element, using the count method to identify in advance how many ...
What is NSArray class?
The NSArray class adopts the NSCopying, NSMutableCopying, and NSCoding protocols; custom subclasses of NSArray should override the methods in these protocols as necessary. Remember that NSArray is the public interface for a class cluster and what this entails for your subclass.
What does return array containing?
Returns an array containing all the pathname elements in the receiving array that have filename extensions from a given array.
How does initialize a newly allocated array work?
Initializes a newly allocated array by placing in it the objects contained in a given array.
What does return array do?
Returns a new array that is a copy of the receiving array with the objects contained in another array added to the end.
What does return boolean mean?
Returns a Boolean value that indicates whether a given object is present in the array.
Can NSArray and CFArray be the same?
Although they are corresponding types, CFArray and NSArray do not have identical interfaces or implementations, and you can sometimes do things with CFArray that you cannot easily do with NSArray. For example, CFArray provides a set of callbacks, some of which are for implementing custom retain-release behavior.
Is NSArray toll free?
NSArray is “toll-free bridged” with its Core Foundation counterpart, CFAr ray. See Toll-Free Bridging for more information on toll-free bridging.
Which is faster, NSSortDescriptor or -compare?
The -compare: and block-based methods will be quite a bit faster, in general, than using NSSortDescriptor as the latter relies on KVC. The primary advantage of the NSSortDescriptor method is that it provides a way to define your sort order using data, rather than code, which makes it easy to e.g. set things up so users can sort an NSTableView by clicking on the header row.
What is the objectAtIndex method?
The objectAtIndex: method provides a single object. The first object in an NSArray is index 0. Since an NSArray can be homogenous (holding different types of objects), the return type is id ("any object"). (An id can be assigned to a variable of any other object type.) Importantly, NSArray s can only contain objects. They cannot contain values like int.
Can an array be compared for equality?
Arrays can be compared for equality with the aptly named isEqualToArray: method, which returns YES when both arrays have the same number of elements and every pair pass an isEqual: comparison.
What is NSArray class?
The NSArray class adopts the NSCopying, NSMutableCopying, and NSCoding protocols; custom subclasses of NSArray should override the methods in these protocols as necessary. Remember that NSArray is the public interface for a class cluster and what this entails for your subclass.
How does initialize a newly allocated array work?
Initializes a newly allocated array by placing in it the objects contained in a given array.
What does forkey return?
Returns an array containing the results of invoking value (forKey:) using key on each of the array's objects.
What does return array containing?
Returns an array containing all the pathname elements in the receiving array that have filename extensions from a given array.
What does return array do?
Returns a new array that is a copy of the receiving array with the objects contained in another array added to the end.
What does a comparator return?
Returns a new array that lists the receiving array’s elements in ascending order as defined by the comparison function comparator.
Can you use NSArray in a subclass?
Although they are corresponding types, CFArray and NSArray do not have identical interfaces or implementations, and you can sometimes do things with CFArray that you cannot easily do with NSArray. For example, CFArray provides a set of callbacks, some of which are for implementing custom retain-release behavior. If you specify NULL implementations for these callbacks, you can easily get a non-retaining array.
