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 NSArray ordered?
A static ordered collection of objects.
What is immutable array?
An immutable array or object is a unique copy of the original that, when manipulated, does not affect the original.
What is an Nsrange?
A structure used to describe a portion of a series, such as characters in a string or objects in an array.
What is NSMutableString?
NSMutableString is the abstract base class for a cluster of classes representing strings whose contents can be changed. It inherits from NSString. It extends the interface it inherits from NSString by adding methods to change the string contents.
How do I add elements to NSArray?
If you create an NSArray you won’t be able to add elements to it, since it’s immutable. You should try using NSMutableArray instead. Also, you inverted the order of alloc and init . alloc creates an instance and init initializes it.
What is an array inside an array called?
An array inside an array is called a nested array. I don’t use these much in PowerShell but I have used them more in other languages. Consider using an array of arrays when your data fits in a grid like pattern. Here are two ways we can create a two-dimensional array.
How to multiply an array by an integer?
An interesting little trick is that you can multiply an array by an integer. A common scenario is that you want to create an array with all zeros. If you’re only going to have integers, a strongly typed array of integers defaults to all zeros. We can use the multiplying trick to do this too.
Why can’t I assign an object[] to an integer[] variable?
Specifically, Object [] is a supertype of Integer [] and as such is not assignment-compatible with it. You must create an Integer [] at the outset to be able to assign it to an Integer [] -typed variable. From your posted code I can see no reason why you would not do that.
What are integers?
Integers or integer values are part of various numbering systems. Numbering systems are ways of counting and categorizing real and imaginary objects. Integers are one set of numbers or numbering system you use every day. Common numbering systems you may encounter include all these: