I have an `NSArray` formed with objects of a custom class. The class has 3 (city, state, zip) string properties. I would like to get all unique state values from the `array`.

I did read through the `NSPredicate` class but couldn&#39;t make much of how to use it in this case. The only examples I could find were for string operations.

Can someone please help me out?

iPhone - getting unique values from NSArray object

UIAlertSheet&#39;s constructor takes an otherButtonTitles parameter as a varg list. I&#39;d like to specify the other button titles from an NSArray instead. Is this possible?

i.e. I have to do this:

    id alert = [[UIActionSheet alloc] initWithTitle: titleString
                                      delegate: self
                                      cancelButtonTitle: cancelString
                                      destructiveButtonTitle: nil
                                      otherButtonTitles: button1Title, button2Title, nil];

But since I&#39;m generating the list of available buttons at runtime, I really want something like this:

    id alert = [[UIActionSheet alloc] initWithTitle: titleString
                                           delegate: self
                                  cancelButtonTitle: cancelString
                             destructiveButtonTitle: nil
                                  otherButtonTitles: otherButtonTitles];

Right now, I&#39;m thinking that I need to have a seperate call to `initWithTitle:` for 1 item, 2 items and 3 items. Like this:

    if ( [titles count] == 1 ) {
         alert = [[UIActionSheet alloc] initWithTitle: titleString
                                             delegate: self
                                    cancelButtonTitle: cancelString
                               destructiveButtonTitle: nil
                                    otherButtonTitles: [titles objectAtIndex: 0], nil];
    } else if ( [titles count] == 2) {
         alert = [[UIActionSheet alloc] initWithTitle: titleString
                                             delegate: self
                                    cancelButtonTitle: cancelString
                               destructiveButtonTitle: nil
                                    otherButtonTitles: [titles objectAtIndex: 0], [titles objectAtIndex: 1],  nil];
    } else {
        // and so on
    }

That&#39;s a lot of duplicate code, but it might actually be reasonable since I have at most three buttons. How can I avoid this?

Use NSArray to specify otherButtonTitles?

How to search an NSSet or NSArray for an object which has an specific value for an specific property?

Example: I have an NSSet with 20 objects, and every object has an `type` property. I want to get the first object which has `[theObject.type isEqualToString:@&quot;standard&quot;]`.

I remember that it was possible to use predicates somehow for this kind of stuff, right?

How to search an NSSet or NSArray for an object which has an specific value for an specific property?

I have an NSArray of NSNumbers and want to find the maximum value in the array. Is there any built in functionality for doing so? I am using iOS4 GM if that makes any difference.

Finding maximum numeric value in NSArray

I&#39;m trying to update an MKMapView by removing all annotations outside the visible area, and adding and removing some annotations inside the visible area. This is my code:

    NSSet *visibleAnnotations = [mapView annotationsInMapRect:[mapView visibleMapRect]];
    NSSet *allAnnotations = [NSSet setWithArray:[mapView annotations]];
    NSMutableSet *nonVisibleAnnotations = [NSMutableSet setWithSet:allAnnotations];
    [nonVisibleAnnotations minusSet:visibleAnnotations];
    [mapView removeAnnotations:(NSArray *)nonVisibleAnnotations];
    
    NSMutableSet *newAnnotations = [NSMutableSet setWithArray:[_zoomLevels objectAtIndex:clusterLevel]];
    [newAnnotations minusSet:visibleAnnotations];
    [mapView addAnnotations:(NSArray *)newAnnotations];

This gives me the error **-[__NSCFSet objectAtIndex:]: unrecognized selector sent to instance 0x13cd40** after the final line in which I cast newAnnotations to an NSArray then add the annotations. Is there something about casting an array to a set that causes this? If so, is there a way round it?

NSSet to NSArray casting calling objectAtIndex?

In a Master-Detail app I&#39;d like to display a TableView with 5 sections titled:

 1. Your Move
 2. Their Move
 3. Won Games
 4. Lost Games
 5. Options

So I create a blank Master-Detail app in Xcode 5.0.2 and then in its MasterViewController.m (which is a UITableViewController) I&#39;m trying to implement the method:

    - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
        return _titles[section];
    }

**My question** is however how to init the NSArray _titles?

I&#39;m trying in the MasterViewController.m:

    #import &quot;MasterViewController.h&quot;
    #import &quot;DetailViewController.h&quot;
    
    static NSArray *_titles_1 = @[
        @&quot;Your Move&quot;,
        @&quot;Their Move&quot;,
        @&quot;Won Games&quot;,
        @&quot;Lost Games&quot;,
        @&quot;Options&quot;
    ];
    
    @interface MasterViewController () {
        NSMutableArray *_games;
        
        NSArray *_titles_2 = @[
                             @&quot;Your Move&quot;,
                             @&quot;Their Move&quot;,
                             @&quot;Won Games&quot;,
                             @&quot;Lost Games&quot;,
                             @&quot;Options&quot;
        ];
    }
    @end
    
    @implementation MasterViewController
    
    - (void)awakeFromNib
    {
        if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
            self.clearsSelectionOnViewWillAppear = NO;
            self.preferredContentSize = CGSizeMake(320.0, 600.0);
        }
        [super awakeFromNib];
    }
    
    - (void)viewDidLoad
    {
         ....
    }

but both tries above give me syntax errors:

![enter image description here][1]

**UPDATE:**

To my surprise there are many suggestions for this simple question, but as an iOS/Objective-C newbie I&#39;m not sure, which solution is most appropriate.

`dispatch_once` - isn&#39;t it a runtime operation to execute something once in a multi-threaded app? Isn&#39;t it overkill here? I was expecting a compile-time solution for initiating a const array...

`viewDidLoad` - when my app changes between background and foreground, wouldn&#39;t it unnecessary initiate my const array again and again?

Shouldn&#39;t I better set the `NSArray` in `awakeFromNib` (since I use stroyboard scenes for all my ViewControllers)? Or maybe in `initSomething` (is the correct method `initWithStyle`?)

  [1]: http://i.stack.imgur.com/misKY.png

Static NSArray of strings - how/where to initialize in a View Controller

I am wondering how to convert an **NSArray** ` [@&quot;Apple&quot;, @&quot;Pear &quot;, 323, @&quot;Orange&quot;] ` to a string in **Objective-C**.

Convert NSArray to NSString in Objective-C

I am new to Core Data. I have noticed that collection types are not available as attribute types and would like to know what the most efficient way is of storing array/dictionary type data as an attribute (e.g. the elements that make up an address like street, city, etc. does not require a separate entity and is more conveniently stored as a dictionary/array than separate attributes/fields). Thank you.

Best practice? - Array/Dictionary as a Core Data Entity Attribute

So I have an `NSArray` &quot;myArray&quot; with `NSNumber`s and `NSString`s. I need them in another `UIView` so i go like this:

    - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
	
	DetailViewController *details = [[DetailViewController alloc] initWithNibName:@&quot;DetailView&quot; bundle:nil];
	details.subjectText = [[myArray objectAtIndex:indexPath.row] objectForKey:@&quot;subject&quot;];

The subjectText works.
But how can I get the `NSNumber`s out of it? (I actually need them as strings...)
I would convert a `NSString` out of a `NSNumber` like this:
`NSString *blah = [NSNumber intValue]`. But I don&#39;t know how to set it up in the code above...

How to convert NSNumber to NSString

I&#39;m looking for a method of turning a NSMutableArray into a string. Is there anything on a par with this Ruby array method?

    &gt;&gt; array1 = [1, 2, 3]
    &gt;&gt; array1.join(&#39;,&#39;)
    =&gt; &quot;1,2,3&quot;

Cheers!

Join an Array in Objective-C

I have an `NSArray` and I&#39;d like to create a new `NSArray` with objects from the original array that meet certain criteria. The criteria is decided by a function that returns a `BOOL`.

I can create an `NSMutableArray`, iterate through the source array and copy over the objects that the filter function accepts and then create an immutable version of it.

Is there a better way?


filtering NSArray into a new NSArray in Objective-C

Is there any built-in function that allows me to deep copy an `NSMutableArray`?

I looked around, some people say `[aMutableArray copyWithZone:nil]` works as deep copy. But I tried and it seems to be a shallow copy.

Right now I am manually doing the copy with a `for` loop:

    //deep copy a 9*9 mutable array to a passed-in reference array

    -deepMuCopy : (NSMutableArray*) array 
    	toNewArray : (NSMutableArray*) arrayNew {
    
    	[arrayNew removeAllObjects];//ensure it&#39;s clean
    
    	for (int y = 0; y&lt;9; y++) {
    		[arrayNew addObject:[NSMutableArray new]];
    		for (int x = 0; x&lt;9; x++) {
    			[[arrayNew objectAtIndex:y] addObject:[NSMutableArray new]];
    				
    			NSMutableArray *aDomain = [[array objectAtIndex:y] objectAtIndex:x];
    			for (int i = 0; i&lt;[aDomain count]; i++) {
    				
    				//copy object by object
    				NSNumber* n = [NSNumber numberWithInt:[[aDomain objectAtIndex:i] intValue]];
    				[[[arrayNew objectAtIndex:y] objectAtIndex:x] addObject:n];
    			}
    		}
    	}
    }

but I&#39;d like a cleaner, more succinct solution.

Deep copying an NSArray

Let&#39;s say that I have this code:

    class Stat {
       var statEvents : [StatEvents] = []
    }

    struct StatEvents {
       var name: String
       var date: String
       var hours: Int
    }


    var currentStat = Stat()

    currentStat.statEvents = [
       StatEvents(name: &quot;lunch&quot;, date: &quot;01-01-2015&quot;, hours: 1),
       StatEvents(name: &quot;dinner&quot;, date: &quot;01-01-2015&quot;, hours: 1),
       StatEvents(name: &quot;dinner&quot;, date: &quot;01-01-2015&quot;, hours: 1),
       StatEvents(name: &quot;lunch&quot;, date: &quot;01-01-2015&quot;, hours: 1),
       StatEvents(name: &quot;dinner&quot;, date: &quot;01-01-2015&quot;, hours: 1)
    ]

    var filteredArray1 : [StatEvents] = []
    var filteredArray2 : [StatEvents] = []


I could call as many times manually the next function in order to have 2 arrays grouped by &quot;same name&quot;.

    filteredArray1 = currentStat.statEvents.filter({$0.name == &quot;dinner&quot;})
    filteredArray2 = currentStat.statEvents.filter({$0.name == &quot;lunch&quot;})
The problem is that I won&#39;t know the variable value, in this case &quot;dinner&quot; and &quot;lunch&quot;, so I would like to group this array of statEvents automatically by name, so I get as many arrays as the name gets different.

How could I do that?

How to group by the elements of an array in Swift

I&#39;m able to put the contents of an `NSSet` into an `NSMutableArray` like this:

    NSMutableArray *array = [set allObjects];

The compiler complains though because [set allObjects] returns an `NSArray` not an `NSMutableArray`. How should this be fixed?

How to return an NSMutableArray from an NSSet

I have an NSArray that I want to filter out certain objects using an NSPredicate, I was hoping I could use NOT IN since I saw that I can easily do an IN.

So I have my array:

    self.categoriesList

Then I get the values I want to remove:

    NSArray *parentIDs = [self.cateoriesList valueForKeyPath:@&quot;@distinctUnionOfObjects.ParentCategoryID&quot;];

This gives me a list of ParentCategoryID&#39;s for categories I DO NOT want to display, so I figure I can use an NSPredicate to remove them:

    self.cateoriesList = [self.cateoriesList filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@&quot;CategoryID NOT IN %@&quot;,parentIDs]];

This fails:

    reason: &#39;Unable to parse the format string &quot;CategoryID NOT IN %@&quot;&#39;

If I wanted to use just IN that works perfectly of course.
 

NSArray with NSPredicate using NOT IN


I have an array of dictionaries.

I want to filter the array based on a key.

I tried this:
 

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@&quot;(SPORT ==  %@)&quot;, @&quot;Football&quot;];
    
    NSArray *filteredArray = [data filteredArrayUsingPredicate:predicate];

This doesn&#39;t work, I get no results. I think I&#39;m doing something wrong. I know this is the method if &quot;SPORT&quot; was an ivar. I think it is probably different if it is a key.

I haven&#39;t been able to find an example however.


Thanks


----------

**Update**

I added quotes around the string I am searching for.

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@&quot;(SPORT ==  &#39;%@&#39;)&quot;, @&quot;Football&quot;];

It still does not work.


----------

**Update 2**

Solved it. I actually had to remove the single quotes, which seems to go against what the guide says.

My real problem is I had a nested array and I wasn&#39;t actually evaluating the dictionaries. Bone head move.



Using NSPredicate to filter an NSArray based on NSDictionary keys

I&#39;m looking for the standard idiom to iterate over an NSArray. My code needs to be suitable for OS X 10.4+.

How do I iterate over an NSArray?

What&#39;s the usual way to store c-structures in an `NSArray`? Advantages, disadvantages, memory handling?

Notably, what&#39;s the difference between `valueWithBytes` and `valueWithPointer`  -- raised by justin and catfish below.

[Here&#39;s a link][1] to Apple&#39;s discussion of `valueWithBytes:objCType:` for future readers...

For some lateral thinking and looking more at performance, Evgen has raised the issue of using `STL::vector` in **C++**.

*(That raises an interesting issue: is there a fast c library, not unlike `STL::vector` but much much lighter, that allows for the minimal &quot;tidy handling of arrays&quot; ...?)*

So the original question...

For example:

    typedef struct _Megapoint {
    	float	w,x,y,z;
    } Megapoint;

So: what&#39;s the normal, best, idiomatic way to store one&#39;s own structure like that in an `NSArray`, and how do you handle memory in that idiom?

Please note that I am specifically looking for the usual idiom to store structs.  Of course, one could avoid the issue by making a new little class. However I want to know how the usual idiom for actually putting structs in an array, thanks.

BTW here&#39;s the NSData approach which is perhaps? not best...

    Megapoint p;
    NSArray *a = [NSArray arrayWithObjects:
    	[NSData dataWithBytes:&amp;p length:sizeof(Megapoint)],
    	[NSData dataWithBytes:&amp;p length:sizeof(Megapoint)],
    	[NSData dataWithBytes:&amp;p length:sizeof(Megapoint)],
    		nil];

BTW as a point of reference and thanks to Jarret Hardie, here&#39;s how to store `CGPoints` and similar in an `NSArray`:

    NSArray *points = [NSArray arrayWithObjects:
    		[NSValue valueWithCGPoint:CGPointMake(6.9, 6.9)],
    		[NSValue valueWithCGPoint:CGPointMake(6.9, 6.9)],
    		nil];

(see https://stackoverflow.com/questions/899600/how-can-i-add-cgpoint-objects-to-an-nsarray-the-easy-way)

  [1]: http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/NumbersandValues/Articles/Values.html#//apple_ref/doc/uid/20000174-BAJJHDEG

What&#39;s the best way to put a c-struct in an NSArray?

I&#39;ve been using `enumerateObjectsUsingBlock:` a lot lately for my fast-enumeration needs, and I&#39;m having a hard time understanding the usage of `BOOL *stop` in the enumeration block.

The `NSArray` class reference states

&gt; `stop`: A reference to a Boolean value. The block can set the value to `YES` to
&gt; stop further processing of the array. The `stop` argument is an out-only
&gt; argument. You should only ever set this Boolean to `YES` within the
&gt; Block.

So then of course I can add the following in my block to stop the enumeration:


    if (idx == [myArray indexOfObject:[myArray lastObject]]) {
        *stop = YES;
    }

From what I&#39;ve been able to tell, not explicitly setting `*stop` to `YES` doesn&#39;t have any negative side effects. The enumeration seems to automatically stop itself at the end of the array. So is using `*stop` really necessary in a block?

What is the BOOL *stop argument for enumerateObjectsUsingBlock: used for?

Is it possible to get all the keys from a specific `NSDictionary` as a seperate `NSArray`?

Get all keys of an NSDictionary as an NSArray

I have an `NSArray` that contains date strings **(i.e. NSString)** like this: &quot;Thu, 21 May 09 19:10:09 -0700&quot;

I need to sort the `NSArray` by date.  I thought about converting the date string to an `NSDate` object first, but got stuck there on how to sort by the `NSDate` object.

Thanks.

Sort NSArray of date strings or objects

I&#39;m using the iPhone SDK (3.0) and I&#39;m trying to create an **array of selectors** to invoke a variety of methods within one class.

Obviously, I&#39;m doing something wrong (I think @selector isn&#39;t considered a class and so stuffing them into an NSArray isn&#39;t working).

I tried this, but it&#39;s obviously wrong.  

**Is there a simple way to have an array of selectors like this?  Or is there a better way to iterate through a collection of methods?**

    selectors = [NSArray arrayWithObjects:
                              @selector(method1),
                              @selector(method2),
                              @selector(method3),
                              @selector(method4),
                              @selector(method5),
                              @selector(method6),
                              @selector(method7), nil];
    
    for (int i = 0; i &lt; [selectors count]; i++) {
        if ([self performSelector:[selectors objectAtIndex:i]]) // do stuff;
    }

How to create an &quot;array of selectors&quot;

I&#39;ve seen a few examples of this but all of those seem to rely on knowing which element you want to count the occurrences of. My array is generated dynamically so I have no way of knowing which element I want to count the occurrences of (I want to count the occurrences of all of them). Can anyone advise?

Thanks in advance

EDIT:

Perhaps I should have been clearer, the array will contain multiple different strings (e.g. 
`[&quot;FOO&quot;, &quot;FOO&quot;, &quot;BAR&quot;, &quot;FOOBAR&quot;]`

How can I count the occurrences of foo, bar and foobar without knowing what they are in advance?

How to count occurrences of an element in a Swift array?

I have an array with a bunch of strings and I want to check if a certain string is contained in the array. If I use the `containsObject`: message on the array, I&#39;m getting correct results. Do all `NSString` objects with the same string point to the same object? Or why is the `containsObject`: working?


    NSArray *stringArray = [NSArray arrayWithObjects:@&quot;1&quot;,@&quot;2&quot;,@&quot;3&quot;,anotherStringValue, nil];
    if([stringArray containsObject:@&quot;2&quot;]){
      //DO SOMETHING
    }



Check if NSString instance is contained in an NSArray

I have a UItableview with reordable rows and the data is in an NSarray. So how do I move an object in the NSMutablearray when the appropriate tableview delegate is called?

Another way to ask this is how to reorder an NSMutableArray?

NSMutablearray move object from index to index

How do I convert NSMutableArray to NSArray in [tag:Objective-C]?


  [1]: http://en.wikipedia.org/wiki/Objective-C

How do I convert NSMutableArray to NSArray?

I am having a problem regarding sorting an array w.r.t database:

    NSSortDescriptor *sorter = [[NSSortDescriptor alloc] initWithKey:@&quot;w&quot; ascending:YES];
	NSArray *sortDescriptors = [NSArray arrayWithObject: sorter]; 
	
	[mGlossaryArray sortUsingDescriptors:sortDescriptors]; 
	[sorter release];

Here in database there are some first capital letters and because of that capital letter it does not show me proper sorted output. Here i am sorting an array with r.t &quot;w&quot; which is my table column in database.
Here I have attach the screen shot for the output, which says that &quot;Cancer&quot; comes first than &quot;c&quot;, but this is not correct, it is not giving alphabetically sort because of the capitalized words.

eg. if there is &quot;able&quot; in lower case and &quot;aCid&quot; then it will show aCid first and then able, and there is  also a case where if the 1st letter is caps it comes first eg, &quot;Able&quot; and &quot;a&quot;. Here Able displays first.![enter image description here][1]


  [1]: http://i.stack.imgur.com/zsDiu.png

I want to sort an array using NSSortDescriptor

I&#39;ve got an `NSArray` and have to iterate over it in a special case backwards, so that I first look at the last element. It&#39;s for performance reasons: If the last one just makes no sense, all previous ones can be ignored. So I&#39;d like to break the loop. But that won&#39;t work if I iterate forward from 0 to n. I need to go from n to 0. Maybe there is a method or function I don&#39;t know about, so I wouldn&#39;t have to re-invent the wheel here.

Is there an easy way to iterate over an NSArray backwards?

I&#39;m struggling with trying to sort an array of dictionaries.

My dictionaries have a couple of values of interest, price, popularity etc.

Any suggestions?

Best way to sort an NSArray of NSDictionary objects?

I need to reverse my `NSArray`.

As an example:

`[1,2,3,4,5]` must become: `[5,4,3,2,1]`

What is the best way to achieve this?

How can I reverse a NSArray in Objective-C?

I am getting an array with null value. Please check the structure of my array below:

     (
        &quot;&lt; null&gt;&quot;
     )

When I&#39;m trying to access index 0 its crashing because of

    -[NSNull isEqualToString:]: unrecognized selector sent to instance 0x389cea70

Currently its crashing because of that array with a crash log:

     *** Terminating app due to uncaught exception &#39;NSInvalidArgumentException&#39;, reason: &#39;-[NSNull isEqualToString:]: unrecognized selector sent to instance 0x389cea70&#39;
    *** First throw call stack:
    (0x2d9fdf53 0x3820a6af 0x2da018e7 0x2da001d3 0x2d94f598 0x1dee57 0x1dfd31 0x302f598d 0x301a03e3 0x3052aeed 0x3016728b 0x301659d3 0x3019ec41 0x3019e5e7 0x30173a25 0x30172221 0x2d9c918b 0x2d9c865b 0x2d9c6e4f 0x2d931ce7 0x2d931acb 0x3262c283 0x301d3a41 0xabb71 0xabaf8)
    libc++abi.dylib: terminating with uncaught exception of type NSException

How can I check if an object in an NSArray is NSNull?

i am trying to get index of an array through **indexOfObject** method as follows but when i try to log the value to test the index i get a garbage value.. for testing purposes i am having an array with values `{57,56,58..}` to get an index of lets say `56`,

    NSNumber *num = [NSNumber numberWithInteger:56];
    NSInteger Aindex = [myArray indexOfObject:num];
    NSLog(@&quot; %d&quot;,Aindex);

the value i get is something like `2323421`. what am i possibly doing wrong??

Getting Index of an Object from NSArray?

Is there any convenient way to take an array/set of objects and create a new array/set containing some property of each item in the first array?

For example, an array contains Car objects.  I need an array of licensePlates, where each car has an NSObject car.licensePlate.

Currently I just iterate through the first array adding objects to my mutable results array, but was wondering if there is an instantiation method that exists for this (checked the docs for NSArray).

Creating an array from properties of objects in another array

What is the difference between `copy` and `mutableCopy` when used on either an `NSArray` or an `NSMutableArray`?


This is my understanding; is it correct?

    // ** NSArray **
    NSArray *myArray_imu = [NSArray  arrayWithObjects:@&quot;abc&quot;, @&quot;def&quot;, nil];
    
    // No copy, increments retain count, result is immutable
    NSArray *myArray_imuCopy = [myArray_imu copy];
    
    // Copys object, result is mutable 
    NSArray *myArray_imuMuta = [myArray_imu mutableCopy];
    
    // Both must be released later
    	
--- 
	
    // ** NSMutableArray **
    NSMutableArray *myArray_mut = [NSMutableArray arrayWithObjects:@&quot;A&quot;, @&quot;B&quot;, nil];
    	
    // Copys object, result is immutable
    NSMutableArray *myArray_mutCopy = [myArray_mut copy];
    
    // Copys object, result is mutable
    NSMutableArray *myArray_mutMuta = [myArray_mut mutableCopy];

    // Both must be released later
    

How do copy and mutableCopy apply to NSArray and NSMutableArray?

I have an array populated by dictionaries, and I need to sort the array alphabetically by the values of one of the keys of the dictionaries.

This is my array:

    tu dictus: (
        {
        brand = Ryul;
        productTitle = Any;
        quantity = 1;
        subBrand = &quot;Ryul INJ&quot;;
        type = Product;
    },
        {
        brand = Trol;
        productTitle = Different;
        quantity = 2;
        subBrand = &quot;&quot;;
        type = Brand;
    },
        {
        brand = Dtor;
        productTitle = Any;
        quantity = 1;
        subBrand = &quot;&quot;;
        type = Product;
    },
        {
        brand = Ryul;
        productTitle = Different;
        quantity = 2;
        subBrand = &quot;Ryul CHES&quot;;
        type = SubBrand;
    },
        {
        brand = Anan;
        productTitle = Any;
        quantity = 1;
        subBrand = &quot;&quot;;
        type = Product;
    }
    )


Normally for sorting an array I will use 

    myArray = [uniqueProdsArray sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];

But how do sort using the `brand` key of the dictionary?

Sorting NSArray of dictionaries by value of a key in the dictionaries

I converted an NSIndexSet to an [Int] array using the answer at https://stackoverflow.com/a/28964059/6481734 I need to do essentially the opposite, turning the same kind of array back into an NSIndexSet.

Create NSIndexSet from integer array in Swift

What is the difference b/w `NSArray` and `NSMutableArray`?

All Nsarray Solutions on Gang of Coders

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