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Objective-C - Objective C - NSMutableArray
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  Sorting Arrays 
NSMutableArray *myColors = [NSMutableArray arrayWithObjects: @"red", @"green", @"blue", @"yellow", nil];
NSArray *sortedArray;
sortedArray = [myColors sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
  Creating an NSMutableArray

NSMutableArray can be initialized as an empty array like this:

NSMutableArray *array = [[NSMutableArray alloc] init];
// or
NSMutableArray *array2 = @[].mutableCopy;
// or
NSMutableArray *array3 = [NSMutableArray array];

NSMutableArray can be initialized with another array like this:

NSMutableArray *array4 = [[NSMutableArray alloc] initWithArray:anotherArray];
// or
NSMutableArray *array5 = anotherArray.mutableCopy;
  Adding elements 
NSMutableArray *myColors;
myColors = [NSMutableArray arrayWithObjects: @"Red", @"Green", @"Blue", @"Yellow", nil];
[myColors addObject: @"Indigo"];
[myColors addObject: @"Violet"];

//Add objects from an NSArray
NSArray *myArray = @[@"Purple",@"Orange"];
[myColors addObjectsFromArray:myArray];
  Insert Elements 
NSMutableArray *myColors;
int i;
int count;
myColors = [NSMutableArray arrayWithObjects: @"Red", @"Green", @"Blue", @"Yellow", nil];
[myColors insertObject: @"Indigo" atIndex: 1];
[myColors insertObject: @"Violet" atIndex: 3];
  Deleting Elements

Remove at specific index:

[myColors removeObjectAtIndex: 3];

Remove the first instance of a specific object:

[myColors removeObject: @"Red"];

Remove all instances of a specific object:

[myColors removeObjectIdenticalTo: @"Red"];

Remove all objects:

[myColors removeAllObjects];

Remove last object:

[myColors removeLastObject];
  Move object to another index

Move Blue to the beginning of the array:

NSMutableArray *myColors = [NSMutableArray arrayWithObjects: @"Red", @"Green", @"Blue", @"Yellow", nil];

NSUInteger fromIndex = 2;
NSUInteger toIndex = 0;

id blue = [[[self.array objectAtIndex:fromIndex] retain] autorelease];
[self.array removeObjectAtIndex:fromIndex];
[self.array insertObject:blue atIndex:toIndex];

myColors is now [@"Blue", @"Red", @"Green", @"Yellow"].
  Filtering Array content with Predicate

Using filterUsingPredicate: This Evaluates a given predicate against the arrays content and return objects that match.

Example:


     NSMutableArray *array = [NSMutableArray array];
      [array setArray:@[@"iOS",@"macOS",@"tvOS"]];
      NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF beginswith[c] 'i'"];
      NSArray *resultArray = [array filteredArrayUsingPredicate:predicate];
      NSLog(@"%@",resultArray);



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https://develop.horje.com/learn/1434/reference

 

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