Essential Books

Filtering Arrays With Predicates

suggest change 
NSArray *array = [NSArray arrayWithObjects:@"Nick", @"Ben", @"Adam", @"Melissa", nil];
NSPredicate *aPredicate = [NSPredicate predicateWithFormat:@"SELF beginswith[c] 'a'"];
NSArray *beginWithA = [array filteredArrayUsingPredicate:bPredicate];
     // beginWithA contains { @"Adam" }.
NSPredicate *ePredicate = [NSPredicate predicateWithFormat:@"SELF contains[c] 'e'"];
[array filterUsingPredicate:ePredicate];
    // array now contains { @"Ben", @"Melissa" }

More about

NSPredicate:

Apple doc : NSPredicate

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NSArray:
* NSArray
* Creating Arrays
* Accessing elements
* Reverse an Array
* Converting NSArray to NSMutableArray to allow modification
* Converting between Sets and Arrays
* Using Generics
* Comparing arrays
* Sorting Arrays
* Filtering Arrays With Predicates
* Enumerating using blocks
* Looping through
* Sorting array with custom objects
* Move object to another index
* Deleting Elements
* Insert Elements
* Adding elements
* Finding out the Number of Elements in an Array
* Add objects to NSArray
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