filtering NSArray into a new NSArray in objective-c

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Tarun Kumar · Answer

NSArray and
NSMutableArray provide methods to filter array contents. NSArray provides
filteredArrayUsingPredicate: which returns a new array containing objects in
the receiver that match the specified predicate. NSMutableArray adds
filterUsingPredicate: which evaluates the receiver’s content against the
specified predicate and leaves only objects that match. These methods are
illustrated in the following example.NSMutableArray *array =  [NSMutableArray  arrayWithObjects:@"Bill", @"Ben",                @"Chris", @"Melissa", nil];
NSPredicate  *bPredicate = [NSPredicate predicateWithFormat:           @"SELF beginswith[c] 'b'"];
NSArray *beginWithB =  [array filteredArrayUsingPredicate:bPredicate];
// beginWithB contains { @"Bill", @"Ben" }.
NSPredicate *sPredicate =  [NSPredicate predicateWithFormat:                @"SELF contains[c] 's'"];
[array  filterUsingPredicate:sPredicate];
// array now contains { @"Chris", @"Melissa" }

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filtering NSArray into a new NSArray in objective-c

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