Concatenation in Objective-C

To concatenate two arrays in Objective-C, you can use the arrayByAddingObjectsFromArray: method of an NSArray. Here is an example:

NSArray *array1 = @[@"apple", @"banana", @"cherry"];
NSArray *array2 = @[@"date", @"elderberry", @"fig"];
NSArray *concatenatedArray = [array1 arrayByAddingObjectsFromArray:array2];
// concatenatedArray now contains: @[@"apple", @"banana", @"cherry", @"date", @"elderberry", @"fig"]

In this example, arrayByAddingObjectsFromArray: is called on array1 with array2 passed as the argument. The returned value (concatenatedArray) contains all the objects from array1 followed by all the objects from array2.