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//  We're using this array to play with:
NSArray* sample = [NSArray arrayWithObjects:@"foo",
                                            @"bar",
                                            @"baz",
                                            @"teapot",
                                            nil];


//  Shall we map them so f(x) -> "SOMETHING#{x}"?
NSArray* mapped = [sample mapWithBlock:^id(id obj) {
    return [NSString stringWithFormat:@"SOMETHING%@", obj];
}];


// Let's map x with its index
NSArray* mappedIndex = [sample mapWithIndexedBlock:
  ^id(NSUInteger idx, id obj) {
      return [NSString stringWithFormat:@"%@ AT INDEX %lu",
                                        obj,
                                        idx];
}];


//  How about reducing it?
id reduced = [sample reduceWithBlock:^id(id memo, id obj) {
    return [NSString stringWithFormat:@"%@-%@", memo, obj];
} andAccumulator:@""];


//  But we don't like teapots; let's remove them
BOOL (^discriminator)(id obj) = ^(id obj) {
  return [obj isEqual:@"teapot"];
};

NSArray* teapotFree = [sample removeWithPredicate:
                              discriminator];


//  Even better, let's segregate them
NSArray* segregated = [sample partitionWithBlock:
                              discriminator];


//  Now let's break *sample up into
//  an array of 2-element NSArrays
NSArray* chunked = [sample splitWithSize:2];