how to remove duplicate value in NSMutableArray

Question

i\'m scanning wifi info using NSMutableArray, but there are few duplicate values appear, so i try to use following code but still getting the duplicate values,

Answer 1

This is another way:

- (NSArray *)removeDuplicatesFrom:(NSArray *)array {
    NSSet *set = [NSSet setWithArray:array];
    return [set allObjects];
}