NSMutableArray Values Are Not Being Assigned

Question

-(NSArray*)createArrayWithObjectsNamed:(NSString*)string{

    if (!_numberArray){
        [self createArrayOfNumbers];
    }

    NSString *object;
    NSMutableArray *mutableArray;

    for (int i = 0; i <= 9; i++) {
        object = [NSString stringWithFormat:@"%@%@",string,_numberArray[i]];
        NSLog(@"array %@",object);
        [mutableArray addObject:object];
    }

    NSLog(@"value of mutableArray  %@",mutableArray);

    NSArray *array; //= [NSArray arrayWithArray:mutableArray];

    array = [mutableArray copy];

    NSLog(@"array in func %@",array);

    return array;

}

Hi, when i run createArrayWithObjectNamed:string it should run the for statement ten times and at the end of the statement each time add the new object value, but it doesn't. when I run NSlog on the mutableArray it's value is (NULL).

What is going wrong here?

Answer 1

Your mutableArray variable is uninitialized. In this case it is nil, but it could very well be some arbitrary value, which could cause an EXC_BAD_ACCESS exception upon dereferencing.

NSMutableArray *mutableArray = [[NSMutableArray alloc] init];