test `isEqual:`, `isEqualToArray:`, `==`

result

(array1 == array2) => 0 
 [array1 isEqualToArray:array2] => 1 
 [array1 isEqual:array2] => 1

TestCode.m

    NSString *string1 = @"first string";
    NSString *string2 = @"second string";
    
    NSArray *array1 = [NSArray arrayWithObjects:string1, string2, nil];
    NSArray *array2 = [NSArray arrayWithObjects:string1, string2, nil];
    NSLog(@"(array1 == array2) => %d \n [array1 isEqualToArray:array2] => %d \n [array1 isEqual:array2] => %d",
          (array1 == array2),
          [array1 isEqualToArray:array2],
          [array1 isEqual:array2]);