JavaScript Password Strength Meter

- The script is meant to help users determine how strong their password is. - Basic logic used here to determine password strength is based on 'Permutations' theory. Permutation is the rearrangement of objects or symbols into distinguishable sequences. - Here, calculation of total number of permutations possible for given password that have to be used to crack password by 'Brute Force Attack' is done. Higher the number, stronger is the password. - Why not combinations? Ans.: Combination of elements of S is just a subset of S, where, the order of the elements is not taken into account, that means two lists with the same elements in different orders are considered to be the same combination e.g. {1,2} and {2,1} are same for combination. Also no elements can be repeated more than once in a combination e.g. {1,2,1} is not combination, as 1 is repeating. Hence use of combinations is not good strategy.