Password Scorer

password_scorer.js

// http://net.tutsplus.com/tutorials/javascript-ajax/meet-crockford%E2%80%99s-jscheck/

(function () {
    var PasswordScorer = {};
    PasswordScorer.score = function (password) {
        var len = password.length,
            lengthScore = 0,
            letterScore = 0,
            chars = {}
        if      (len >= 21) { lengthScore = 7; }
        else if (len >= 16) { lengthScore = 6; }
        else if (len >= 13) { lengthScore = 5; }
        else if (len >= 10) { lengthScore = 4; }
        else if (len >=  8) { lengthScore = 3; }
        else if (len >=  5) { lengthScore = 2; }
        var re = [ null, /[a-z]/g, /[A-Z]/g, /\d/g, /[!@#$%\^&\*\(\)=_+-]/g];
        for (var i = 1; i < re.length; i++) {
            letterScore += (password.match(re[i]) || []).length * i;
        }
        return letterScore + lengthScore;
    };
    (typeof window !== 'undefined' ? window : exports).PasswordScorer = PasswordScorer;
}());