p2.js

// opzi problem 2
// http://opzi.posterous.com/challenge-2

var count = 0,
    SET_A = ['01001100','01101000','01010000','01010011','01001001','01000011','01101000','01101001','01110110','01101001','01110000','01101100','01100010','01000111','01101000','01111010','01100101','01111001','01101101','01100001'],
    SET_B = ['10010001','01011110','01100101','10011010','10000010','11110000','11010000','00101101','11111000','11010110','11100000','00011011','01101110','11110000','01101100','01101010','11001010','11001011','01101110','01110010'];

SET_A.forEach(function (s) {
    var str = s.split(''),
        ls = str.length;
    for (var x = 0, y; x < ls; x++) {
        y = str.pop();
        str.unshift(y);
        if (str.join('') === SET_B[count]) {
            console.log(s);
        }
    }
    count += 1;
});