Solution to http://opzi.posterous.com/challenge-2

opzy_challenge_2.js

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

    rotate = function (shift, str) {
      return str.slice(1) + shift;
    },

    isRotated = function (a, b) {
      return [].some.call(b, function (el) {
        return b = rotate(el, b), a === b;
      });
    };

console.log(A.reduce(function (prev, el, i) {
  return isRotated(el, B[i])
      ? prev + String.fromCharCode(parseInt(el, 2))
      : prev;
}, ''));