Function bitwiseOp

chapter08/8.12 - Eight Queens/nQueens.js:19–32

(binaryString, n, callback)

};

var bitwiseOp = function(binaryString, n, callback) {
  var base10 = parseInt(binaryString, 2);
  base10 = callback(base10);
  var base2 = base10.toString(2);
  if (base2.length <= n) {
    var front = '';
    for (var i = base2.length; i < n; i++) {
      front += '0';
    }
    return front + base2;
  } else {
    return base2.slice(base2.length - n);
  }
};

var leftShift = function(binaryString, n) {
  return bitwiseOp(binaryString, n, (number) => number << 1);