countAndSay.js

/**
 * @param {number} n
 * @return {string}
**/

var countAndSay = function(number) {
  var string = '1';
  for (var i = 1; i < number; i++) {
    var stringToArray = string.split('');
    var counter = 1;
    string = '';
    
    for (var j = 0; j < stringToArray.length; j++) {
      if (stringToArray[j] !== stringToArray[j+1]) {
        string += counter + stringToArray[j];
      } else {
        counter++;
      }
    }
  }

  return string;
}

countAndSay(5);