Javascript Array isCharPresent(charSearch)

Array.prototype.isCharPresent = function(charSearch) {
  var arr = this;
  var result = [];
  var testingStr = '';
  if (charSearch.length > 1) {
    return "You're searching for more than one char";
  }/*  ww w . j  a  va  2  s .  c o m*/

  for (var i = 0; i < this.length; i++) {
    if (arr[i].indexOf(charSearch) === -1) {
      continue;
    } else {
      result.push(arr[i]);
    }
  }

  return result;
  //search through eachChar
}

console.log(["alphabet", "oxygen", "result"].isCharPresent('a'));
console.log(["alphabet", "oxygen", "result"].isCharPresent('al'));
console.log(["alphabet", "oxygen", "result"].isCharPresent('e'));