Javascript String truncate String

function truncateString(str, num) {
  // Clear out that junk in your trunk
  
  var textTuncated = "";
  
  if (str.length > num) {
    // w  w w.j a  v a  2s .  co  m
    if (str.length > 3) {
      textTuncated = str.slice(0, num - 3);
      textTuncated = textTuncated + "...";
      str = textTuncated;
    } 
    
    if (num <= 3) {
      textTuncated = str.slice(0, num);
      textTuncated = textTuncated + "...";
      str = textTuncated;
    }
  }
    
  return str;
}

console.log(truncateString("A-tisket a-tasket A green and yellow basket", 11));
console.log(truncateString("Peter Piper picked a peck of pickled peppers", 14));
console.log(truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length));
console.log(truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length + 2));
console.log(truncateString("A-", 1));
console.log(truncateString("Absolutely Longer", 2));