http://www.freecodecamp.com/orelovo 's solution for Bonfire: Truncate a string

bonfire-truncate-a-string.js

// Bonfire: Truncate a string
// Author: @orelovo
// Challenge: http://www.freecodecamp.com/challenges/bonfire-truncate-a-string
// Learn to Code at Free Code Camp (www.freecodecamp.com)

function truncate(str, num) {
  var newStr = "";
  if (num >= str.length)
    newStr = str;
  else if (num <= 3)
    newStr = str.slice(0, num) + "...";
  else
    newStr = str.slice(0, num-3) + "...";
  return newStr;
}

truncate("A-tisket a-tasket A green and yellow basket", 11);