http://www.freecodecamp.com/dbess1 's solution for Bonfire: Truncate a string

bonfire-truncate-a-string.js

// Bonfire: Truncate a string
// Author: @dbess1
// Challenge: http://www.freecodecamp.com/challenges/bonfire-truncate-a-string
// Learn to Code at Free Code Camp (www.freecodecamp.com)

function truncate(str, num) {

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

truncate("A-tisket a-tasket A green and yellow basket", 11);
truncate("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length);
truncate("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length + 2);
truncate("A-", 1);
truncate("Absolutely Longer", 2);