truncate-a-string.js

/*
* Truncate a string (first argument) if it is longer than the given maximum string length (second argument).
* Return the truncated string with a ... ending.
* Note that inserting the three dots to the end will add to the string length.
* However, if the given maximum string length num is less than or equal to 3,
* then the addition of the three dots does not add to the string length in determining the truncated string.
* * * https://www.freecodecamp.org/challenges/truncate-a-string
*/


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

truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length);