Nodejs Utililty Methods String Truncate

String.prototype.truncate = function(x){
  return this.length > x ? this.substr(0,x) : this ;

String.prototype.truncate = function(x){
  if(this.length < x) return this.valueOf();
  else return this.substring(0, x - 3) + "...";
};

String.prototype.truncateFilename = function() {
    var fileParts = this.split('.');
    var extension = fileParts[fileParts.length-1];
    var filename = this.substr(0, this.length - extension.length + 1);
    return filename.substr(0, 10) + '*.' + extension;
};

function truncateString(str, num) {
  if (str.length <= num) {
    return str;
  } else {
    return str.slice(0, num > 3 ? num - 3 : num) + '...';
truncateString("A-", 1);

function truncateString(str, num) {
  if(str.length > num){
    if(num < 3){
       str = str.slice(0,num) + "...";
    }else{
    str = str.slice(0,num-3) + "...";
    console.log("actual str is " + str);
  }else{
...

function truncateString(str, num) {
  var trunc;  
  if (num <= 3) {
    if (num < str.length){
      return str.slice(0,num) + "...";
    } else{
    trunc = str.slice(0,num);
    return trunc;
  } else if (num >= str.length) {
    return str;
  } else {
    trunc = str.slice(0,num - 3);
    return trunc + "...";
truncateString("A-tisket a-tasket A green and yellow basket", 11);