Nodejs Utililty Methods String Trim

String.prototype.trim = function () {
  return this .replace(/^\s\s*/, '' ).replace(/\s\s*$/, '' );
function isEmpty(str){
  if(str == null || str== undefined || str.trim().length == 0)
    return true;
  else
    return false;

String.prototype.trim = function () {
    var str = this.replace( /^\s\s*/, '' ),
        ws = /\s/,
        i = str.length;
    while ( ws.test( str.charAt( i -= 1 ) ) ) {}
    return str.slice( 0, i + 1 );
};

String.prototype.trim = function () {
    var str = this.replace( /^\s\s*/, '' ),
        ws = /\s/,
        i = str.length;
    while ( ws.test( str.charAt( i -= 1 ) ) ) {}
    return str.slice( 0, i + 1 );
};

String.prototype.trim = function () {
    return this.replace(/^\s+|\s+$/g,'');
};
String.prototype.ltrim = function() {
    return this.replace(/^\s+/,'');
};
String.prototype.rtrim = function() {
    return this.replace(/\s+$/,'');
};
...

String.prototype.trim = function() { return this.replace(/^\s+|\s+$/g, ''); }
function isProbablyUrl(string) {
  var substr = string.substring(0,4).toLowerCase();
  if (substr == 'ftp:' || substr == 'www.') return true;
  var substr = string.substring(0,5).toLowerCase();
  if (substr == 'http:') return true;
  var substr = string.substring(0,6).toLowerCase();
  if (substr == 'https:') return true;
  var substr = string.substring(0,7).toLowerCase();
...

String.prototype.trim = function() {
    return this.replace(/^\s+|\s+$/g, "");

String.prototype.trim=function()
  return this.replace(/^\s+|\s+$/g, '');
String.prototype.ltrim=function()
  return this.replace(/^\s+/,'');
String.prototype.rtrim=function()
...

String.prototype.trim = function() {
  this.replace(/(^\s*)|(\s*$)/gi,'');
  this.replace(/[ ]{2,}/gi,' ');
  this.replace(/\n /,'\n');
  return this;
};

String.prototype.trim = function(){
  var start,end;
  start=0;
  end=this.length-1;
  while(start<=end && this.charAt(start)==' '){
    start++;
  while(start<=end && this.charAt(end)==" "){
    end--;
...

Array.isArray = Array.isArray || function (obj) {
  return toString.call(obj) === '[object Array]';
};
String.prototype.trim = String.prototype.trim || function () {
  var str = this.replace(/^\s\s*/, ''),
    i = str.length;
  for (let rgxp = /\s/; rgxp.test(str.charAt(--i));) {}
  return str.substring(0, i + 1);
};
...