Nodejs Utililty Methods String Trim

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

String.prototype.trim = function (c) {
    if (c) {
        var r = new RegExp('(^' + c + ')|(' + c + '$)', 'g');
        return this.replace(r, '');
    } else {
        return this.replace(/^\s+|\s+$/g,'');
};
String.prototype.capitalize = function() {
...

String.prototype.trim = function(c, t){
  return c = "[" + (c == undefined ? " " : c.replace(/([\^\]\\-])/g, "\\\$1")) + "]+",
  this.replace(new RegExp((t != 2 ? "^" : "") + c + (t != 1 ? "|" + c + "$" : ""), "g"), "");
};

String.prototype.trim = function(c, t){
  return c = "[" + (c == undefined ? " " : c.replace(/([\^\]\\-])/g, "\\\$1")) + "]+",
  this.replace(new RegExp((t != 2 ? "^" : "") + c + (t != 1 ? "|" + c + "$" : ""), "g"), "");
};

String.prototype.trim = function(ch) {
    var r = new RegExp("^{0}+|{0}+$".format(ch || "\\s"), "g");
    return this.replace(r, "");
};

String.prototype.trim = function (character) {
  return this.trimLeft(character).trimRight(character);
};

'use strict';
String.prototype.trim = function (charlist) {
  return this.ltrim(charlist).rtrim(charlist);
};

String.prototype.trim = function(chars) {
  return this.replace(new RegExp('^[' + (chars || '\\s') + ']+|[' + (chars || '\\s') + ']+$', 'g'), '');
};

String.prototype.trim = function (fag='default'){
  const preg_arr = {'default':/(^\s*)|(\s*$)/,'left':/(^\s*)/,'right':/(\s*$)/};
  switch(fag){
    case 'left':
      return this.replace(preg_arr.left,'');
    break;
    case 'right':
      return this.replace(preg_arr.right,'');
    break;
...

String.prototype.trim = function(str) {
  str = str.replace(/^\s+/,'');
  for( var i = str.length - 1 ; i >= 0 ; i--) {
    if(/\S/.test(str.charAt(i))) {
        str = str.substring(0,i+1);
        break;
  return str;
...