String.prototype.trim

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.lpad = function(padString, length) {
  var str = this;
  while(str.length < length) {
    str = padString + str
  }
  return str
};
String.prototype.rpad = function(padString, length) {
  var str = this;
  while(str.length < length) {
    str = str + padString
  }
  return str
};
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