Nodejs String Empty Check isNullOrEmpty()

Method Source Code

String.prototype.isNullOrEmpty = function() {
  return (!this || 0 === this.length || /^\s*$/.test(this));  
};

Related

1. isNullOrEmpty()

   String.prototype.isNullOrEmpty = function(){
       return !(this && this.length > 0);
   };
   

2. isNullOrEmpty()

   String.prototype.isNullOrEmpty = function () {
     return this === null || this.length === 0;
   };
   

3. isNullOrEmptyString(obj)

   function isNullOrEmptyString(obj) {
     if (isNullOrUnderdefined(obj))
       return false;
     if (isStringType(obj)) {
       return obj.length == 0;
     return false;
   

4. isNullOrWhitespace()

   String.prototype.isNullOrWhitespace = function () {
     return this === null || this.replace(/\s/g, '').length === 0;
   };