Nodejs String Empty Check isNullOrEmptyString(obj)

Method Source Code

function isNullOrEmptyString(obj) {
   if (isNullOrUnderdefined(obj))
      return false;
   if (isStringType(obj)) {
      return obj.length == 0;
   }/*from ww  w  .  j a v  a 2 s. co m*/
   return false;
}

Related

1. isNullOrEmpty()

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

2. isNullOrEmpty()

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

3. isNullOrEmpty()

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

4. isNullOrWhitespace()

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

5. isNullOrWhitespace(input)

   String.isNullOrWhitespace = function( input ) {
     return !input || !input.trim();
   };
   

6. isEmpty()

   String.prototype.isEmpty = function() {
     return this == '';
   };
   

7. isEmpty()

   String.prototype.isEmpty = function() {
       return (this.length === 0 || !this.trim());
   };