Nodejs String Empty Check isEmpty()

Method Source Code

/**//  ww w.  jav  a2s. c  o m
* adding isEmpy() function to the String class.
* checks whether a string is empty or contains only whitespace.
*/
String.prototype.isEmpty = function() {
    return (this.length === 0 || !this.trim());
};

Related

1. isEmpty()

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

2. isEmpty()

   String.prototype.isEmpty = function () {
     return (!this || this == "[object Null]" || this == "" || this == "undefined");
   

3. isEmpty()

   String.prototype.isEmpty = function() {
     return this.trim() === "";
   

4. isEmpty()

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

5. isEmpty()

   String.prototype.isEmpty = function() {
      return (this.length === 0 || !this.trim());
   Array.prototype.appendStringToElementAtIndex = function(index, str) {
       if(typeof this[index] === 'undefined' || typeof this[index] !== 'string') return false;
       this[index] += ' ' + str;
   };
   

6. isEmpty()

   String.prototype.isEmpty = function(){
       if(typeof this !== 'string') {
           if(typeof this === 'object' && !(this instanceof String)){
               throw {
                   name: 'InvalidType',
                   message: 'The current type is not a String'
       return this.length === 0;
   };
   

7. isEmpty()

   String.prototype.isEmpty = function() {
     var rtn = (this == null || this == undefined || this.trim() == '');
     return rtn;
   };
   

8. isEmpty(pattern)

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

9. isEmpty(str)

   String.isEmpty = function(str){
       if(typeof str === 'string'){
           str = str.trim();
       switch(str){
           case "":
           case 0:
           case null:
           case false:
   ...