Nodejs String Empty Check isEmpty()

Method Source Code

// Where to put utility?
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;
};

Related

1. isEmpty()

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

2. isEmpty()

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

3. isEmpty()

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

4. isEmpty()

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

5. isEmpty()

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

6. isEmpty()

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

7. 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;
   };
   

8. isEmpty()

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

9. isEmpty(pattern)

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