Nodejs String Empty Check isEmpty(str)

Method Source Code

String.isEmpty = function(str){
    if(typeof str === 'string'){
        str = str.trim();/*www  .  j  a  va  2 s  . c om*/
    }

    switch(str){
        case "":
        case 0:
        case null:
        case false:
        case undefined:
            return true;
        default:
            return false;
    }
};

Related

1. 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;
   };
   

2. isEmpty()

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

3. 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;
   };
   

4. isEmpty()

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

5. isEmpty(pattern)

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

6. isBlank()

   String.prototype.isBlank = function() { 
     return !this.match(/\S/) 
   

7. isBlank()

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

8. isBlank()

   String.prototype.isBlank = function() {
       return (this==null || this=="");
   

9. isBlank()

   String.prototype.isBlank = function (){
     var str = $.trim(this);
     if(str == "") {
       return true;
     } else {
       return false;