Nodejs String Empty Check isEmpty(pattern)

Method Source Code

/**/*from w  w  w  . ja va  2  s .c om*/
 *  String#empty() -> Boolean
 *
 *  Checks if the string is empty.
 *
 *  ##### Example
 *
 *      ''.empty();
 *      //-> true
 *
 *      '  '.empty();
 *      //-> false
**/
String.prototype.isEmpty = function(pattern) {
  return this == '';
};

Related

1. isEmpty()

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

2. 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;
   };
   

3. isEmpty()

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

4. 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;
   };
   

5. isEmpty()

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

6. isEmpty(str)

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

7. isBlank()

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

8. isBlank()

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

9. isBlank()

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