sessionstorage works but returns "undefined" in console. why?

Question

I just build a jquery plugin to handle some data storages. when i try to read from storage, the result is the read item data. fine for now....

when i add

sessionStorage.setItem('test','some data');

or remove

sessionStorage.removeItem('test');

a item, i allways get a undefined in the console.log

but it do what i it should do.

how can i get rid of the undefined, any ideas ???

what i tried was

var result = sessionStorage.setItem('test','some data');

thought this would print it to a var but it won't ^^

my code:

(function ($) {

    $.storage = {

        add: function(name,value){

            if(typeof value === 'object' )
            {   
                /** convert object to json **/
                value = JSON.stringify(value);
            }
            /** add to storage **/
            sessionStorage.setItem(name,value);
        },

        read: function(name){

            /** read from storage **/
            var item = sessionStorage.getItem(name);
                try {
                    item = $.parseJSON(item);
                }catch(e){}
            return item;
        },

        remove: function(name){
            /** delete from storage **/
            sessionStorage.removeItem(name);
        },

        clear: function(){
            /** clear storage **/
            sessionStorage.clear();
        }

    }
})(jQuery);

SOLUTION

I tried to add storage in console... when i used it in my script it returned nothing! SORRY

Answer 1

setItem and removeItem doesn't return any value. Thus you are getting undefined. Also note removeItem only accept one parameter.

Reference, Here is function sign for above methods

setItem(key:string, data:string):void

This public method stores data via specified key. Please note that if key was already stored, it will overwrite it. Another thing to consider is that if we store a key, and via sessionStorage.key(0) we obtain that key, then we store another key/data and finally we store again the first key, sessionStorage.key(0) will return the second key/data stored, and not the first one.

removeItem(key:string):void

This public method simply removes a key and related data from the storage.

Answer 2

var result = sessionStorage.setItem('test','some data');

does not return anything.

sessionStorage.setItem('test','some data');

assigns value to 'test'therefore the right hand side does not have any value. What you want is

sessionStorage.setItem('test','some data');
var result = sessionStorage.getItem('test'); //<- here the right hand side is 'some data'