Simple caching inside of session storage...

seshCache.js

// session storage caching

define(function() {

    var cacheObj = window.sessionStorage || {
        getItem: function(key) {
            return this[key];
        },
        setItem: function(key, value) {
            this[key] = value;
        }
    };

    return {
        get: function(key) {
            return this.isFresh(key);
        },
        set: function(key, value, minutes) {
            var expDate = new Date();
            expDate.setMinutes(expDate.getMinutes() + (minutes || 0));

            try {
                cacheObj.setItem(key, JSON.stringify({
                    value: value,
                    expires: expDate.getTime()
                }));
            }
            catch(e) { }
        },
        isFresh: function(key) {
            // value or false
            var item;
            try {
                item = JSON.parse(cacheObj.getItem(key));
            }
            catch(e) {}
            if(!item) return false;
            return new Date().getTime() > item.expires ? false : item.value;
        }
     }
});


// Use it
require(['storage'], function(storage) {
    var content = storage.get('sidebarContent');
    if(!content) {
        // request to get content & store for 1 hr
        storage.set('sidebarContent', content, 60); 
    }
});