chrome.storage.local.set({list : 'list1'});

function get_list() {

  function x() {
    chrome.storage.local.get(['list'], function (res) {
      return res.list;
    });
  }

  return x() ;

}

alert(get_list());

I have read this .But I didn't find any solution

It works very well if I don't use chrome.storage.local.get function in another function .I am used to write code in PHP that's why I am a bit confusing .Why it returns undefined ? Is it something they call "callback hell" ? Actually I created x function for returning response but then realized I created one function again ,I need to return nested function answer to function answer and then call it . Thanks in advance