only pass a reference to the function

this is conceptually wrong since the SetTimeout is going to exectue the callback immediately and the function never gets passed in the callback queue. solution, leverage closure and set the database[id] in a global variable. var dataReceived; var data; // is undefined at first function ajaxSimulate(id, callback) { var database = ['Aaron', 'Barbara', 'Chris']; data = database[id] setTimeout(callback, 0); } function storeData() { dataReceived = data;	console.log(dataReceived); } ajaxSimulate(1, storeData);

Author: @leonardofed

2018-01-22-javascript-hard-parts/fem-JavaScriptTheHardParts-AsynchronicitySolutions.js

@@ -150,10 +150,12 @@ console.log('End of Challenge 5');
 //CHALLENGE 6//
 console.log('Start of Challenge 6');
 var dataReceived;
+var data; // is undefined at first
 
 function ajaxSimulate(id, callback) {
  var database = ['Aaron', 'Barbara', 'Chris'];
- setTimeout(callback(database[id]), 0);
+ var data = database[id]
+ setTimeout(callback, 0); 
 }
 
 function storeData(data) {
@@ -242,4 +244,4 @@ function dataHandler(data) {
  $("#ch4").slice(0, -1); //takes off the extra comma
 }
 
-console.log('End of Challenge 9');
+console.log('End of Challenge 9');