coolsoftwaretyler · September 12, 2019 21:07 · Sep 12, 2019
diff --git a/gistfile1.txt b/gistfile1.txt
@@ -0,0 +1,19 @@
+doSomeLongRunningTask(function(response, error) {
+  // This function is running as a CALLBACK inside the long task 
+  // So it logs on completion 
+  console.log(response)
+
+  // Return the response
+  return response;
+}
+
+var res = doSomeLongRunningTask(function(response, error) {
+  // You might expect response to get returned and assigned to `res`
+  // But since the task runs long, and you haven't asked to await it, your `res` var gets `undefined`
+  return response;
+}
+
+var res = await doSomeLongRunningTask(function(response, error) {
+  // As long as `doSomeLongRunningTask` is an async function, you can `await` it, and `res` will get assigned at the end of the long task
+  return response;
+}