Consistency means that similar endpoints should behave in similar ways, including in edge scenarios. You should always strive to keep vocabulary, URL structure, request/response formats and error handling consistent across your entire API.
…ns, or the HTTP request finishes getting its data from its source, or a timer reaches its set time. In each instance, once an action is triggered, a ‘callback function’ is sent to the fourth and final container, the ‘callback queue.’
Note - the Stack is a data structure that runs LIFO — last in first out. No function other than the one at the top of the stack will ever be in focus, and the engine will not move to the next function unless the one above it is popped off.