Callbacks, setTimeout, & the Event Loop
Explore how JavaScript executes asynchronous code using callbacks and setTimeout functions. Understand the event loop mechanism to manage tasks scheduled for future execution. This lesson equips you to handle events like button clicks and delayed actions effectively.
We'll cover the following...
What Callbacks Do
Callbacks are absolutely vital to asynchronous programming. The only way for us to tell JavaScript to do something in the future is to provide a callback that will be invoked later.
JavaScript allows us to attach a callback to a particular event. We can tell JavaScript that when some event happens, we want to run some function. That’s the gist of the whole concept.
The event can be anything. In a browser, it can be a button click from a user. On a file system, it can be a file read operation. We can attach handlers to these events, saying that every time this event happens, we want something else to ...