Leveraging on_mount in Phoenix LiveView to Streamline Code

In the world of Phoenix LiveView, one of the key features introduced is the on_mount/1 callback. This callback function is executed before the mount/3 function takes over in a LiveView module. The article explains that on_mount can be added in two distinct ways: either globally in the router by using the live_session/3 declaration or locally in individual LiveView modules by applying an on_mount/1 macro. Herminio Torres illustrates how on_mount/1 can help eliminate repetitive pre-mount logic across different LiveViews, thereby rendering the code more DRY (Don't Repeat Yourself). Examples are provided to demonstrate how authentication hooks can be abstracted using this feature, enabling more organized and manageable code structures.