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When working with Angular Routing, it’s very useful to be able to respond to routing events – the most obvious and useful being when the route changes. In AngularJS this was accomplished with by attaching a callback function to one the “$routeChange” events on the $scope. In Angular the concept is similar but has some key (and in my opinion, useful) differences.
Once you have a reference to the Router for your application you can subscribe to its “events” observable. This observable will emit a route-event whenever applicable that you can listen for. Being an observable you can subscribe to it in multiple places, filter for the specific event you want, transform the raw event, or anything else you could do with an observable.