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How do I create a PDF file with graphs/charts using Angular 2?

The Observer pattern is awesome! The observer pattern has been around for decades and was first “officially” defined by the gang of four in their seminal book. Design Patterns. Elements of Reusable Object-Oriented Software. This is one of the first books for discovering tried and proven design patterns (development abstractions). Any developer looking for a challenge, development insight, or just trying to reach the next level, would do well to become familiar with the design patterns in this book (even if it’s not written specifically for the language you write in). The observables in Angular are based off of the the Observer pattern. Observer pattern - Wikipedia. The observer pattern has been the Controller in just about any MVC framework worth its salt. The observer pattern works like a little application within your application, a subject can be set-up for any kind of state change and observers can subscribe to be notified whenever there is a state change of the subject. The observer pattern is most commonly used in OOP and often in an MVC framework (and is one of the few exceptions to the inheritance is evil principle). What’s interesting about Angular/rxJS’s observer is that it’s being used to convey the state changes of the service’s source. Observers have less overhead then recursively polling something for a state change and unlike a promise can repeatedly express state changes, this makes them an ideal construct for handling data source updates in Angular.

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The observer pattern has been around for over two decades and has been heavily used on the Web, in Java/J2EE and other programming languages. React The Observer pattern provides a very simple abstraction to the state of your system. It makes it extremely easy to handle both the asynchronous and synchronous events that affect your system. If you have a function that needs to be called when the state of the state changes, and you don't want to poll for the new state from your database every time you want to trigger that function, the observer pattern makes that very easy for you. In this tutorial we’ve been working with the Redux library. This library is a super lightweight library that can run in the browser as well as in Node.js. We’ve been using React with Redux since we’ve been developing some new libraries like a library for generating HTML5.

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