An Angular application is composed of components. Each component is connected to the DOM through a root component, which defines a class that contains the application’s data and an HTML template. Each component uses an @Component() decorator to identify itself and provide a template, or other component-specific metadata. The use of decorators is a key part of making an Angular application responsive to user input.
Angular has a component tree that is divided into child components and a root component called the Application. The app component is composed of two files, the first two of which contain the structure and styling of the app. Angular uses import statements and export statements throughout the entire code. The Angular framework is supported by many popular code editors, including Visual Studio Code, Sublime Text, WebStorm, and Angular IDE.
A component’s attributes can be bound to an event or to an element’s data. An example is a button that emits a click event. The button’s event handler must be defined in the component’s class and be called when the button is clicked. An event handler can be a function or member function of the component’s class.
Angular 6 includes the ng update command, which automatically checks for updates to dependencies. This command helps developers to host multiple Angular projects and simplifies migration from one version to the next (more information). The latest Angular versions also include the web workers feature, which allows Angular to be used for multi-threaded applications.
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