Improved semantics of the directives syntax
In Chapter 1, Get Going with Angular, we mentioned the opportunity for improved tooling in Angular. A big issue in AngularJS is the different ways in which we can use directives. This requires an understanding of the attribute values, which can be literals, expressions, callbacks, or a microsyntax. Starting with Angular 2, this problem is eliminated by introducing a few simple conventions that are built into the framework:
propertyName="value"[propertyName]="expression"(eventName)="handler()"
In the first line, the propertyName attribute accepts a string literal as a value. Angular will not process the attribute's value any further; it will use it the way it is set in the template.
The second syntax, ...
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