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The ng-repeat directive in Angular 1.x allows us to iterate over a collection of data and print out DOM nodes that respond to that data. If the data changes, the DOM changes as well. In this guide we'll be converting an Angular 1.x ng-repeat directive across to Angular 2's ngFor directive.
Dependency injection is an important application design pattern. Angular has its own dependency injection framework, and you really can’t build an Angular application without it.