Lazily loading a library

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Deferred loading (also called lazy loading) allows an application to load a library on demand, if and when it’s needed. To lazily load a library, you must first import it using deferred as.

import 'package:deferred/hello.dart' deferred as hello;

When you need the library, invoke loadLibrary() using the library’s identifier.

greet() async {
  await hello.loadLibrary();

In the preceding code, the await keyword pauses execution until the library is loaded. For more information about async and await, see more examples here asynchrony support or visit the asynchrony support part of the language tour.

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