What we will build using Flutter ListView We discuss recent conceptual and technological advances that allow a better understanding of the transcriptomic and functional heterogeneity of oligodendrocytes (OLs), astrocytes, and microglial cells under inflammatory-demyelinating conditions. Most of the time, dynamic behavior is achieved by changing the contents displayed in the body. T. >. The future must have been obtained earlier, e.g. It is very useful in reading a JSON object as the JSON object represents a set of key-value pairs where key is of type String . type '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of ... (MethodCall) => Null' is not a subtype of type '((MethodCall) => Future ... I/flutter (22805): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════ I/flutter (22805): The following assertion was thrown building ChannelPage2(dirty, state: ChannelPage2State#e8103): I/flutter (22805): type 'Future . 'Future<dynamic>' is not a subtype of type 'bool' or 'Future<String>' is not a subtype of type 'String' etc.. Teams. TypeScript doesn't use "types on the left"-style declarations like int x = 0; Type annotations will always go after the thing being typed.. typing.Union also ignores order when defined, so Union[int, float] == Union[float, int] which can lead to unexpected behaviour when combined with matching based on the Union type order inside other type definitions, such as List and Dict types (because python treats these definitions as singletons). Dynamic Partitions - Android Open Source Project Widget _widgetbuilder () { // code here } The function should be in this structure to return of type Widget. The XM70 with Fibre Channel supports connectivity to Storage Area Networks via Fibre Channel. For example: myFunc().then(processValue).catchError(handleError); The registered callbacks fire based on the following rules: then () 's callback fires if it is invoked on a Future that completes .