Union types, denoted by the|operator, allow theVehicletype to be either aCaror aBike. Each type has a distinguishingtypeproperty and its own unique properties (wheelsforCar,pedalsforBike). In this case, thevehicleobject conforms to theCartype, and TypeScript ensures it matches one of the all...
Generally speaking, TypeScript determines the type of a variable when it is declared. This determined type stays the same throughout our application. There are exceptions to this rule, such as when considering type narrowing or working with theanytype, but otherwise, this is a general rule to ...
The actual property can still be the primitive type (string[],Array<string>, butString[]would work too). classElementextendsJSONObject{@optionalx?:number}classArrayTestextendsJSONObject{@required@array(Element)a:Array<Element>@optional@array(String)b:string[]}letjson={a:[{x:2},{}],b:['F...
TypeScript 複製 function eventNames(): (string | symbol)[] Returns (string | symbol)[] Inherited From DataObject.eventNamesfinishInitialization(boolean) Call this API to ensure PureDataObject is fully initialized. Initialization happens on demand, only on as-needed bases. In most cases you ...
Initialization of Data forobject-list Allobject-listvariations (see below) use aDB queryorarrayto determine which objects to display. main.view.xml <varname="all_items"type="query:item"/><!-- OR --><varname="all_items_array"type="array:item"/> ...
I am not sure, if it has changed in newer typescript versions - mine is 3.1.6 -, but this does not compile (regardless if strict or not compiler options): class MyClass implements MyInterface { a: string; b: number; constructor(i: MyInterface) { Object.assign(this, i); } } inter...
This method should be removed if script priority is supported. metadescription Defined in cocos2d/core/components/CCComponent.js:244 onLoad When attaching to an active node or its node first activated. onLoad is always called before any start functions, this allows you to order initialization of ...
Type void (static)ensureClassInitialization(clazz): {void} Ensures that a class is initialized. Although class initialization occurs by default the first time that an instance of a class is created, classes that use static factory methods to create their instances may still need to ensure that ...
This type of dependency injection consists in passing the dependency through a property. It allows a lazy loading initialization of the dependency, in case the dependency is not instantiated when main component is instantiated. Further more, it makes the code less coupled, since the constructor of...
In the index.ts file we need to add getOutputSchema method to provide the output object schema. When the control is added to a Canvas App, the platform will call to this method prior to control initialization to receive the output object(s) schema(s). TypeScript 复制 public async get...