Given the Java code snippet above, how would you achieve the same functionality in TypeScript as ParentClass.this.a?
class ParentClass{
a: number = 1;
class ChildrenClass{
b: number = 2;
run(){
this.b = parentInstance.a; // Assuming 'parentInstance' is an instance of the ParentClass
}
}
}
I am trying to access the parent's variable while inside a callback function.
In the world of typescript/javascript, the idea of nested classes is not officially supported. Attempting to define a class within another class directly is not a valid syntax in typescript.
One workaround is to utilize declaration merging by combining a namespace and a class. This way, you can create a sort of nested class within the parent class scope. Here's an example:
class ParentClass {
a = 1;
childClass: ParentClass.ChildrenClass;
constructor() {
this.childClass = new ParentClass.ChildrenClass(this);
}
}
namespace ParentClass {
export class ChildrenClass {
constructor(private parentClassThis: ParentClass){}
b = 2;
run(): void {
this.b = this.parentClassThis.a;
}
}
}
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