typescript code snippets 06

interface MyCustomTypeA {
  test: string;
}

interface MyCustomTypeB {
  anything: boolean;
}

interface ReusableInterface3<T> {
  entity: T;
}
const ri3a: ReusableInterface3<MyCustomTypeA> = { entity: { test: "yes" } };
const ri3b: ReusableInterface3<MyCustomTypeB> = { entity: { anything: true } };
const ri3c: ReusableInterface3<number> = { entity: 1 };


class MyClass4<T> {
  // Class
  list: T[] = [];
  public displayFirst(): void {
    const first: T = this.list[0]; // Variable
    console.log(first);
  }
}
// read it
function extractFirstElement<T, R>(list: T[], param2: R): T {
  console.log(param2);
  return list[0];
}
// extending genrics types
interface AnyKindOfObject {
  what: string;
}

interface ReusableInterface3<T extends object> {
  entity: T;
}

const d: ReusableInterface3<AnyKindOfObject> = { entity: a };
console.log(d.entity.what); // Compile