Pregunta de entrevista de Siemens Healthineers

If we want to use ngIf and ngFor at same time what are the options ? Web workers web components Pseudo elements pseudo classes Unit testing was stressed a lot - he asked me to write a unit test for one function Coding questions on closure and self invoking functions . Few array manipulation questions Angular Observables , Subject (types of Subject), Promises, Auth guards , routing objects, Dependency injection (Everything with example)