Software Engineer

It was basically a question of Topological Sorting and I used Kahn's Algo to implement the same. 

I used code sandbox and created a react template. Used functional components and react hooks like useEffect and useState to get the work done.

When a component's props or state change, React decides whether an actual DOM update is necessary by comparing the newly returned element with the previously rendered one. When they are not equal, React will update the DOM. This process is called reconciliation.

Stateless Components : If the behaviour is independent of its state then it can be a stateless component. You can use either a function or a class for creating stateless components. But unless you need to use a lifecycle hook in your components, you should go for function components.

Stateful Components : If the behaviour of a component is dependent on the state of the component then it can be termed as stateful component. These stateful components are always class components and have a state that gets initialized in the constructor.

Tip 1 : Be honest
Tip 2 : Read the description of the role and be thorough about your understanding of the company and their vision
Tip 3 : Listen properly to what they are saying, show eagerness and enthusiasm to be part of their organisation.