Unify Technologies Interview Questions and Answers

Find duplicate elements from array

• Iterate through the array and use a hash set to keep track of seen elements

• If an element is already in the set, it is a duplicate

• Return the set of duplicate elements

Higher order component is a function that takes a component and returns a new component with additional functionality.

• HOC is a design pattern in React

• It allows code reuse, logic abstraction and composition

• It can be used for cross-cutting concerns like authentication, logging, etc.

• Example: WithAuth HOC that adds authentication logic to a component

• Example: withRouter HOC that adds routing props to a component