Urban Company Interview Questions and Answers

To switch between tabs in a browser using Selenium, we can use the getWindowHandles() method and switchTo() method.

• Use getWindowHandles() method to get the handles of all open tabs

• Store the handles in a Set

• Use switchTo() method to switch to a specific tab by passing the handle as an argument

Count the number of repeated integers in an array

• Iterate through the array and use a hash table to keep track of the count of each number

• Return the count of numbers with a count greater than 1

Code to give rating in webtable for given applicant name and rating as input.

• Create a function that takes applicant name and rating as input.

• Search for the applicant name in the webtable.

• Update the rating for the applicant in the webtable.

• Return the updated webtable.

I faced a technical challenge while implementing a complex algorithm for real-time data processing.

• Identified the bottleneck in the algorithm by profiling the code

• Optimized the algorithm by implementing data structures and algorithms with lower time complexity

• Tested the optimized solution thoroughly to ensure correctness and performance

• Collaborated with team members to brainstorm alternative approaches

Event loop in Node.js manages asynchronous operations by executing callback functions when certain events occur.

• Node.js uses a single-threaded event loop architecture to handle multiple concurrent operations.

• Event loop continuously checks the call stack for any functions to execute, along with handling I/O operations asynchronously.

• Concurrency in Node.js is achieved through non-blocking I/O operations, allowing multiple tasks to be executed simultaneously.

• Example: When a file...read more