Imagine a file with endless list of URLs. For each URL check if it contains an image. If it does, identify the top 6 colors and store it memory so it can be printed/stored later.

In something like python this can be as short as 20 lines of code: - open the file - read line by line - validate if the URL is valid - call the URL - check if it's image - if image, read pixel by pixel and check the color - store it in dictionary/hashmap

Here is what I look for: - does it compile/work? - what language did you choose? (like python is fast to write this in few lines but hard to introduce concurrency) - have you introduced some kind of caching for the URLs? (so you don't waste resources) - are you checking if the URL is valid or you just run them all and wait for errors/timeouts? - are you checking the file type from HTTP header or body of the file? - how do you handle errors? - are you attempting concurrency? If yes, how?

I actually done this exercise myself in dozen or so languages to see what choices I make based on the language. Obviously one can spend significantly more time on it if they really desire, but the design choices are visible from the beginning.