Prepare for tech interviews and develop your coding skills with our hands-on programming lessons. Become a strong tech candidate online using Codility!. It was on codility and consisted of two questions: This was just a simple JavaScript question. It was if you are given a string representing a day of the week, like “Tue”, and a number of days after that day, like 2, return the day of the week that results from the number of days after the given day. So in the example, you would return “Thu”.