Having a favorite programming language tells a lot about the experience and expertise level of a software developer. There are numerous languages to pick from, and depending on what applications you are working on, and what you are intending to achieve, some might work better than others. A hiring manager at Salesforce might start with a question about what your favorite language is, and then move to your approach and possibly your methodology or reasoning for favoring that language. Your pre-interview research should tell you what languages the developers at Salesforce use, which can help you structure your answer. Let me give an example of how this question might be answered. If we intend to use Java for this example, we would look at the LRU cache and recently used entries, then remove the element from the bottom and add an element to the start of a LinkedList and wherever any entry is accessed, it is moved to the top so that recently used entries will reside at the top, and the least used entries will reside on the bottom.