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Check out the feedback by the Google interviewer and the full transcript on This is a recording of a mock interview in Java by a senior Google engineer on Interviewing.io offers senior engineers free, anonymous technical interview practice with engineers from Facebook, Google, and more.
This describes the difference between storing data in primitives or in creating an object to store data. The example used is in Java, but it is relevant for many other languages which added Object Oriented principles as it evolved (such as Objective C).