A friend asked me to explain this code in detail for a function called updateRecords() that they were studying on an online learning site. Actually they expect you to create the guts of the function yourself and make sure it meets certain requirements. This is my solution and explanation. It is designed for somewhat beginners so Its deliberately not succinct because the purpose is to explain whats going on in detail in a simple way that is easy to follow. At the end I will demonstrate alternative ways to write the same function in a more concise manner.
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