Instruction: Write a function that creates a deep copy of an object, including nested objects.
Context: This question assesses the candidate's ability to work with objects and their understanding of reference vs. value in JavaScript.
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To begin, it's crucial to understand the difference between shallow and deep copying. A shallow copy duplicates an object's top-level properties, but nested objects are copied as references. In contrast, a deep copy duplicates every level of the object, ensuring that nested objects are also independently copied. This distinction is vital for avoiding bugs related to mutable objects.
```javascript function deepCopy(obj) { // Check if the input is an object or null (typeof null also returns 'object') if (typeof obj !== 'object' || obj === null) { return obj; // Return the value if obj is not an object }...