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Problems involving recursive traversal of nested objects or arrays are common in technical interviews. While the exact question may vary, similar tasks testing recursion, object manipulation, and edge-case handling are frequently asked.
The optimal approach is a depth-first traversal of the object or array. By recursively visiting each key or index, you can check for undefined values and replace them with null. This ensures every element is processed exactly once.
The problem primarily works with nested JavaScript objects and arrays. A recursive traversal using the call stack is typically sufficient, though an explicit stack could also be used for an iterative solution.
The time complexity is O(n), where n is the total number of values in the nested structure. Each element is visited once during traversal, making the solution efficient even for deeply nested inputs.