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Problems involving deep traversal and filtering of nested data structures are common in technical interviews. They test recursion, object manipulation, and understanding of tree-like data structures.
The time complexity is O(n), where n is the total number of values across all nested objects and arrays. Each element is visited exactly once during the recursive traversal.
The optimal approach uses recursive depth-first traversal. Each value in the object or array is visited, the predicate function is applied, and valid results are rebuilt into a new structure while empty containers are removed.
Recursion with standard JavaScript objects and arrays works best for this problem. A depth-first traversal naturally handles nested structures and allows you to rebuild filtered arrays or objects at each level.
