Merging Datasets With Duplicates | Dataford Interview Questions

Write a function to merge two datasets while handling duplicates.

Implement merge_datasets(first, second, key) for datasets represented as lists of dictionaries. Records with the same value for key are duplicates, and the record from second replaces the matching record from first. Preserve the order of each key's first appearance, and return a new list without modifying either input.

Signature: def merge_datasets(first, second, key):

Each record contains the specified key, and all key values are hashable. If a key appears multiple times within either dataset, the last record for that key supplies its values.

Constraints

0 <= len(first), len(second) <= 1000
Every record is a dictionary containing the specified key
Key values are hashable
The input lists and dictionaries must not be modified
Duplicate records are resolved with last-write-wins semantics

Function Signature

def merge_datasets(first, second, key):

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