Implement a Data Class With Features | Dataford Interview Questions

Here is some data - create a class for it and implement a few features on top of it.

Asked in the first round technical stage. The one-hour interview was described as creating a class and implementing a few features with data provided, rather than solving a LeetCode problem.

Implement DataCollection for records represented as dictionaries with a unique id. Support adding records, removing by ID, filtering by an exact field value, sorting by a field, and counting records by a field. The helper run_operations(records, operations) must return one result per operation.

Contract

records is a list of dictionaries.
Operations are dictionaries using add, remove, filter, sort, or count.
Return records as dictionaries, booleans for removal, lists for filtering and sorting, and dictionaries for counts.
Preserve insertion order when filtering and stable ordering for equal sort keys.

Constraints

0 <= len(records) <= 10^4
0 <= len(operations) <= 10^4
Every record contains a unique integer or string id
Referenced fields exist for sort and count operations
An add operation does not replace an existing ID
Filtering uses exact equality

Function Signature

def run_operations(records, operations):

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