Parse JSON Records and Fraud Flag | Dataford Interview Questions

Debug and complete a partially implemented class that parses JSON-format records (loan id, ticket id, status) and determines, from tickets and their statuses, whether something is fraudulent; implement missing methods and fix broken logic such as sorting by a specific field.

Asked in the technical screen stage. Existing code has missing pieces and broken logic, and must produce the expected output.

Implement detect_fraudulent_loans(records). records is a list of JSON strings, each containing loan_id, ticket_id, and status. A loan is fraudulent if any associated ticket has status "fraudulent". Return a list of objects with loan_id and boolean fraudulent, sorted lexicographically by loan_id.

Example: ['{"loan_id":"L2","ticket_id":"T1","status":"clear"}', '{"loan_id":"L1","ticket_id":"T2","status":"fraudulent"}'] returns [{'loan_id':'L1','fraudulent':True},{'loan_id':'L2','fraudulent':False}].

Constraints

0 <= records.length <= 10^5
Each record is a valid JSON object
Each record contains string fields loan_id, ticket_id, and status
status is either "clear" or "fraudulent"
loan_id and ticket_id are non-empty strings

Function Signature

def detect_fraudulent_loans(records):

Your question is Parse JSON Records and Fraud Flag. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

Asked in the technical screen stage. Existing code has missing pieces and broken logic, and must produce the expected output.

Constraints

0 <= records.length <= 10^5
Each record is a valid JSON object
Each record contains string fields loan_id, ticket_id, and status
status is either "clear" or "fraudulent"
loan_id and ticket_id are non-empty strings

Function Signature

def detect_fraudulent_loans(records):

Your question is Parse JSON Records and Fraud Flag. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.