Dataset Join

OAStripeLast reported April 2026Low Frequency

Reported: 3× across candidate reports
First seen: March 2026
Last reported: April 2026
Reported outcome: mixed

Problem Overview

Implement a function joinDataSet(fieldName, customerFile, processorFile, skipUnmatched) that merges two CSV-like datasets. Inputs: - fieldName (String): the column name to join on (guaranteed to exist in both file headers) - customerFile (List<String>): first row is a header, subsequent rows are data; columns are comma-separated - processorFile (List<String>): same format as…

3 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
The rest of the problem statement — full requirements, constraints, and edge cases
Approach and trade-offs — what passing candidates did, and the mistakes that sink people

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Verified Source

Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.

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Interviewer Follow-ups

The exact follow-ups reported by candidates, with the trigger that prompts each one — plus the mistakes that sink people.