Implement Chainable Finder / Selector API

Phone ScreenRobinhoodLast reported August 2026Low Frequency
Reported
2× across candidate reports
First seen
July 2025
Last reported
August 2026
Reported outcome
unknown

Problem Overview

You are given a grid of rectangular blocks (e.g., a 3×3 HTML grid) and an empty class skeleton. Implement a chainable API for selecting and manipulating those blocks. The API must support at minimum: 1. find(idx) / selectById(id) — locate a specific block by index or ID. 2. color(newColor) —…

  • 4 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.
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