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Responsible Design Patterns for Gambling-Related Calculator Tools

Developers build calculators for all kinds of regulated or risky domains: loans, crypto, insurance, betting. The code is usually the easy part.

  • Clearly state calculator's purpose and what it's not for
  • Prioritize showing required turnover and expected cost upfront
  • Make time visible by converting requirements into number of bets

# Windows Found My Bug Before I Did. I Just Had to Read the Error Message.

Sometimes, the hardest part of debugging isn't finding the bug. It's actually paying attention to what the error message is telling you.

  • Java's substring method includes starting index but excludes ending index
  • Off-by-one error caused '=' to be included in extracted value
  • Windows error message pinpointed the substring indexing issue

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