REPL Driven Development, Scrum, and the Wright Brothers
summary
Argues that REPL-driven development plus small, single-focused iterations beats heavy up‑front work, demonstrating a working stock‑analysis bot built in F# inside Visual Studio that pulls CSV history from Yahoo, plots a chart, and uses Accord regression to predict next‑day price. Iteration counts and metrics are concrete: Wright brothers run ~250 flights to refine control, regression R² climbs from ~0.05 to ~0.54 and RMSE drops to ~$0.41 using a 20‑day window. The F# REPL code is compiled, unit tested and wired into a Bot Framework endpoint that returns current and predicted prices.
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chapters (12)
- 0:00Start
- 8:13Need A Small Team
- 9:42One Thing At A Time
- 11:42Incremental Small Changes
- 13:30Challenge Everything
- 14:02Evolve The Design
- 15:06What Does This Have to Do With Writing Software?
- 41:21Fail Fast and Early
- 42:18Stop Context Switching
- 47:39Why Unit Tests?
- 48:03Remove the Noise & Clutter
- 52:05Questions?
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