Developer Uses AI-Generated JavaScript to Validate Swift App Game Rules Before Coding

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A solo developer working on ToneDrill, a guitar practice iOS app, has begun building a new feature called Chord Tone Practice, which challenges players to locate chord-tone patterns on a guitar fretboard. Before writing any SwiftUI code, the developer used Codex to generate a JavaScript validation script that tested 504 combinations of root notes, chord qualities, patterns, and fret ranges. The script confirmed there were no dead-end scenarios, overlapping answers, or conditions with zero valid solutions. This cross-language validation approach — using JavaScript to pre-test rules for a Swift app — was a new workflow for the developer. With the core game logic now verified, the next phase will focus on building the user interface in SwiftUI.

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