tscircuit / tscircuit/math-utils
range() with a fractional step emits an extra element past the exclusive end
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- TypeScript
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Description
range(0, 1, 0.1) returns 11 elements instead of 10 — the loop accumulates i += step, so float drift lands the last value at ~0.9999999999999999, which slips under the exclusive end 1.0 and gets pushed. range(0, 3, 0.3) has the same off-by-one (11 vs 10). Integer steps are fine. Computing each element as start + k * step (with k < ceil((end - start) / step)) avoids the drift. Repro + fix PRs to follow.
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Research direction
Start at the TypeScript implementation of range() and reproduce the fractional-step cases from the issue, including range(0, 1, 0.1) and range(0, 3, 0.3). Add regression coverage for the exclusive-end behavior and verify that fractional ranges no longer emit an extra element while integer steps remain unchanged.
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Assessment
- Tech stack
- typescript
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 72/100