grokbot_ty
55d66b9644
Pure units module: bdft = sqft × thickness_in (no /12), half-up rounding for sqft/bdft/price, length to nearest 1/8". Property checks for monotonicity in thickness and sqft. TDD: red evidence in test-results/tv3-tv10-red.txt, then minimum impl. Results: TV-3 | pass | test-results/tv3-tv10-green.txt TV-10 | pass | test-results/tv3-tv10-green.txt
40 lines
1.0 KiB
TypeScript
40 lines
1.0 KiB
TypeScript
import {
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AREA_DECIMALS,
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BDFT_DECIMALS,
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INCH_STEP,
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PRICE_DECIMALS,
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} from "./constants.js";
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/** Half-up at .5 (away from zero). */
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export function roundHalfUp(value: number, decimals: number): number {
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if (!Number.isFinite(value)) {
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return value;
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}
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const factor = 10 ** decimals;
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const scaled = Math.abs(value) * factor;
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const rounded = Math.floor(scaled + 0.5) / factor;
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return value < 0 ? -rounded : rounded;
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}
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/** Nearest INCH_STEP (1/8"). */
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export function roundLengthIn(lengthIn: number): number {
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return Math.round(lengthIn / INCH_STEP) * INCH_STEP;
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}
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export function roundSqft(sqft: number): number {
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return roundHalfUp(sqft, AREA_DECIMALS);
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}
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export function roundBdft(bdft: number): number {
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return roundHalfUp(bdft, BDFT_DECIMALS);
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}
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export function roundPrice(price: number): number {
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return roundHalfUp(price, PRICE_DECIMALS);
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}
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/** bdft = sqft × thickness_in. No divide-by-12. */
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export function computeBdft(sqft: number, thicknessIn: number): number {
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return roundBdft(sqft * thicknessIn);
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}
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