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Session plansPlans Multi-run Walkthrough Point at your appPoint

Goal Order totals match the invoice, to the cent Ready for review

Plan

Find where the discount is rounded
Add a failing test: 3 × $9.95, 15% off
Round once, after the discount
Run the full suite

test/cart.test.ts+4

84 // 3 × $9.95 at 15% off came out a cent high

85 it('rounds once, after the discount', () => {

86 expect(total([tea, tea, tea], 0.15)).toBe(25.37)

87 })

src/cart/total.ts+2 −1

11export function total(lines, off) {

12 return sum(lines.map((l) => net(l, off)))

12 const sub = sum(lines.map(gross))

13 return round(sub * (1 - off))

14}

213 passedTurn 6 · keeps going with the window closed

Fix checkout rounding · 3 runs

Run 11m 12s

Round once, after the discount

export function total(lines, off) {

return sum(lines.map((l) => net(l, off)))

const sub = sum(lines.map(gross))

return round(sub * (1 - off))

}

+2 −1 · 1 file

213 passed

Kept

Run 23m 48s

Keep money in integer cents

export function total(lines, off) {

return sum(lines.map((l) => net(l, off)))

const c = sum(lines.map(cents))

return dollars(c * (1 - off))

}

+41 ~~−27~~ · 6 files

213 passed

Kept

Run 358s

Round half-even on every line

export function total(lines, off) {

return sum(lines.map((l) => net(l, off)))

const each = (l) => netEven(l, off)

return sum(lines.map(each))

}

✕ rounds once, after the discount
expected 25.37, received 25.38

+2 −1 · 1 file

2 failing

Kept

Changes · 3 steps

1total.ts:12Add up the raw prices first.
2total.ts:13Take the discount once, then round. Rounding every line drifted a cent.
3cart.test.ts:86Pin the case that failed: 3 × $9.95, 15% off.

src/cart/total.ts12

1import { gross, net, round, sum } from './money'

2

3// The order total in dollars. `off` is the

4// discount as a fraction: 0.15 is 15% off.

…

11export function total(lines, off) {

12 return sum(lines.map((l) => net(l, off)))

12 const sub = sum(lines.map(gross))

13 return round(sub * (1 - off))

14}

src/cart/total.ts13

11export function total(lines, off) {

12 const sub = sum(lines.map(gross))

13 return round(sub * (1 - off))

14}

15

16// One rounding, at the end:

17// 29.85 × 0.85 = 25.3725 → 25.37

18// Rounding each line first: 3 × 8.46 = 25.38

test/cart.test.ts86

79describe('total', () => {

80 it('applies no discount', () => {

81 expect(total([tea], 0)).toBe(9.95)

82 })

83

84 // 3 × $9.95 at 15% off came out a cent high

85 it('rounds once, after the discount', () => {

86 expect(total([tea, tea, tea], 0.15)).toBe(25.37)

87 })

88})

localhost:5173/checkout

Your order

Assam tea × 3$29.85

Discount 15%−$4.48

Total$25.38OrderTotal

Pay $25.38

OrderTotal · Summary.tsx:24This is a cent out. It should be $25.37.

Found it. Line 12 of total.ts rounds the discount on every line.

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