Scenario applications

Nine kinds of application Jadpo is meant for, what each does, and the operations it uses. Use these tables to find the operation for a job; each operation is described in its section of this page, or on the page linked beside it.

1. Online shop

Does	Needs
Basket total and a 10% discount	`money.sum`, `total * 90%`
Discount spread across the lines for the receipt	`money.allocate`
Product page address from its title	`text.slug`
Order reference read out on the phone	`random.code`
Products by price, highest first	`list.sort_by`, `list.reverse`; `order:` in a query
Product feed for a marketplace	`csv.write`
Image cache key	`hash.sha256`, `encoding.to_hex`

2. Appointment bookings

Does	Needs
Slots in the clinic's zone	`temporal.resolve`, `temporal.day_bounds`
Free slots: all slots without booked ones	`set.difference`
Earliest free slot	`list.min_by`
Cancel link in the confirmation email	`random.token`, `encoding.to_url_component`
Reminder a day before	`temporal.add_days`
A booking ends after it starts	A rule across fields (Rules across fields)
Calendar invite file	`.ics` package

3. Delivery and logistics

Does	Needs
Driver's next stop and the rest	`list.first`, `list.drop_first`
Estimated arrival	`Instant + Duration` (Arithmetic and comparison)
Is the address inside the zone, distance to depot	Geospatial
Tracking code	`random.code`
Carrier manifest import	`csv.read`
Proof-of-delivery photo fingerprint	`hash.sha256`
Parcels by weight band	`list.group_by`

4. Property listings

Does	Needs
Asking price shown in the visitor's locale	`text.format`
Price per square metre	`price / units.in(floor_area, AreaUnit.square_metre, ...)`: `Money` by a `Decimal`
Listing address	`text.slug`
Description preview	`text.trim`, `text.keep_first`
Features filter	`set.contains`, `set.intersection`
Map search in the visible area	Geospatial
Portal feed import	`json.read` as a batch

5. SaaS with subscriptions and billing

Does	Needs
Plan prices per customer's currency	`Money` with a currency known while running
Proration for a mid-month change	`price * (days_left / days_in_month)`, the type's rounding
Invoice total of lines	`money.sum`
Signed webhooks to customers	`crypto.hmac`, `json.write`
Customers' third-party tokens kept safe	`crypto.encrypt`, encrypted fields
Features per plan	`set.contains`
Usage per day	`map.get`, `map.with`; monthly totals by an aggregate query (Counts, sums and groups)

6. CMS with CSV imports and exports

Does	Needs
Import articles from a spreadsheet	`csv.read`, construction per row
Export for editors	`csv.write` with `CsvFormat.spreadsheet`
Tags typed by hand, tidied	`text.trim`, `text.lower`, `set.with`
Excerpt and word count	`text.keep_first`, `text.split`, `list.filter`, `list.count`
Articles in a locale's alphabetical order	`list.sort_by` with `locale:`
Rich text kept safe	`Html`, made safe by its construction

7. IoT telemetry

Does	Needs
Readings arriving in bulk	`json_lines.read`
Average, spread and extremes per window	`list.sum`, `decimal.divide`, `decimal.sqrt`, `list.min_by`, `list.max_by`
Drop repeated messages	`set.contains`, `list.distinct`
Latest reading per device	`list.group_by`, `list.last`
Hourly charts over months	Aggregate queries (Counts, sums and groups)
Each device signs its messages with its own key	Keys held as data (see What is built)
Bit-packed payloads	The device's provider package (Logic and bits)

8. Internal admin tool

Does	Needs
Bulk actions on selected records	`Set<Uuid>`, `set.difference`
Email shown masked	`text.keep_first`, `text.keep_last`
Export of a filtered list	`csv.write`
A record's raw JSON for support	`json.write`
Counts by status	Aggregate queries (Counts, sums and groups)
Roles	`set.contains`
Two-factor codes	TOTP package; passkeys or a provider (Ways to sign in)

9. Support assistant with retrieval (AI)

Does	Needs
Embed help articles and find the closest	`Vector`, pgvector query (Embeddings and search)
Answer as a typed reply with sources	`ai.generate(..., as:)` (Typed output)
Show the answer as it is written	`ai.stream` (Streaming)
Keep within a monthly budget	AI limits (Budgets)
Strip personal data before sending	`text.replace`; the personal-data report
Chunk articles into passages	`text.split`, `list.keep_first`

How much of the standard library each application uses, and how each need was met, is in the design notes.

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