Jadpo is experimental and not ready for production. These docs follow the compiler's main branch as of 1 Nov 2026. What's built · Install 0.2.0
jadpo
Reference: Standard library

Standard types

CountrySubdivision

On this page

A country's subdivision (ISO 3166-2), written as its code, GB-ENG, its variant CountrySubdivision.gb_eng.

Places; not ordered; since Jadpo 0.1.0.

Make one

Pick one of its variants, CountrySubdivision.ad_02.

text.parse(raw, as: CountrySubdivision) reads one from its text; text that isn't one at all fails malformed, such as GB, ENG or GB_ENG.

Variants

5653 variants. Each is its code in lower case, with _ for every other character: CountrySubdivision.ad_02 is written AD-02. The first 40: AD-02, AD-03, AD-04, AD-05, AD-06, AD-07, AD-08, AE-AJ, AE-AZ, AE-DU, AE-FU, AE-RK, AE-SH, AE-UQ, AF-BAL, AF-BAM, AF-BDG, AF-BDS, AF-BGL, AF-DAY, AF-FRA, AF-FYB, AF-GHA, AF-GHO, AF-HEL, AF-HER, AF-JOW, AF-KAB, AF-KAN, AF-KAP, AF-KDZ, AF-KHO, AF-KNR, AF-LAG, AF-LOG, AF-NAN, AF-NIM, AF-NUR, AF-PAN, AF-PAR.

Text, JSON and storage

text.from writes its canonical text, the one form text.parse reads back. JSON sends its canonical text as a string.

Text JSON
GB-ENG "GB-ENG"
JP-13 "JP-13"
US-CA "US-CA"

It is stored in one column named for the field, of type text. JP-13 is stored as 'JP-13'.

Shown to people

text.format(value, locale:) shows it to people in their locale.

With locale: Locale.en_gb:

Value Shown
GB-ENG England
JP-13 Tokyo
US-CA California

Operations

It has the contract's own operations: text.parse, text.from, text.format, json.read, json.write and ==. It isn't ordered, so < and sorting don't take it. Every standard type meets one contract says how they work.

Markdown for agents: /docs/types/type-country-subdivision.md.Built from Jadpo main at e00e61f.