Intersect chosen parts

All selected parts must match

import { kanjiForRadicals, usableRadicals, orderChosen } from "@johnmorrisdotca/bushu";
import { RADKFILE } from "@johnmorrisdotca/bushu/radkfile";
const chosen=orderChosen(RADKFILE.radicals,["田","汁"]);
console.log(chosen,kanjiForRadicals(RADKFILE.radicals,chosen));
console.log(usableRadicals(RADKFILE.radicals,chosen).has("汁"));

[ '汁', '田' ] [
  '演', '浬', '漁', '滝',
  '薄', '藩', '簿', '油',
  '湧', '溜', '沺', '渭',
  '溥', '潘', '澑', '瀋',
  '濾', '瀘', '瀾', '鯊'
]
true

The pure search intersects selected keys. Nothing selected returns [], and a key absent from the supplied index also returns []. Result order follows the first matching radical in the supplied index. orderChosen follows the grid’s native order rather than click order and drops unknown keys.

Keep removal available

usableRadicals returns the parts that can occur in a current match and keeps chosen parts in the set, even when there are no matches. A picker can always remove a choice. With no choices, all supplied parts are usable. radicalsInKanji lists a character’s indexed parts by strokes, breaking ties by code point rather than locale collation.