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add purely functional Trie

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Joeri Exelmans 2025-05-10 02:03:41 +02:00
parent c3dc16b328
commit c27c7d3648
2 changed files with 193 additions and 0 deletions
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tests/trie.js Normal file
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import { pretty } from "../lib/util/pretty.js";
import { insert, emptyTrie, growKey, suggest } from "../lib/util/trie.js";
// insertion
const with1Item = insert(emptyTrie)('abba')('dancing queen');
console.log(pretty(with1Item));
const with2Items = insert(with1Item)('aboriginal')('australia');
console.log(pretty(with2Items));
const with3Items = insert(with2Items)('food')('pizza');
console.log(pretty(with3Items));
const with4Items = insert(with3Items)('absent')('not here');
console.log(pretty(with4Items));
const with5Items = insert(with4Items)('000')('000');
console.log(pretty(with5Items));
const with6Items = insert(with5Items)('aboriginally')('??');
console.log(pretty(with6Items));
const with7Items = insert(with6Items)('ab')('yup');
console.log(pretty(with7Items));
const with8Items = insert(with7Items)('')('hi!');
console.log(pretty(with8Items));
// grow key (for auto-complete)
console.log(growKey(with6Items)("a")); // b
console.log(growKey(with6Items)("ab")); // (empty string)
console.log(growKey(with6Items)("abb")); // a
console.log(growKey(with6Items)("f")); // ood
console.log(growKey(with6Items)("abo")); // riginal
// suggest (also for auto-complete)
console.log(suggest(with8Items)("a")(3)); // 'ab', 'abba', 'aboriginal'
console.log(suggest(with8Items)("a")(4)); // 'ab', 'abba', 'aboriginal', 'aboriginally'
console.log(suggest(with8Items)("a")(5)); // 'ab', 'abba', 'aboriginal', 'aboriginally', 'absent'