Stan Runge
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Dutch and Korean (explained in English) and English (explained in Dutch) from A1 to C1, with a Hangul level for Korean. Lessons with notes, words and sentences generate multiple-choice, typing, sentence building, cloze, listening and matching exercises. Endless challenges: a seeded daily challenge, sprint, survival, mixed practice, level tests, spaced-repetition reviews and generated drills (numbers, clock times, de/het, plurals, Dutch and Korean conjugation, particles, Hangul reading, irregular verbs). Progress is stored in localStorage with export/import. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
68 lines
2.3 KiB
TypeScript
68 lines
2.3 KiB
TypeScript
/** Lowercase, strip punctuation and diacritics-insensitive comparison helpers for answers. */
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const PUNCTUATION = /[.,!?¿¡;:"“”„‘’'`()[\]{}…~·-]/g;
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export function normalize(value: string): string {
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return value
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.normalize('NFC')
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.toLowerCase()
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.replace(/[’‘`]/g, "'")
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.replace(PUNCTUATION, ' ')
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.replace(/\s+/g, ' ')
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.trim();
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}
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export function stripDiacritics(value: string): string {
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// Only Latin marks: decomposing Hangul would break Korean answers.
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return value.replace(/[À-ɏ]/g, (c) => c.normalize('NFD').replace(/[̀-ͯ]/g, ''));
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}
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export function distance(a: string, b: string): number {
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const row = Array.from({ length: b.length + 1 }, (_, i) => i);
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for (let i = 1; i <= a.length; i++) {
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let previous = row[0];
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row[0] = i;
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for (let j = 1; j <= b.length; j++) {
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const current = row[j];
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row[j] = Math.min(row[j] + 1, row[j - 1] + 1, previous + (a[i - 1] === b[j - 1] ? 0 : 1));
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previous = current;
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}
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}
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return row[b.length];
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}
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export type Verdict = 'correct' | 'accent' | 'typo' | 'wrong';
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/** Compare a typed answer with every accepted answer, forgiving accents and one-letter typos. */
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export function grade(input: string, accepted: string[]): { verdict: Verdict; match: string } {
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const given = normalize(input);
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let best: { verdict: Verdict; match: string } = { verdict: 'wrong', match: accepted[0] };
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if (!given) return best;
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for (const answer of accepted) {
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const expected = normalize(answer);
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if (given === expected) return { verdict: 'correct', match: answer };
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if (stripDiacritics(given) === stripDiacritics(expected))
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best = { verdict: 'accent', match: answer };
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else if (
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best.verdict === 'wrong' &&
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[...expected].length >= 5 &&
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distance(stripDiacritics(given), stripDiacritics(expected)) === 1
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)
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best = { verdict: 'typo', match: answer };
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}
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return best;
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}
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/** Split a sentence into word tiles, keeping punctuation attached to the word. */
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export function tiles(sentence: string): string[] {
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return sentence.split(/\s+/).filter(Boolean);
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}
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export function sameTiles(a: string[], b: string[]): boolean {
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return normalize(a.join(' ')) === normalize(b.join(' '));
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}
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/** Key for telling multiple-choice options apart; unlike `normalize` it keeps apostrophes (its / it's). */
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export const optionKey = (value: string) =>
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value.normalize('NFC').trim().toLowerCase().replace(/\s+/g, ' ');
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