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>
77 lines
1.9 KiB
TypeScript
77 lines
1.9 KiB
TypeScript
/** A simplified SM-2 schedule. Days are counted as local calendar days. */
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export type Card = {
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due: number;
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interval: number;
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ease: number;
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reps: number;
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lapses: number;
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seen: number;
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right: number;
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last: number;
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};
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export function dayKey(date = new Date()): string {
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const y = date.getFullYear();
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const m = String(date.getMonth() + 1).padStart(2, '0');
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const d = String(date.getDate()).padStart(2, '0');
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return `${y}-${m}-${d}`;
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}
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export function dayNumber(key = dayKey()): number {
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const [y, m, d] = key.split('-').map(Number);
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return Math.round(Date.UTC(y, m - 1, d) / 86_400_000);
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}
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export const newCard = (today: number): Card => ({
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due: today,
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interval: 0,
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ease: 2.5,
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reps: 0,
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lapses: 0,
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seen: 0,
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right: 0,
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last: -1
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});
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export function review(card: Card, correct: boolean, today: number): Card {
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const next = { ...card, seen: card.seen + 1, right: card.right + (correct ? 1 : 0) };
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if (!correct) {
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return {
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...next,
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reps: 0,
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interval: 0,
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lapses: card.lapses + 1,
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ease: Math.max(1.3, card.ease - 0.2),
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due: today,
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last: today
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};
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}
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// Grinding the same card again on one day should not push it months ahead.
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if (card.last === today && card.reps > 0) return next;
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const reps = card.reps + 1;
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const interval =
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reps === 1 ? 1 : reps === 2 ? 3 : Math.round(Math.max(card.interval, 1) * card.ease);
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return {
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...next,
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reps,
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interval,
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ease: Math.min(3, card.ease + 0.05),
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due: today + interval,
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last: today
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};
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}
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export type Mastery = 'new' | 'learning' | 'familiar' | 'known' | 'mastered';
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export function mastery(card: Card | undefined): Mastery {
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if (!card || card.seen === 0) return 'new';
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if (card.interval < 3) return 'learning';
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if (card.interval < 14) return 'familiar';
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if (card.interval < 60) return 'known';
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return 'mastered';
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}
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/** 0 for new cards, approaching 1 for cards reviewed months apart. */
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export const strength = (card: Card | undefined) => (card ? Math.min(1, card.interval / 30) : 0);
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