A minimalistic implementation of FSRS 5 spaced repetition algorithm
npm install femto-fsrsA zero dependency implementation of the FSRS 5 spaced repetition algorithm.
This is the scheduler used by Koala.Cards.
I made an HTML pen-and-paper demo here. You can store facts on paper and use Femto-FSRS for scheduling, just like Piotr Wozniak did in the 80s.
- Zero dependencies
- Follows the paper.
- Sensible defaults.
``typescript
import { Grade, createDeck } from "femto-fsrs";
// === Create a new deck
const { newCard, gradeCard } = createDeck();
// === Initiate a new card with an initial grade of "GOOD":
const initialGrade = Grade.GOOD;
const myCard = newCard(initialGrade);
// === Grade the card as "easy" two days later.
// Returns a new card that replaces the old one.
const daysSinceReview = 2;
const nextCard = gradeCard(myCard, daysSinceReview, Grade.EASY);
// The "I" attribute represents "I" like in the FSRS paper.
// It is the next review date at which the probability
// of success is 90% (assuming you used default parameters).
const nextReview = nextCard.I.toFixed(2);
// Print results:
console.log(Card will be due for review in ${nextReview} day(s));`
Result:
`
Card will be due for review in 16.63 day(s)
`
npm install femto-fsrs
This is supposed to be a minimalistic library that can be used as a starting point
for FSRS-enhanced apps. If you need a more full-featured offering with features
like logs (so you can optimize your w param) or revert, etc.., check out ts-fsrs.
`
npm run test