Expected Usage

expectedUsage.ts

function createNextRatingsFn(
    getExpectedPlayerProbabilities: ExpectedProbabilitiesFn,
    getNextARating: NextRatingFn,
    getNextBRating: NextRatingFn
): NextRatingsFn {
    const nextRatingsFn = (playerARating: number, playerBRating: number, playerAScore: number) => {
        const [expectedPlayerAProbability, expectedPlayerBProbability] = getExpectedPlayerProbabilities(playerARating, playerBRating)
        const aProbability = playerAScore
        const bProbability = 1 - playerAScore

        const [nextPlayerARating, playerARatingDiff] = getNextARating(playerARating, aProbability, expectedPlayerAProbability)
        const [nextPlayerBRating, playerBRatingDiff] = getNextBRating(playerBRating, bProbability, expectedPlayerBProbability)

        return {
            playerAProbability: expectedPlayerAProbability,
            playerBProbability: expectedPlayerBProbability,
            nextPlayerARating,
            playerARatingDiff,
            nextPlayerBRating,
            playerBRatingDiff,
        }
    }

    return nextRatingsFn
}