Function calculateLearningTrend

frontend/src/utils/stats.ts:21–29

(
  sessions: PracticeSessionStats[] | undefined,
)

}

export function calculateLearningTrend(
  sessions: PracticeSessionStats[] | undefined,
): number | null {
  if (!sessions || sessions.length < 2) return null
  const firstRate = calculateSessionSuccessRate(sessions[0])
  const lastRate = calculateSessionSuccessRate(sessions[sessions.length - 1])
  if (firstRate === null || lastRate === null) return null
  return lastRate - firstRate
}