All files / src/irr/convert-rate convert-rate.ts

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export enum RateInterval {
  Day = 'day',
  Week = 'week',
  Month = 'month',
  Year = 'year',
}
 
function parseInterval(interval: RateInterval | number): number {
  switch (interval) {
    case RateInterval.Day:
      return 1
    case RateInterval.Week:
      return 7
    case RateInterval.Month:
      return 30
    case RateInterval.Year:
      return 365
  }
 
  return interval
}
 
export function convertRate(
  rate: number,
  toInterval: RateInterval | number,
  fromInterval: RateInterval | number = RateInterval.Day,
): number {
  return (
    (1 + rate) ** (parseInterval(toInterval) / parseInterval(fromInterval)) - 1
  )
}