convertToRupiah.js

const currencyCode = 'Rp '
const currencyPosition = 'left'
const maxFractionDigits = 2
const decimalSeparator = ','
const thousandSeparator = '.'

function position(currencyPosition, value) {
  return currencyPosition === 'left'
    ? `${currencyCode}${value}`
    : `${value}${currencyCode}`
}

const convertToRupiah = (value) => {
  let result

  if (
    value === 0 ||
    value === null ||
    value === undefined ||
    value === '0' ||
    typeof value === 'string'
  ) {
    return position(currencyPosition, 0)
  }

  const currencyCheck = currencyCode.replace(/\s/g, '').toLowerCase()
  if (currencyCheck === 'idr' || currencyCheck === 'rp') {
    value = Math.ceil(value)
  }

  const valueSplit = String(value.toFixed(maxFractionDigits)).split(
    `${thousandSeparator}`
  )
  const firstvalue = valueSplit[0]
  const secondvalue = valueSplit[1]
  const valueReal = String(firstvalue).replace(
    /\B(?=(\d{3})+(?!\d))/g,
    `${thousandSeparator}`
  )

  if (Number(secondvalue) > 0) {
    result = position(
      currencyPosition,
      `${valueReal}${thousandSeparator}${secondvalue}`
    )
  } else {
    result = position(currencyPosition, `${valueReal}`)
  }

  return result
}

export default convertToRupiah