priceFormat.js

// @flow

export function formatPriceYen(price: number): string {
  return `¥${formatPrice(price)}`
}

export function formatPriceYenMonth(price: number): string {
  return `${formatPriceYen(price)}/月`
}

export function formatPrice(price: number): string {
  return String(price).replace(/(\d)(?=(\d\d\d)+(?!\d))/g, '$1,')
}

export function formatRange(range: { min?: number, max?: number }): string {
  const { min, max } = range
  if (!min && !max) return ''
  return `${min ? formatPriceYenMonth(min) : ''}〜${max ? formatPriceYenMonth(max) : ''}`
}