Currency for Locale - Render-Optimized (avoid NaN). Example use: React.

Currency-Locale.js

/**
 * Format currency for locale (which can come from anywhere).
 *
 * Ignore nullish values (like undefined) to avoid showing 'NaN €' as text, to keep templating simple.
 * Example use case: First render occurs prior to data being available (e.g. in React).
 */

const locale = 'de-DE'

export default (val) => {
  return new Intl.NumberFormat(locale, {
    style: 'currency',
    currency: 'EUR'
  }).format(val ?? 0)
}