Intl.NumberFormat Get the Currency Code from a Dynamic Locale?

To get the currency code from a dynamic locale using Intl.NumberFormat, you can create a custom function that extracts the currency code from the formatted result. The Intl.NumberFormat object in JavaScript provides localized formatting of numbers, including currencies, based on the specified locale.

Here's how you can achieve this:

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function getCurrencyCodeFromLocale(locale) {
  try {
    const numberFormat = new Intl.NumberFormat(locale, { style: 'currency', currencyDisplay: 'code' });
    const currencyFormat = numberFormat.formatToParts(12345.67);

    // Find the part with type "currency".
    const currencyPart = currencyFormat.find(part => part.type === 'currency');

    if (currencyPart) {
      return currencyPart.value;
    } else {
      // The currency code was not found in the formatToParts result.
      return null;
    }
  } catch (error) {
    // Handle any errors that may occur during number formatting.
    console.error('Error getting currency code:', error);
    return null;
  }
}

Usage:

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const locale = 'de-DE'; // Replace with your desired locale
const currencyCode = getCurrencyCodeFromLocale(locale);

if (currencyCode) {
  console.log('Currency Code:', currencyCode);
} else {
  console.log('Currency Code not found for locale:', locale);
}

In the getCurrencyCodeFromLocale function, we create a new Intl.NumberFormat instance with the specified locale and format a sample number (12345.67) using the formatToParts method. This method returns an array of objects representing the formatted parts of the number, such as the integer, fraction, and currency symbol.

We then find the part with type equal to 'currency', which should contain the currency code. If the currency code is found, we return it. If not, we return null.

Please note that not all locales may have a currency code available, and some locales might return different formats or symbols for the currency. It's essential to test this function with various locales to ensure it behaves as expected in different scenarios.