Javascript Shopify currency helpers

shopify_currency_helper.js

/**
 * Currency Helpers
 * -----------------------------------------------------------------------------
 * A collection of useful functions that help with currency formatting
 *
 * Current contents
 * - formatMoney - Takes an amount in cents and returns it as a formatted dollar value.
 *
 */

const moneyFormat = '${{amount}}';

/**
 * Format money values based on your shop currency settings
 * @param  {Number|string} cents - value in cents or dollar amount e.g. 300 cents
 * or 3.00 dollars
 * @param  {String} format - shop money_format setting
 * @return {String} value - formatted value
 */
export function formatMoney(cents, format) {
  if (typeof cents === 'string') {
    cents = cents.replace('.', '');
  }
  let value = '';
  const placeholderRegex = /\{\{\s*(\w+)\s*\}\}/;
  const formatString = format || moneyFormat;

  function formatWithDelimiters(
    number,
    precision = 2,
    thousands = ',',
    decimal = '.'
  ) {
    if (isNaN(number) || number == null) {
      return 0;
    }

    number = (number / 100.0).toFixed(precision);

    const parts = number.split('.');
    const dollarsAmount = parts[0].replace(
      /(\d)(?=(\d\d\d)+(?!\d))/g,
      `$1${thousands}`
    );
    const centsAmount = parts[1] ? decimal + parts[1] : '';

    return dollarsAmount + centsAmount;
  }

  switch (formatString.match(placeholderRegex)[1]) {
    case 'amount':
      value = formatWithDelimiters(cents, 2);
      break;
    case 'amount_no_decimals':
      value = formatWithDelimiters(cents, 0);
      break;
    case 'amount_with_comma_separator':
      value = formatWithDelimiters(cents, 2, '.', ',');
      break;
    case 'amount_no_decimals_with_comma_separator':
      value = formatWithDelimiters(cents, 0, '.', ',');
      break;
  }

  return formatString.replace(placeholderRegex, value);
}