import * as R from 'ramda';

/**
 * 数值转化为 千分位 展示
 * @param num 
 * @param separator 分隔符，默认 ','
 */
export const numberToThousand = (num: number | string, separator = ','): number | string => {
  if (R.isEmpty(num) || R.isNil(num)) return num;
  if (isNaN(Number(num))) {
    return NaN;
  }

  return num.toString().replace(/\d+/, (n: string) =>
    n.replace(
      /(\d)(?=(\d{3})+$)/g,
      (
        $1: string,
      ) => `${$1}${separator}`,
    ),
  );
}