wallet

// Sample Wallet Data
const wallet = [
  { value: 30.3, rate: 400.12, type: 'GAU' },
  { value: 1520, rate: 7.82, type: 'USD' },
  { value: 20, rate: 403.2, type: 'GAU' },
  { value: 345, rate: 10.14, type: 'EUR' }
];
// Sample Currencies
const currentRates = {
  GAU: 450.44,
  USD: 7.98,
  EUR: 9.45
};

const formatAmount = (number, fraction = 2) => Number(number.toFixed(fraction));

const getSummary = () => {
  const summary = {};

  const getTotalByKey = key =>
    Object.keys(summary).reduce((i, j) => {
      return i + summary[j][key];
    }, 0);

  const getSummaryItem = (value, spentMoney, currentMoney, profit) => {
    return {
      value,
      spentMoney: formatAmount(spentMoney),
      currentMoney: formatAmount(currentMoney),
      profit: formatAmount(profit)
    };
  };

  Object.keys(currentRates).forEach(typeRateKey => {
    const walletItems = wallet.filter(item => item.type === typeRateKey);
    const value = walletItems.reduce((i, j) => {
      return i + j.value;
    }, 0);
    const spentMoney = walletItems.reduce((i, j) => {
      return i + j.value * j.rate;
    }, 0);
    const currentMoney = currentRates[typeRateKey] * value;
    const profit = currentMoney - spentMoney;

    summary[typeRateKey] = getSummaryItem(value, spentMoney, currentMoney, profit);
  });

  summary.TOTAL = getSummaryItem(
    null,
    getTotalByKey('spentMoney'),
    getTotalByKey('currentMoney'),
    getTotalByKey('profit')
  );

  return summary;
};

console.table(getSummary());