在JavaScript中计算分组数组中的金额

const data = [
  { group: 'A', amount: 100 },
  { group: 'B', amount: 200 },
  { group: 'A', amount: 300 },
  { group: 'C', amount: 400 },
  { group: 'B', amount: 500 }
];

const groupedData = data.reduce((result, item) => {
  if (!result[item.group]) {
    result[item.group] = [];
  }
  result[item.group].push(item.amount);
  return result;
}, {});

const totalAmounts = Object.keys(groupedData).map(group => {
  const amounts = groupedData[group];
  const total = amounts.reduce((sum, amount) => sum + amount, 0);
  return { group, total };
});

totalAmounts.forEach(item => {
  console.log(`Group ${item.group}: Total amount is ${item.total}`);
});