按多个值对数组项进行分组，并对组进行求和

const data = [
  { value1: 'A', value2: 'X', value3: 10, value4: 'foo' },
  { value1: 'A', value2: 'Y', value3: 20, value4: 'bar' },
  { value1: 'B', value2: 'X', value3: 30, value4: 'baz' },
  { value1: 'B', value2: 'Y', value3: 40, value4: 'qux' },
  { value1: 'A', value2: 'X', value3: 50, value4: 'quux' },
];

const groupedData = data.reduce((result, item) => {
  const key = item.value1 + '-' + item.value2;
  if (!result[key]) {
    result[key] = { value1: item.value1, value2: item.value2, sum: item.value3 };
  } else {
    result[key].sum += item.value3;
  }
  return result;
}, {});

console.log(groupedData);

{
  "A-X": { value1: 'A', value2: 'X', sum: 60 },
  "A-Y": { value1: 'A', value2: 'Y', sum: 20 },
  "B-X": { value1: 'B', value2: 'X', sum: 30 },
  "B-Y": { value1: 'B', value2: 'Y', sum: 40 }
}