const myArray = [
  { name: 'John', age: 25, gender: 'male' },
  { name: 'Jane', age: 30, gender: 'female' },
  { name: 'Bob', age: 20, gender: 'male' },
  { name: 'Alice', age: 35, gender: 'female' },
  { name: 'Tom', age: 28, gender: 'male' },
  { name: 'Cathy', age: 32, gender: 'female' }
];
// 定义一个函数，用于根据对象属性值分组
function groupBy (array, property) {
  return array.reduce(function (acc, obj) {
    let key = obj[property];
    if (!acc[key]) {
      acc[key] = [];
    }
    acc[key].push(obj);
    return acc;
  }, {});
}
// 根据性别属性值将数组分组
const groupedArray = groupBy(myArray, 'gender');
// 输出分组后的数组
console.log(groupedArray);


//返回分组数据格式
/**
[ 
name: 'John', 
count: 68, 
data:[], 
]
*/

const myArray = [
  { name: 'John', count: 25, date: '2023-06-15' },
  { name: 'Jane', count: 30, date: '2023-06-15' },
  { name: 'Alice', count: 20, date: '2023-06-15' },
  { name: 'John', count: 35, date: '2023-06-16' },
  { name: 'Jane', count: 28, date: '2023-06-16' },
  { name: 'Alice', count: 32, date: '2023-06-16' },
  { name: 'John', count: 3, date: '2023-06-17' },
  { name: 'Jane', count: 8, date: '2023-06-17' },
  { name: 'Alice', count: 6, date: '2023-06-17' },
  { name: 'John', count: 5, date: '2023-06-18' },
  { name: 'Jane', count: 17, date: '2023-06-18' },
  { name: 'Alice', count: 46, date: '2023-06-18' },
];

const result = {};
myArray.forEach(item => {
  if (!result[item.name]) {
    result[item.name] = {
      name: item.name,
      count: 0,
      data: []
    };
  }
  result[item.name].count += item.count;
  result[item.name].data.push({
    count: item.count,
    date: item.date
  });
});

const total = output.reduce((prev, current) => {
  return prev + current.count;
}, 0);
output.push({
  name: '合计',
  count: total,
  data: []
});
const dateMap = new Map();
output.forEach(item => {
  item.data.forEach(dataItem => {
    if (!dateMap.has(dataItem.date)) {
      dateMap.set(dataItem.date, {
        date: dataItem.date,
        count: 0
      });
    }
    dateMap.get(dataItem.date).count += dataItem.count;
  });
});
const dateArray = Array.from(dateMap.values());
output[output.length - 1].data = dateArray;

const output = Object.values(result);
console.log(output);