[英]Count duplicates in an array of objects and sum up values located in the objects
我有一個看起來像這樣的對象數組:
const users = [{name: 'John', gender: 'Male', orders: 20},
{name: 'Doe', gender: 'Male', orders: 8},
{name: 'Ada', gender: 'Female', orders: 10},
{name: 'David', gender: 'Male', orders: 30}];
我需要計算重復性別的數量並根據對象中的性別總結訂單數量。 我希望最終的數組看起來像這樣:
[{gender: 'Male', count: 3, totalOrders: 58}, {gender: 'Female', count: 1, totalOrders: 10}]
這是我到目前為止的代碼:
const usersGender = users.map((user) => user.gender);
const result = Object.values(usersGender.reduce((a, b) => {
a[b] = a[b] || [b, 0];
a[b][1]++;
return a;
},{})).map(item => ({gender: item[0], count : item[1]}));
console.log(result);
上面代碼中的我的 output 是:
[{ gender: 'Male', count: 3 }, { gender: 'Female', count: 1 }]
謝謝你。
您可以使用 object 收集並從中獲取值。
const users = [{ name: 'John', gender: 'Male', orders: 20 }, { name: 'Doe', gender: 'Male', orders: 8 }, { name: 'Ada', gender: 'Female', orders: 10 }, { name: 'David', gender: 'Male', orders: 30 }], result = Object.values(users.reduce((r, { gender, orders }) => { r[gender]??= { gender, count: 0, totalOrders: 0 }; r[gender].count++; r[gender].totalOrders += orders; return r; }, {})); console.log(result);
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