如何從 JavaScript 中的對象數組中獲取唯一值，但按特定值過濾

Question

我想擴展前段時間提出的問題： 如何從 JavaScript 中的對象數組中獲取不同的值？

我的情況非常相似：我有以下內容：

var array = 
    [
        {"name":"Doctor", "age":17}, 
        {"name":"Doctor", "age":17},
        {"name":"Doctor", "age":18},
        {"name":"Nurse", "age":17}, 
        {"name":"Nurse", "age": 35}
        {"name":"Nurse", "age": 35}
    ]

能夠獲得所有不同年齡的數組的最佳方法是什么，但是對於選擇的專業，我得到一個結果數組：

按doctor參數過濾： [17, 18]

按nurse參數過濾： [17, 35]

Answer 1

使用數組函數

 const array = [{ "name": "Doctor", "age": 17 }, { "name": "Doctor", "age": 18 }, { "name": "Nurse", "age": 17 }, { "name": "Nurse", "age": 35 } ] console.log(getUniqueAges(array, 'Doctor')) console.log(getUniqueAges(array, 'Nurse')) function getUniqueAges(data, name) { return [...new Set(data.filter(datum => datum.name === name).map(datum => datum.age))] }

Answer 2

就像在您鏈接的答案中一樣，但是您在將數組傳遞給 Set 之前過濾（下面的示例按 name==="doctor 過濾）數組：

const data =     [
    {"name":"Doctor", "age":17}, 
    {"name":"Doctor", "age":18},
    {"name":"Nurse", "age":17}, 
    {"name":"Nurse", "age": 35}
];
const unique = [...new Set(data.filter(item => item.name === "doctor").map(item => item.age))]; // [ '17', '18']