根據值將一個帶有對象的數組中的屬性添加到另一個數組

Question

我有兩個 arrays 對象，如下所示：

let test = [
{Course: "", Week: "1", Hours: ""}, 
{Course: "", Week: "2", Hours: ""}, 
{Course: "", Week: "3", Hours: ""}
]

let values = [{Course: "A", Week: "3", Hours: "1"}]

我想將數組“values”中的屬性添加到數組“test”中，結果將是：

let test = [
{Course: "", Week: "1", Hours: ""}, 
{Course: "", Week: "2", Hours: ""}, 
{Course: "", Week: "3", Hours: "1"}
]

這可能嗎？ 我之所以這樣，是因為我需要在開始時指定所有周，並且這些值將從用戶那里添加。

Answer 1

首先制作一個 object 映射周到對象以便快速查找，然后循環遍歷values數組：

const lookup = {};
for (const val of test) {
    lookup[val.week] = val;
}
for (const val of values) {
    const cur = lookup[val.week];
    for (const key in val) {
        if (key === "Hours") {
            cur[key] = (Number(cur[key]) + Number(val[key])).toString();
        } else {
            cur[key] = val[key];
        }
    }
}

Answer 2

循環值 - 查找與當前值的周匹配的測試並將小時數設置為值的小時數

values.forEach((value) => {
    //Find the test that matches current value's week and set hours to value's hours
    test.find(test => test.Week === val.Week).Hours = value.Hours);
});

Answer 3

您可以使用 array.find function。

 let test = [ {Course: "", Week: "1", Hours: ""}, {Course: "", Week: "2", Hours: ""}, {Course: "", Week: "3", Hours: ""} ] let values = [{Course: "A", Week: "3", Hours: "1"}] var current = test.find((item) => { return item.Week === values[0].Week }) current.Hours += values[0].Hours; console.log(test)