根据值将一个带有对象的数组中的属性添加到另一个数组

Question

我有两个 arrays 对象，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"}]

我想将数组“values”中的属性添加到数组“test”中，结果将是：

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

这可能吗？ 我之所以这样，是因为我需要在开始时指定所有周，并且这些值将从用户那里添加。

Answer 1

首先制作一个 object 映射周到对象以便快速查找，然后循环遍历values数组：

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

循环值 - 查找与当前值的周匹配的测试并将小时数设置为值的小时数

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)