使用 linq.js 从多个对象创建 JSON 个对象数组

Question

我有一个 JSON 数组，如下所示：

var jsonArray = [
    { Date: "2010-02-25", Size:"Large", Type:"a", Value: "100"},
    { Date: "2010-02-25", Size:"Medium", Type:"a", Value: "160"},
    { Date: "2010-02-25", Size:"Small", Type:"a", Value: "200"},
    { Date: "2010-02-25", Size:"Large", Type:"b", Value: "400"},
    { Date: "2010-02-25", Size:"Medium", Type:"b", Value: "120"},
    { Date: "2010-02-25", Size:"Small", Type:"b", Value: "170"}
]

我一直在使用 linq.js 并且我试图操纵上面的 JSON 所以 6 个对象变成了 2 个，所以我剩下一个如下所示的数组：

var desiredArray = [

    { Date: "2010-02-25", Large:"100", Medium: "160", Small: "200", Type:"a" }
    { Date: "2010-02-25", Large:"400", Medium: "120", Small: "170", Type:"b" }

]

不过我还是第一次用linq。我花了很长时间想弄明白，但我真的不知道如何开始。

谁能指出我正确的方向？

任何帮助将不胜感激

Answer 1

这是实现此目的的一种方法：

var jsonArray = [
    { Date: "2010-02-25", Size:"Large", Type:"a", Value: "100"},
    { Date: "2010-02-25", Size:"Medium", Type:"a", Value: "160"},
    { Date: "2010-02-25", Size:"Small", Type:"a", Value: "200"},
    { Date: "2010-02-25", Size:"Large", Type:"b", Value: "400"},
    { Date: "2010-02-25", Size:"Medium", Type:"b", Value: "120"},
    { Date: "2010-02-25", Size:"Small", Type:"b", Value: "170"}
];

function makeGroupKey(item) {
    return JSON.stringify({
        Date: item.Date,
        Type: item.Type
    });
}

function mergeItems(items) {
    return items.Aggregate(JSON.parse(items.Key()), function (prev, next) {
        prev[next.Size] = next.Value;
        return prev;
    });
}

var result = Enumerable.From(jsonArray)
    .GroupBy(makeGroupKey)
    .Select(mergeItems)
    .ToArray();

console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/linq.js/2.2.0.2/linq.min.js"></script>

使用 linq.js 从多个对象创建 JSON 个对象数组

Creat array of JSON objects from mulitple objects using linq.js

javascript

linq.js