如何迭代对象并构建新对象

How to iterate an object and build a new one

本文关键字：对象 构建 新对象 何迭代 迭代      更新时间：2023-09-26

我正在使用JavaScript在一个对象中迭代客户，该对象构造如下：

[
{
    "customer": "Customer 1",
    "project": "1"
},
{
    "customer": "Customer 2",
    "project": "2"
},
{
    "customer": "Customer 2",
    "project": "3"
}
]

我希望在迭代中构建一个新对象，该对象将像这样构造：

[
{
    "Customer 1": {
        "projects": "1"
    }
},
{
    "Customer 2": {
        "projects": [
            "2",
            "3"
        ]
    }
}
]

如何实现这一点的任何提示？

您可以创建一个中间对象来形成内部级别对象。使用该对象上的迭代器从中形成数组。

有关示例代码，请参阅下文。

var response = [
{
    "customer": "Customer 1",
    "project": "1"
},
{
    "customer": "Customer 2",
    "project": "2"
},
{
    "customer": "Customer 2",
    "project": "3"
}
];
var length = response.length,
    i = 0,
    result = {},
    j = 0,
    finalResult = [];
for(;i<length;i++){
    var eachObj = response[i];
    if(!result[response[i].customer]){
       result[response[i].customer] = [response[i].project];
    }
    else{
        result[response[i].customer].push(response[i].project);
    }
}
for(var key in result){  
    var eachObj = [];
    eachObj[key] = result[key];
    finalResult.push(eachObj);
}
console.log(finalResult);

在新数组中查找客户，如果找到，则添加项目，否则添加客户。

var data = [
    {
        "customer": "Customer 1",
        "project": "1"
    },
    {
        "customer": "Customer 2",
        "project": "2"
    },
    {
        "customer": "Customer 2",
        "project": "3"
    }
];
var newData = [];
data.forEach(function (el, i) {
    var customer = newData.filter(function (ell) {
        return el.customer === ell.customer;
    })[0];
    if (customer) {
        customer.projects.push(el.project);
    } else {
        newData.push({ customer: el.customer, projects: [el.project] });
    }
});
document.write('<pre>' + JSON.stringify(newData, null, 4) + '</pre>');
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