如何在JavaScript中迭代一组对象并构建一个新对象？
假设我们有一个像这样的对象数组-
const arr = [
{
"customer": "Customer 1",
"project": "1"
},
{
"customer": "Customer 2",
"project": "2"
},
{
"customer": "Customer 2",
"project": "3"
}
]我们需要编写一个JavaScript函数，该函数接受一个这样的数组，并产生（返回）一个新的数组。
在新数组中，所有具有相同值的客户键都应合并，并且输出应类似于以下内容：
const output = [
{
"Customer 1": {
"projects": "1"
}
},
{
"Customer 2": {
"projects": [
"2",
"3"
]
}
}
]示例
让我们写代码-
const arr = [
{
"customer": "Customer 1",
"project": "1"
},
{
"customer": "Customer 2",
"project": "2"
},
{
"customer": "Customer 2",
"project": "3"
}
]
const groupCustomer = data => {
const res = [];
data.forEach(el => {
let customer = res.filter(custom => {
return el.customer === custom.customer;
})[0];
if(customer){
customer.projects.push(el.project);
}else{
res.push({ customer: el.customer, projects: [el.project] });
};
});
return res;
};
console.log(groupCustomer(arr));输出结果
控制台中的输出将是-
[
{ customer: 'Customer 1', projects: [ '1' ] },
{ customer: 'Customer 2', projects: [ '2', '3' ] }
]