如何以上述格式重新排列数据。我必须重新格式化数组并制作新的数组：
[
{
"cost":"1.3947648891000006",
"start_date":"2020-06-10",
"account":"1"
},
{
"cost":"1.4069091170999999",
"start_date":"2020-06-11",
"account":"1"
},
{
"cost":"1.401164025099997",
"start_date":"2020-06-11",
"account":"2"
},
{
"cost":"2.50928182113",
"start_date":"2020-06-12",
"account":"2"
}
]
至：
[
{
"start_date":"2020-06-10",
"account_1_cost":"1.3947648891000006"
},
{
"start_date":"2020-06-11",
"account_1_cost":"1.4069091170999999",
"account_2_cost":"1.401164025099997"
},
{
"start_date":"2020-06-12",
"account_2_cost":"2.50928182113"
}
]
我尝试过reduce函数和map函数都没有用。
只需使用array.reduce
const arr =
[ { cost: '1.3947648891000006', start_date: '2020-06-10', account: '1' }
, { cost: '1.4069091170999999', start_date: '2020-06-11', account: '1' }
, { cost: '1.401164025099997', start_date: '2020-06-11', account: '2' }
, { cost: '2.50928182113', start_date: '2020-06-12', account: '2' }
]
const res =
arr.reduce((acc,{cost, start_date, account})=>
{
let el = acc.find(x=>x.start_date===start_date)
if (!el) acc.push(el = { start_date })
el[`account_${account}_cost`] = cost
return acc
},[])
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