如何在javascript中以键值对格式嵌套数组对象

Question

array data=[
{
"id":1,
"name":"john",
"income":22000,
"expenses":15000
},
{
"id":2,
"name":"kiran",
"income":27000,
"expenses":13000
},
{
"id":1,
"name":"john",
"income":35000,
"expenses":24000
}
]

我想创建一个新的数组集在以下格式是在一个键值对。结果集。你能解释一下最好的方法吗?？ 如何使用foreach实现?

尝试使用foreach方法循环每个元素。但是不能得到想要的输出格式

var result= [ {
"name": "john",
"series": [
{
"name": "income",
"value": 22000
},
{
"name": "expenses",
"value": 15000
},

]
},
{
"name": "kiran",
"series": [
{
"name": "income",
"value": 27000
},
{
"name": "expenses",
"value": 13000
},

]
}]

Answer 1

// Your array
const result = [
{
name: "john",
series: [
{
name: "income",
value: 22000,
},
{
name: "expenses",
value: 15000,
},
],
},
{
name: "kiran",
series: [
{
name: "income",
value: 27000,
},
{
name: "expenses",
value: 13000,
},
],
},
];
// What is .map function?
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map
// Output
// map return a new function.
// it's a loop method but more equipped
result.map((item, index) => {
const seriesKeyValues = {};
// forEach is too, it's a loop method.
// but not have a return value,
// just loops and give you item on each loop
item.series.forEach(serie => {
//seriesKeyValues is a object.
// different between seriesKeyValues.serie.name
// it's a bracket notation
// look this documentation
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Object_initializer#computed_property_names
seriesKeyValues[serie.name] = serie.value;
});
// return new Object
// ... is 'spread syntax' basically combine objects
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Object_initializer#spread_properties
// spread syntax is a new way.
// old way is https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
return {
id: index,
name: item.name,
...seriesKeyValues,
};
});

我希望它会有所帮助:)。如果你看不懂任何一行代码，我可以解释