[英]convert nested array to single object with key values Javascirpt
我有一个包含嵌套数组的数组。
嵌套数组可以包含多个对象。
const axisChoiceLoop = _.map(groupByAxisChoice)
输出:
[
0: [ {age: 15, count: 242, role: "JW"}] // length 1
1: [ {age: 21, count: 995, role: "JW"} , {age: 21, count: 137, role: "SW"} ] // length 2
2: [ {age: 25, count: 924, role: "JW"}, {age: 25, count: 455, role: "SW"}, {age: 25, count: 32, role: "EW"} ]
]
我希望嵌套数组是单个对象,使用它们的角色作为键,并算作值
预期输出看起来像这样
[
{age :15, JW: 242},
{age: 21, JW:995, SW: 137},
{age: 25, JW: 924, SW: 445, EW: 32}
]
编辑:我尝试了以下代码
const result = groupByAxisChoice.reduce(
(obj, item) => Object.assign(obj, { [item.role]: item.count }),
{},
)
哪些输出: { undefined: undefined }
弄清楚了...
const result = groupByAxisChoice.map(items =>
items.reduce((obj, item) => Object.assign(obj, { age: item.age, [item.role]: item.count }), {}),
)
这就是我的结果,我知道它没有优化:
var arr = [
[ {age: 15, count: 242, role: "JW"}], // length 1
[ {age: 21, count: 995, role: "JW"} , {age: 21, count: 137, role: "SW"} ], // length 2
[ {age: 25, count: 924, role: "JW"}, {age: 25, count: 455, role: "SW"}, {age: 25, count: 32, role: "EW"} ]
];
var newArr = [];
arr.forEach(function(a) {
var ob = {age: a[0].age};
a.forEach(d => ob[d.role] = d.count);
newArr.push(ob);
});
我会努力让它变得更好(我不知道如何使用underscore.js)...
另一种解决方案
const b = a.map(item => {
return item.reduce((arr,curr) => {
return {
...arr,
['age']: curr['age'],
[curr['role']]: curr['count'],
}
}, {})
})
console.log(b)
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