我想将事件按年度和月份分组。我的数据如下所示：
const events = [
{
name: "event 1",
year: 2021,
month: 1,
},
{
name: "event 2",
year: 2021,
month: 9,
},
{
name: "event 3",
year: 2021,
month: 1,
},
{
name: "event 4",
year: 2022,
month: 7,
},
]我的预期结果应该是这样的：
[
{
year: 2021,
month: 1,
events: [
{
name: "event 1"
},
{
name: "event 3"
}
]
},
{
year: 2021,
month: 9,
events: [
{
name: "event 2"
}
]
}
]这样做的最佳方法是什么？我发现了几个stackoverflow帖子，可以根据数组的键值对数组进行分组，但这不是我要找的。
const groupBy = (array, key) => {
return array.reduce((result, currentValue) => {
// If an array already present for key, push it to the array. Else create an array and push the object
(result[currentValue[key]] = result[currentValue[key]] || []).push(currentValue);
// Return the current iteration `result` value, this will be taken as next iteration `result` value and accumulate
return result;
}, {}); // empty object is the initial value for result object
};
const groupedByYear = groupBy(events, 'year');
2条答案
按热度按时间6mzjoqzu1#
你可以用它来做这个
reduce及Object.values```const events = [
{
name: "event 1",
year: 2021,
month: 1,
},
{
name: "event 2",
year: 2021,
month: 9,
},
{
name: "event 3",
year: 2021,
month: 1,
},
];
const result = Object.values(events.reduce( (acc,evt) => {
const key =
${evt.year}-${evt.month};if(!acc[key]) {
acc[key] = {year: evt.year, month: evt.month, events:[]}
}
acc[key].events.push( {name:evt.name} );
return acc;
},{}));
console.log(result);
sbdsn5lh2#
您可以采用一种动态方法，为分组所需的属性使用一个组合键。
然后移除所有灌浆键，并推动一个没有不需要属性的新对象。