有一個具有一些嵌套屬性的物件陣列：
const sports = [{
name: "Basketball",
leagues: [{
createdAt: 1
}, {
createdAt: 2
}]
},{
name: "Soccer",
leagues: [{
createdAt: 3
}, {
createdAt: 4
}]
}]
要獲取按名稱 DESC（Z->A）（非嵌套屬性）排序的物件陣列，我這樣做：
const sorted = _.orderBy(sports, item => item.name, ['desc']);
結果是
[{ name: "Soccer", ... },{ name: "Basketball", ... }]
我想要實作的是根據物件的嵌套陣列leagues.createdAtDESC 對該物件進行排序（假設 1、2、3、4 是正確的時間戳）：
[{
name: "Soccer",
leagues: [{
createdAt: 4
}, {
createdAt: 3
}]
},{
name: "Basketball",
leagues: [{
createdAt: 2
}, {
createdAt: 1
}]
}]
試圖這樣做：
const sorted = _.orderBy(sports, [(item) => item.leagues[0].createdAt], ["desc"])
但順序不太正確：
uj5u.com熱心網友回復：
您需要映射有序陣列，并leagues使用_.orderBy(). 我正在使用_.flow()創建一個函式，該函式首先對整個陣列進行排序，然后leagues在每個物件中映射和排序。
const { flow, orderBy, map } = _
const fn = flow(
arr => orderBy(arr, 'name', 'desc'),
arr => map(arr, ({ leagues, ...o }) => ({
...o,
leagues: orderBy(leagues, 'createdAt', 'desc')
}))
)
const sports = [{"name":"Basketball","leagues":[{"createdAt":1},{"createdAt":2}]},{"name":"Soccer","leagues":[{"createdAt":3},{"createdAt":4}]}]
const result = fn(sports)
console.log(result)<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js" integrity="sha512-WFN04846sdKMIP5LKNphMaWzU7YpMyCU245etK3g/2ARYbPK9Ub18eG ljU96qKRCWh quCY7yefSmlkQw1ANQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>轉載請註明出處，本文鏈接：https://www.uj5u.com/yidong/441077.html
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