Lodash如何将对象转换为排序数组 [英] How to transform object into sorted array by Lodash

问题描述

如何通过lodash将{2:'b',3:'c',1:'a'}转换为[{1:'a'},{2:'b'},{3:'c'}]?

How to transform {2:'b',3:'c',1:'a'} into [{1:'a'},{2:'b'},{3:'c'}] by lodash?

推荐答案

使用Object.keys + Array.map相当简单，您真的不需要lodash:

It's fairly trivial using Object.keys + Array.map, you really don't need lodash:

const obj = {2:'b',3:'c',1:'a'};
const arr = Object.keys(obj).map(key => ({ [key]: obj[key] }))

console.log(arr)

关于缺少sort函数的问题，以上代码利用了这样一个事实，即按索引(按规范)顺序存储数字索引的对象键.亲自检查订单:

Regarding the lack of a sort function, the above code is exploiting the fact that numerically indexed Object keys are (per the spec) stored sequentially. Check the order for yourself:

console.log({2:'b',3:'c',1:'a'})

这是

9.1.12 [[OwnPropertyKeys]]()

9.1.12 [[OwnPropertyKeys]] ( )

当O的[[OwnPropertyKeys]]内部方法称为 采取以下步骤:

When the [[OwnPropertyKeys]] internal method of O is called the following steps are taken:

1. 让键成为一个新的空列表.

1. Let keys be a new empty List.

对于每个人 O的属性键P，它是整数索引，以递增数字表示 索引顺序

For each own property key P of O that is an integer index, in ascending numeric index order

2a.将P添加为键的最后一个元素.

2a. Add P as the last element of keys.

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