用lodash按值对对象排序

问题描述

我有一个看起来像这样的对象:

var unsorted = {a: 15, b: 1,c: 2, d: 4, e: 3, f: 6, g: 1}

我感兴趣的是用lodash按降序对它进行排序，因此预期结果应该是:

var sortd = {b: 1, g: 1,c: 2, e: 3, d: 4, f: 6, a: 15}

我尝试过使用lodash orderBy，但是它只给出了排序后的值组成的数组.

_.orderBy(tempCount, Number, ['desc'])

//Result
[1,1,2,3,4,6,15]

解决方案

您可以使用已排序的键/值对构建新对象.

实际标准或属性顺序:

• 首先对键之类的索引进行排序
• 按插入顺序保留所有其他键

要完全控制订单，请使用带有键的数组，并将其作为值的排序访问器.

 var unsorted = { a: 15, b: 1,c: 2, d: 4, e: 3, f: 6, g: 1 },
    sorted = _(unsorted)
        .toPairs()
        .orderBy([1], ['desc'])
        .fromPairs()
        .value()

console.log(sorted); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script> 

通过使用特定参数的最后一个参数，对 _.orderBy 进行降序排序顺序，而不是 _.sortBy ，它仅允许升序排序.

 var unsorted = { a: 15, b: 1,c: 2, d: 4, e: 3, f: 6, g: 1 },
    sorted = _(unsorted)
        .toPairs()
        .orderBy(1, 'desc')
        .fromPairs()
        .value()

console.log(sorted); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script> 

I have an object that looks like this:

var unsorted = {a: 15, b: 1,c: 2, d: 4, e: 3, f: 6, g: 1}

And I am interested in sorted it in descending order with lodash, so the expected result should be:

var sortd = {b: 1, g: 1,c: 2, e: 3, d: 4, f: 6, a: 15}

I have tried using lodash orderBy but it gives an array of just the values sorted.

_.orderBy(tempCount, Number, ['desc'])

//Result
[1,1,2,3,4,6,15]

解决方案

You could build a new object with the sorted key/value pairs.

The actual standard or the order of properties:

• sort index like keys first, in order
• keep all other keys in insertation order

For a complete control over the order, take an array with the keys an take it as sorted accessor for the values.

var unsorted = { a: 15, b: 1,c: 2, d: 4, e: 3, f: 6, g: 1 },
    sorted = _(unsorted)
        .toPairs()
        .orderBy([1], ['desc'])
        .fromPairs()
        .value()

console.log(sorted);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

Descending sort with _.orderBy by using a the last parameter for a specific order, instead of _.sortBy, which only allows to sort ascending.

var unsorted = { a: 15, b: 1,c: 2, d: 4, e: 3, f: 6, g: 1 },
    sorted = _(unsorted)
        .toPairs()
        .orderBy(1, 'desc')
        .fromPairs()
        .value()

console.log(sorted);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

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