我有一个JavaScript对象数组:

var objs = [ 
    { first_nom: 'Lazslo', last_nom: 'Jamf'     },
    { first_nom: 'Pig',    last_nom: 'Bodine'   },
    { first_nom: 'Pirate', last_nom: 'Prentice' }
];

如何在JavaScript中按last_nom的值对它们进行排序?

我知道排序(a,b),但这似乎只适用于字符串和数字。是否需要向对象添加toString()方法?


当前回答

您还可以创建一个动态排序函数,根据传递的值对对象进行排序:

function dynamicSort(property) {
    var sortOrder = 1;
    if(property[0] === "-") {
        sortOrder = -1;
        property = property.substr(1);
    }
    return function (a,b) {
        /* next line works with strings and numbers, 
         * and you may want to customize it to your needs
         */
        var result = (a[property] < b[property]) ? -1 : (a[property] > b[property]) ? 1 : 0;
        return result * sortOrder;
    }
}

所以你可以有一个这样的对象数组:

var People = [
    {Name: "Name", Surname: "Surname"},
    {Name:"AAA", Surname:"ZZZ"},
    {Name: "Name", Surname: "AAA"}
];

…当你这样做时,它会起作用:

People.sort(dynamicSort("Name"));
People.sort(dynamicSort("Surname"));
People.sort(dynamicSort("-Surname"));

事实上,这已经回答了问题。下面的部分是因为许多人联系我,抱怨它不适用于多个参数。

多个参数

您可以使用下面的函数生成具有多个排序参数的排序函数。

function dynamicSortMultiple() {
    /*
     * save the arguments object as it will be overwritten
     * note that arguments object is an array-like object
     * consisting of the names of the properties to sort by
     */
    var props = arguments;
    return function (obj1, obj2) {
        var i = 0, result = 0, numberOfProperties = props.length;
        /* try getting a different result from 0 (equal)
         * as long as we have extra properties to compare
         */
        while(result === 0 && i < numberOfProperties) {
            result = dynamicSort(props[i])(obj1, obj2);
            i++;
        }
        return result;
    }
}

这将使您能够执行以下操作:

People.sort(dynamicSortMultiple("Name", "-Surname"));

子类化数组

对于我们中能够使用ES6的幸运者,ES6允许扩展本机对象:

class MyArray extends Array {
    sortBy(...args) {
        return this.sort(dynamicSortMultiple(...args));
    }
}

这将实现:

MyArray.from(People).sortBy("Name", "-Surname");

其他回答

我一直在各种项目中使用这个实用程序,而且效果很好。它也非常模块化:

传递要排序的键的名称选择排序是升序还是降序

按KeyUtil.js排序对象数组

// Sort array of objects by key
// ------------------------------------------------------------
const sortArrayOfObjsByKey = (array, key, ascdesc) =>
  array.sort((a, b) => {
    const x = a[key];
    const y = b[key];
    if (ascdesc === 'asc') {
      return x < y ? -1 : x > y ? 1 : 0;
    }
    if (ascdesc === 'desc') {
      return x > y ? -1 : x < y ? 1 : 0;
    }
    return null;
  });

按KeyUtil.test.js排序对象数组

import sortArrayOfObjsByKey from './sortArrayOfObjsByKeyUtil';

const unsortedArray = [
  {
    _id: '3df55221-ce5c-4147-8e14-32effede6133',
    title: 'Netlife Design',
    address: {
      PostalAddress: {
        streetAddress: 'Youngstorget 3',
        addressLocality: 'Oslo',
        addressRegion: null,
        postalCode: '0181',
        addressCountry: 'Norway',
      },
    },
    geopoint: { lat: 59.914322, lng: 10.749272 },
  },
  {
    _id: 'cd00459f-3755-49f1-8847-66591ef935b2',
    title: 'Home',
    address: {
      PostalAddress: {
        streetAddress: 'Stockfleths gate 58A',
        addressLocality: 'Oslo',
        addressRegion: null,
        postalCode: '0461',
        addressCountry: 'Norway',
      },
    },
    geopoint: { lat: 59.937316, lng: 10.751862 },
  },
];

const sortedArray = [
  {
    _id: 'cd00459f-3755-49f1-8847-66591ef935b2',
    title: 'Home',
    address: {
      PostalAddress: {
        streetAddress: 'Stockfleths gate 58A',
        addressLocality: 'Oslo',
        addressRegion: null,
        postalCode: '0461',
        addressCountry: 'Norway',
      },
    },
    geopoint: { lat: 59.937316, lng: 10.751862 },
  },
  {
    _id: '3df55221-ce5c-4147-8e14-32effede6133',
    title: 'Netlife Design',
    address: {
      PostalAddress: {
        streetAddress: 'Youngstorget 3',
        addressLocality: 'Oslo',
        addressRegion: null,
        postalCode: '0181',
        addressCountry: 'Norway',
      },
    },
    geopoint: { lat: 59.914322, lng: 10.749272 },
  },
];

describe('sortArrayOfObjsByKey', () => {
  it(`sort array by 'title' key, ascending`, () => {
    const testInput = sortArrayOfObjsByKey(unsortedArray, 'title', 'asc');
    const testOutput = sortedArray;
    expect(testInput).toEqual(testOutput);
  });
});

您可以使用最简单的方式:Lodash

(https://lodash.com/docs/4.17.10#orderBy)

此方法类似于_.sortBy,只是它允许指定要排序的迭代项的排序顺序。如果未指定顺序,则所有值都按升序排序。否则,为相应值的降序指定“desc”,为升序指定“asc”。

论据

collection(Array | Object):要迭代的集合。[iteratees=[_.identity]](数组[]|函数[]|对象[]|字符串[]):要排序的iterates。[orders](string[]):迭代的排序顺序。

退换商品

(Array):返回新的排序数组。


var _ = require('lodash');
var homes = [
    {"h_id":"3",
     "city":"Dallas",
     "state":"TX",
     "zip":"75201",
     "price":"162500"},
    {"h_id":"4",
     "city":"Bevery Hills",
     "state":"CA",
     "zip":"90210",
     "price":"319250"},
    {"h_id":"6",
     "city":"Dallas",
     "state":"TX",
     "zip":"75000",
     "price":"556699"},
    {"h_id":"5",
     "city":"New York",
     "state":"NY",
     "zip":"00010",
     "price":"962500"}
    ];
    
_.orderBy(homes, ['city', 'state', 'zip'], ['asc', 'desc', 'asc']);

使用xPrototype的sortBy:

var o = [
  { Name: 'Lazslo', LastName: 'Jamf'     },
  { Name: 'Pig',    LastName: 'Bodine'   },
  { Name: 'Pirate', LastName: 'Prentice' },
  { Name: 'Pag',    LastName: 'Bodine'   }
];


// Original
o.each(function (a, b) { console.log(a, b); });
/*
 0 Object {Name: "Lazslo", LastName: "Jamf"}
 1 Object {Name: "Pig", LastName: "Bodine"}
 2 Object {Name: "Pirate", LastName: "Prentice"}
 3 Object {Name: "Pag", LastName: "Bodine"}
*/


// Sort By LastName ASC, Name ASC
o.sortBy('LastName', 'Name').each(function(a, b) { console.log(a, b); });
/*
 0 Object {Name: "Pag", LastName: "Bodine"}
 1 Object {Name: "Pig", LastName: "Bodine"}
 2 Object {Name: "Lazslo", LastName: "Jamf"}
 3 Object {Name: "Pirate", LastName: "Prentice"}
*/


// Sort by LastName ASC and Name ASC
o.sortBy('LastName'.asc, 'Name'.asc).each(function(a, b) { console.log(a, b); });
/*
 0 Object {Name: "Pag", LastName: "Bodine"}
 1 Object {Name: "Pig", LastName: "Bodine"}
 2 Object {Name: "Lazslo", LastName: "Jamf"}
 3 Object {Name: "Pirate", LastName: "Prentice"}
*/


// Sort by LastName DESC and Name DESC
o.sortBy('LastName'.desc, 'Name'.desc).each(function(a, b) { console.log(a, b); });
/*
 0 Object {Name: "Pirate", LastName: "Prentice"}
 1 Object {Name: "Lazslo", LastName: "Jamf"}
 2 Object {Name: "Pig", LastName: "Bodine"}
 3 Object {Name: "Pag", LastName: "Bodine"}
*/


// Sort by LastName DESC and Name ASC
o.sortBy('LastName'.desc, 'Name'.asc).each(function(a, b) { console.log(a, b); });
/*
 0 Object {Name: "Pirate", LastName: "Prentice"}
 1 Object {Name: "Lazslo", LastName: "Jamf"}
 2 Object {Name: "Pag", LastName: "Bodine"}
 3 Object {Name: "Pig", LastName: "Bodine"}
*/

下划线.js

使用Undercore.js]。它很小,非常棒。。。

sortBy_.sortBy(列表,迭代器,[context])返回列表,按运行每个值的结果升序排列通过迭代器。迭代器也可以是属性的字符串名称按(例如长度)排序。

var objs = [
  { first_nom: 'Lazslo',last_nom: 'Jamf' },
  { first_nom: 'Pig', last_nom: 'Bodine'  },
  { first_nom: 'Pirate', last_nom: 'Prentice' }
];

var sortedObjs = _.sortBy(objs, 'first_nom');

这将按照按字母数字顺序传递给它的属性对两级嵌套数组进行排序。

function sortArrayObjectsByPropAlphaNum(property) {
    return function (a,b) {
        var reA = /[^a-zA-Z]/g;
        var reN = /[^0-9]/g;
        var aA = a[property].replace(reA, '');
        var bA = b[property].replace(reA, '');

        if(aA === bA) {
            var aN = parseInt(a[property].replace(reN, ''), 10);
            var bN = parseInt(b[property].replace(reN, ''), 10);
            return aN === bN ? 0 : aN > bN ? 1 : -1;
        } else {
            return a[property] > b[property] ? 1 : -1;
        }
    };
}

用法:

objs.sort(utils.sortArrayObjectsByPropAlphaNum('last_nom'));