在JavaScript中按字母顺序对数组及其对象键进行排序 [英] Sort array and its object key in alphabetical order in javascript

问题描述

我有一个以下格式的数组.我已经按字母顺序对数组进行了排序，但是数组中的每个元素都存在一个子数组.我也想按字母顺序对它们进行排序.

I have an array in the following format. I have sorted the array in alphabetical order.But every element in the array, a sub array exist. I would like to sort them in alphabetical order too.

var myObj = [
          {
          "name":"John",
          "items": [
              { "id":1, "car":"maruti" },  
              { "id":2, "car":"wolks" },
              { "id":3, "car":"bmw" }            
          ]},
          {
            "name":"Peter",
          "items": [
              { "id":4, "car":"alto" },  
              { "id":5, "car":"swift" },                          
          ]
       }
      ];

这是我用来对主数组进行排序的代码.在这里，我想按字母顺序对项"数组进行排序.

This is the code I have used to sort the main array. Here I would like to sort the 'items' array in alphabetical order.

 myObj.sort(function(a, b){
        var nameA=a.name.toLowerCase(), nameB=b.name.toLowerCase();          
        if (nameA < nameB) {
          return -1
        }
        if (nameA > nameB){
          return 1
        }
        return 0 
      }); 

推荐答案

在sort函数 other 中除了对数组中的直接项目进行排序以外，感觉不正确-我重复两次，一次对myObj进行排序，一次对每个items属性进行排序.

It doesn't feel right to do anything in a sort function other than sort the immediate items in the array - I'd iterate twice, once to sort the myObj, and once to sort each items property.

您还可以使用localeCompare来简化代码:

You can also use localeCompare to simplify your code:

var myObj=[{"name":"John","items":[{"id":1,"car":"maruti"},{"id":2,"car":"wolks"},{"id":3,"car":"bmw"}]},{"name":"Peter","items":[{"id":4,"car":"alto"},{"id":5,"car":"swift"},]}]
myObj.sort((a, b) => a.name.localeCompare(b.name));
myObj.forEach(({ items }) => items.sort((a, b) => a.car.localeCompare(b.car)));
console.log(myObj);

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