Question

我想知道如何在自定义订单上排序数组，而不是按字母顺序排序。想象一下，你有这个数组/对象：

var somethingToSort = [{
    type: "fruit",
    name: "banana"
}, {
    type: "candy",
    name: "twix"
}, {
    type: "vegetable",
    name: "broccoli"
}, {
    type: "vegetable",
    name: "carrot"
}, {
    type: "fruit",
    name: "strawberry"
}, {
    type: "candy",
    name: "kitkat"
}, {
    type: "fruit",
    name: "apple"
}];

在这里我们有3种不同的类型：水果，蔬菜和糖果。现在我想对这个阵列进行排序，并确保所有水果都是第一个，糖果来自水果，蔬菜是最后的。每种类型都需要按字母顺序对其项目进行排序。我们将使用像sortArrayOnOrder ( ["fruit","candy","vegetable"], "name" );这样的函数。所以基本上，你会在排序之后得到这个数组：

var somethingToSort = [{
    type: "fruit",
    name: "apple"
}, {
    type: "fruit",
    name: "banana"
}, {
    type: "fruit",
    name: "strawberry"
}, {
    type: "candy",
    name: "kitkat"
}, {
    type: "candy",
    name: "twix"
}, {
    type: "vegetable",
    name: "broccoli"
}, {
    type: "vegetable",
    name: "carrot"
}];

任何人都知道如何为此创建脚本？

Answer 1

Cerberus代码的改进版本：

var ordering = {}, // map for efficient lookup of sortIndex
    sortOrder = ['fruit','candy','vegetable'];
for (var i=0; i<sortOrder.length; i++)
    ordering[sortOrder[i]] = i;

somethingToSort.sort( function(a, b) {
    return (ordering[a.type] - ordering[b.type]) || a.name.localeCompare(b.name);
});

Answer 2

试试这个：

var sortOrder = ['fruit','candy','vegetable'];   // Declare a array that defines the order of the elements to be sorted.
somethingToSort.sort(
    function(a, b){                              // Pass a function to the sort that takes 2 elements to compare
        if(a.type == b.type){                    // If the elements both have the same `type`,
            return a.name.localeCompare(b.name); // Compare the elements by `name`.
        }else{                                   // Otherwise,
            return sortOrder.indexOf(a.type) - sortOrder.indexOf(b.type); // Substract indexes, If element `a` comes first in the array, the returned value will be negative, resulting in it being sorted before `b`, and vice versa.
        }
    }
);

此外，您的对象声明不正确。而不是：

{
    type = "fruit",
    name = "banana"
}, // etc

使用：

{
    type: "fruit",
    name: "banana"
}, // etc

因此，请将=符号替换为:。

Answer 3

Array.sort接受一个排序函数，您可以在其中应用自定义排序逻辑。

Answer 4

对于希望按自定义顺序对字符串数组进行简单排序的人，请尝试以下功能：

// sorting fn
const applyCustomOrder = (arr, desiredOrder) => {
  const orderForIndexVals = desiredOrder.slice(0).reverse();
  arr.sort((a, b) => {
    const aIndex = -orderForIndexVals.indexOf(a);
    const bIndex = -orderForIndexVals.indexOf(b);
    return aIndex - bIndex;
  });
}

// example use
const orderIWant = ['cat', 'elephant', 'dog'];
const arrayToSort = ['elephant', 'dog', 'cat'];


applyCustomOrder(arrayToSort, orderIWant);

这将按照指定的顺序对数组进行排序。此功能的两个样本输入/输出：

示例1：

const orderIWant = ['cat', 'elephant', 'dog'] 
const arrayToSort = ['mouse', 'elephant', 'dog', 'cat'];
applyCustomOrder(arrayToSort, orderIWant); 
console.log(arrayToSort); // ["cat", "elephant", "dog", "mouse"]

示例2：

const orderIWant = ['cat', 'elephant', 'dog'];
const arrayToSort = ['mouse', 'elephant', 'rabbit', 'dog', 'cat'];
applyCustomOrder(arrayToSort, orderIWant); 
console.log(arrayToSort); /* ["cat", "elephant", "dog", "mouse", 
"rabbit"] */

按自定义订单排序

4 个答案: