Javascript - 我想用多个条件对数组进行排序

Question

假设我有这个数组：

const services = [
    { id: 100, priority: 'Y', count: 300, payout: '30', id_region: 137 },
    { id: 101, priority: 'N', count: 200, payout: '40', id_region: 153 },
    { id: 102, priority: 'Y', count: 400, payout: '30', id_region: 137 },
    { id: 103, priority: 'Y', count: 500, payout: '50', id_region: 153 },
    { id: 104, priority: 'Y', count: 800, payout: '80', id_region: 222 }
];

这个全局变量：

var regionsFound = ['153'];

我要排序：

• 首先是 id_region（如果它出现在regionsFound中）
• 然后优先考虑“Y”
• 然后是最高赔付
• 然后是 id_region（如果没有出现在regionsFound中）
• 然后数数

这是我的代码：

services.sort((a, b) => {
 if (regionsFound.indexOf(a.id_region.toString()) >= 0 && regionsFound.indexOf(b.id_region.toString()) >= 0){
    if (a.priority == 'Y' && b.priority == 'N'){
        return -1;
    } else if (a.priority == 'N' && b.priority == 'Y'){
        return 1;
    }
    return b.payout - a.payout;    
 } else if (regionsFound.indexOf(a.id_region.toString()) >= 0 && regionsFound.indexOf(b.id_region.toString()) < 0){
    return -1;
 } else {
    return b.count - a.count; 
 }
});

所以结果应该是：

const services = [
    { id: 103, priority: 'Y', count: 500, payout: '50', id_region: 153 },
    { id: 101, priority: 'N', count: 200, payout: '40', id_region: 153 },
    { id: 104, priority: 'Y', count: 800, payout: '80', id_region: 222 },
    { id: 102, priority: 'Y', count: 400, payout: '30', id_region: 137 },
    { id: 100, priority: 'Y', count: 300, payout: '30', id_region: 137 }
];

不知道错在哪里。

Answer 1

你差不多已经完成了，你只需要先将

payout

值转换为数字，然后才能正确排序。

我还更改了

indexof

为

include

以获得更清晰的代码

const services = [
    { id: 100, priority: 'Y', count: 300, payout: '30', id_region: 137 },
    { id: 101, priority: 'N', count: 200, payout: '40', id_region: 153 },
    { id: 102, priority: 'Y', count: 400, payout: '30', id_region: 137 },
    { id: 103, priority: 'Y', count: 500, payout: '50', id_region: 153 },
    { id: 104, priority: 'Y', count: 800, payout: '80', id_region: 222 }
];

var regionsFound = ['153'];

services.sort((a, b) => {
    const aRegionFound = regionsFound.includes(a.id_region.toString());
    const bRegionFound = regionsFound.includes(b.id_region.toString());

    if (aRegionFound && bRegionFound) {
        if (a.priority === 'Y' && b.priority === 'N') {
            return -1;
        } else if (a.priority === 'N' && b.priority === 'Y') {
            return 1;
        }
        return parseInt(b.payout) - parseInt(a.payout);
    } else if (aRegionFound && !bRegionFound) {
        return -1;
    } else if (!aRegionFound && bRegionFound) {
        return 1;
    } else {
        return b.count - a.count;
    }
});

console.log(services)

Answer 2

我认为如果你不嵌套 if 语句，你会省去很多麻烦。像这样的事情应该可以解决问题：

const services = [
    { id: 100, priority: 'Y', count: 300, payout: '30', id_region: 137 },
    { id: 101, priority: 'N', count: 200, payout: '40', id_region: 153 },
    { id: 102, priority: 'Y', count: 400, payout: '30', id_region: 137 },
    { id: 103, priority: 'Y', count: 500, payout: '50', id_region: 153 },
    { id: 104, priority: 'Y', count: 800, payout: '80', id_region: 222 }
];
var regionsFound = ['153'];

services.sort((a, b) => {
    // first the id_region if that appears in regionsFound
    const aInRegionsFound = regionsFound.includes(String(a.id_region));
    const bInRegionsFound = regionsFound.includes(String(a.id_region));

    if (aInRegionsFound !== bInRegionsFound) return aInRegionsFound ? -1 : 1;

    // then priority 'Y' first
    if (a.priority !== b.priority) return a.priority === 'Y' ? -1 : 1;

    // then highest payout
    if (a.payout !== b.payout) return Number(a.payout) > Number(b.payout) ? -1 : 1;

    // then the id_region if that doesn't appear in regionsFound
    if (a.id_region !== b.id_region) return a.id_region < b.id_region ? -1 : 1;

    // then count
    return a.count - b.count
});