这段 if...else 有优雅的写法吗？

[waiaan]

    function onSortChange({ order, prop }) {
      let sortType = 0
      if (order === 'descending') {
        if (prop === 'thisYearIncome') {
          sortType = 1
        }
        if (prop === 'lastYearIncome') {
          sortType = 3
        }
        if (prop === 'rate') {
          sortType = 5
        }
      } else {
        if (prop === 'thisYearIncome') {
          sortType = 2
        }
        if (prop === 'lastYearIncome') {
          sortType = 4
        }
        if (prop === 'rate') {
          sortType = 6
        }
      }
      this.fetchData(sortType)
    }

谢谢。

[Ericcccccccc]

我感觉最多搞个 map 套一下 prop 和 sortType

外层的 if else 逻辑清晰不用改吧。

[ma836323493]

简单 枚举套枚举

[ajaxgoldfish]

没事，无伤大雅，大道至简，要是再多的话，switch case 走一个

[2kCS5c0b0ITXE5k2]

```
function onSortChange({ order, prop }) {
const sortMapping = {
descending: {
thisYearIncome: 1,
lastYearIncome: 3,
rate: 5
},
ascending: {
thisYearIncome: 2,
lastYearIncome: 4,
rate: 6
}
};

// Get the sort type from the mapping based on the order and property
const sortType = sortMapping[order][prop] || 0; // Default to 0 if not found

this.fetchData(sortType);
}

```

[pkokp8]

map? 不会 js ，大概这个意思
sortTypeMap[order][prop]=0-6
fetchData(sortTypeMap[order][prop])

[pkokp8]

另外，第二层的第 2/3 个 if 少了 else ，会多两次判断，js 应该也支持 else if

[tomatocici2333]

switch case 呗 = =看着不累

[lingyi95]

你去问 gpt ，它可以给你优化成 10 行代码

[mowen1992]

通义灵码来了：
function onSortChange({ order, prop }) {
// 使用映射对象来简化条件判断逻辑
const sortOrders = {
'thisYearIncome': { descending: 1, ascending: 2 },
'lastYearIncome': { descending: 3, ascending: 4 },
'rate': { descending: 5, ascending: 6 },
};

try {
// 检查 prop 是否存在于映射对象中
if (!sortOrders.hasOwnProperty(prop)) {
throw new Error(`Invalid property: ${prop}`);
}

// 检查 order 是否有效
if (!sortOrders[prop].hasOwnProperty(order)) {
throw new Error(`Invalid order: ${order}`);
}

// 直接通过映射对象获取 sortType
const sortType = sortOrders[prop][order];

// 调用 fetchData 方法更新数据
this.fetchData(sortType);
} catch (error) {
console.error('Error in onSortChange:', error.message);
// 可以在这里添加额外的错误处理，例如通知用户或记录日志
}
}

[Kakaaa]

有

[xiangyuecn]

var order="xxx",prop="rate"
var sortType=(
/**/ ({descending:
/*----*/ {thisYearIncome:1,lastYearIncome:3,rate:5}
/**/ })[order] ||
/*----*/ {thisYearIncome:2,lastYearIncome:4,rate:6}
)[prop]||0;

[davin]

先定义枚举吧，不然时间久了怎么解释这些 1 到 6
···
enum SortType {
THIS_YEAR_INCOME_DESC = 1,
THIS_YEAR_INCOME_ASC = 2,
LAST_YEAR_INCOME_DESC = 3,
LAST_YEAR_INCOME_ASC = 4,
RATE_DESC = 5,
RATE_ASC = 6
}
···

[yangg]

接口设计有问题，搞什么 1 ，2,3 ，4,5,6 的参数

[bertonzh]

{
'descending-thisYearIncome': 1,
'descending-lastYearIncome': 3,
}[`${order}-${prop}`]

[43n5Z6GyW39943pj]

function onSortChange({ order, prop }) {
const sortMap = {
'descending': { 'thisYearIncome': 1, 'lastYearIncome': 3, 'rate': 5 },
'ascending': { 'thisYearIncome': 2, 'lastYearIncome': 4, 'rate': 6 }
};

const sortType = sortMap[order]?.[prop] || 0;

this.fetchData(sortType);
}

[yuzo555]

function onSortChange({ order, prop }) {
const sortTypes = {
thisYearIncome: order === 'descending' ? 1 : 2,
lastYearIncome: order === 'descending' ? 3 : 4,
rate: order === 'descending' ? 5 : 6,
};
this.fetchData(sortTypes[prop] || 0);
}

[foolnius]

const defineObject = {
descending_thisYearIncome: 1, //注释
thisYearIncome: 3, //注释
descending_lastYearIncome: 3, //注释
lastYearIncome: 4, //注释
descending_rate: 5, //注释
rate: 6, //注释
};

function onSortChange({ order, prop }) {
const key = `${order === "descending" ? `${order}_` : ""}${prop}`;
this.fetchData(defineObject[key] ?? 0);
}

[NessajCN]

function onSortChange({ order, prop }) {
const l=["thisYearIncome", "lastYearIncome", "rate"];
const sortType = order === "descending" ? l.indexOf(prop)*2+1 : l.indexOf(prop)*2+2;
this.fetchData(sortType)
}

[wysnxzm]

switch 或者 map
各种设计模式最终也都是依赖 map 进行实现比如策略模式

[z1829909]

举手提问, 这里为啥需要转成数字传入 fetchData, 为什么不在这一层直接转为查询条件传入 fetchData.
因为我觉得 sortType 在 fetchData 中又要被拆开解析, 看代码的人又要去记 sortType 的意思, 多一层开销

[foolnius]

@foolnius #17
"thisYearIncome: 3, //注释" => "thisYearIncome: 2, //注释"

[makejohn2015]

function onSortChange({ order, prop }) {
const sortMap = {
thisYearIncome: { ascending: 2, descending: 1 },
lastYearIncome: { ascending: 4, descending: 3 },
rate: { ascending: 6, descending: 5 }
};

const sortType = sortMap[prop] ? sortMap[prop][order] : 0;
this.fetchData(sortType);
}

[InkStone]

fetchData 的参数设计太烂了。这种设计字段一变动直接 gg 。排序这种场景就应该直接根据传入的字段动态生成 query 。

[Track13]

function onSortChange({ order, prop }) {
const sortTypes = {
'thisYearIncome': {
ascending: 2,
descending: 1,
},
'lastYearIncome': {
ascending: 4,
descending: 3,
},
'rate': {
ascending: 6,
descending: 5,
},
};

const sortType = sortTypes[prop][order];
this.fetchData(sortType);
}

[renmu]

我选择 switch

[ChefIsAwesome]

不得不说，chatgpt 给的答案可读性强，易扩展，非常好。

[Pencillll]

好像楼上都没有提到这种写法啊，感觉这样更清晰一些：

const sortTypes = {
1: { prop: "thisYearIncome", order: "descending" },
2: { prop: "thisYearIncome", order: "ascending" },
3: { prop: "lastYearIncome", order: "descending" },
4: { prop: "lastYearIncome", order: "ascending" },
5: { prop: "rate", order: "descending" },
6: { prop: "rate", order: "ascending" },
}

function getSortType({ order, prop }) {
for (const [sortType, condition] of Object.entries(sortTypes)) {
if (condition.order === order && condition.prop === prop) {
return sortType
}
}

return 0
}

[qinxs]

如果 135 246 是固定的值

function onSortChange({ order, prop }) {
let sortType = 0
const sortMap = {
thisYearIncome: 1,
lastYearIncome: 3,
rate: 5,
}

sortType = sortMap[prop] || sortType
if (order !== 'descending' && sortMap.hasOwnProperty(prop)) {
sortType++
}
console.log(sortType)
// this.fetchData(sortType)
}

[wildnode]

const sortTypeMap = {
descending: {
thisYearIncome: 1,
lastYearIncome: 3,
rate: 5
},
ascending: {
thisYearIncome: 2,
lastYearIncome: 4,
rate: 6
}
}

function onSortChange({ order, prop }) {
const sortType = sortTypeMap?.[order]?.[prop] ?? 0
this.fetchData(sortType)
}

[ZnductR0MjHvjRQ3]

能否改成这样呢？
```js
function onSortChange({ order, prop }) {
let sortType = 0;
const data = {
descending: {
thisYearIncome: 1,
lastYearIncome: 3,
rate: 5,
},
default: {
thisYearIncome: 2,
lastYearIncome: 4,
rate: 6,
},
};
if (!data[order]) order = "default";
this.fetchData(data[order][prop]);
}

```

[z1154505909]

def test(order,prop):
arr={
'descending':{
"thisYearIncome":1,
"lastYearIncome":3,
"rate":5
},
"thisYearIncome":2,
"lastYearIncome":4,
"rate":6
}

try:
return arr[order][prop]
except:
return arr[prop]
python 写法

[sima675]

function onSortChange({ order, prop }) {
const sortMap = {
'thisYearIncome': {
'descending': 1,
'ascending': 2
},
'lastYearIncome': {
'descending': 3,
'ascending': 4
},
'rate': {
'descending': 5,
'ascending': 6
}
};

const sortType = sortMap[prop][order];
this.fetchData(sortType);
}
gpt 给的答案，看着还行

[darkengine]

const arr = ['thisYearIncome', 'lastYearIncome', "rate']

return (arr.indexOf(prop) + 1) * 2 - (order==='descending'?1:0)


你这样写，看同事揍不揍就完了 😂

[maigebaoer]

扔给 gpt 吧

[wuyiccc]

order_prop 组成 map 的 key ，value 存放 sortType, 然后需要的时候根据 order_prop 这个 key 直接去 get 就可以了

[secondwtq]

我怎么感觉如果这是 C/C++ 的代码的话，主楼原本的写法就挺好的 ...

[Lax]

怀疑紧接着还有一段对应的代码：

function fetchData(sortType) {
let prop = null;
let order = null;

if(sortType === 1) {
prop = "thisYearIncome";
order = "descending";
}
if(sortType === 2) {
prop = "...";
order = "...";
}
if(sortType === 3) {
prop = "...";
order = "...";
}
if(sortType === 4) {
prop = "...";
order = "...";
}
if(sortType === 5) {
prop = "...";
order = "...";
}
if(sortType === 6) {
prop = "...";
order = "...";
}

// do something
}

[cookii]

@darkengine 这么多答案我还是喜欢你这个

[bidongliang]

@darkengine 果然找到了心目中的答案

[lanlanye]

```javascript
class SortService {
getSortType(sort) {
const mapping = {
thisYearIncome: {
ascending: 2,
descending: 1,
},
lastYearIncome: {
ascending: 4,
descending: 3,
},
rate: {
ascending: 6,
descending: 5,
},
};
return mapping[sort.sortBy][sort.sortOrder];
}
}


function onSortChange({ order, prop }) {
const sort = new Sort(prop, order);
const sortType = new SortService().getSortType(sort);
this.fetchData(sortType);
}
```

[hefish]

我怎么觉着 op 的代码挺顺眼的？ 反而是各位大佬回复的代码，看着不够顺。。。

[leconio]

const sortStrategies = {
descending: (prop) => (a, b) => b[prop] - a[prop],
ascending: (prop) => (a, b) => a[prop] - b[prop]
};

const sortCommands = {
thisYearIncome: {
descending: () => sortStrategies.descending('thisYearIncome'),
ascending: () => sortStrategies.ascending('thisYearIncome')
},
lastYearIncome: {
descending: () => sortStrategies.descending('lastYearIncome'),
ascending: () => sortStrategies.ascending('lastYearIncome')
},
rate: {
descending: () => sortStrategies.descending('rate'),
ascending: () => sortStrategies.ascending('rate')
}
};

function createSortCommand(order, prop) {
return sortCommands[prop][order]();
}

const data = [
{ thisYearIncome: 5000, lastYearIncome: 4000, rate: 0.25 },
{ thisYearIncome: 8000, lastYearIncome: 6000, rate: 0.33 },
{ thisYearIncome: 3000, lastYearIncome: 2000, rate: 0.5 },
{ thisYearIncome: 6000, lastYearIncome: 5000, rate: 0.2 }
];

function onSortChange(order, prop) {
const sortCommand = createSortCommand(order, prop);
fetchData(sortCommand);
}

function fetchData(sortCommand) {
const sortedData = data.sort(sortCommand);

console.log('Sorted Data:');
sortedData.forEach((item) => {
console.log(`This Year Income: ${item.thisYearIncome}, Last Year Income: ${item.lastYearIncome}, Rate: ${item.rate}`);
});
}

console.log('Sorting by This Year Income (Descending):');
onSortChange('descending', 'thisYearIncome');

console.log('\nSorting by Last Year Income (Ascending):');
onSortChange('ascending', 'lastYearIncome');

console.log('\nSorting by Rate (Descending):');
onSortChange('descending', 'rate');

[AlexTCX]

function onSortChange({ order, prop }) {
const sortTypes = {
descending: {
thisYearIncome: 1,
lastYearIncome: 3,
rate: 5
},
ascending: {
thisYearIncome: 2,
lastYearIncome: 4,
rate: 6
}
};

const sortType = sortTypes[order][prop] || 0;
this.fetchData(sortType);
}

[mingl0280]

const props=['thisYearIncome','lastYearIncome','rate']
function onSortChange({ order, prop })
{
let b=order=== 'descending'?-1:0;
return this.fetchData(props.IndexOf(prop)*2+b); //如果 JS 的 IndexOf 可以这么用的话
}

[mingl0280]

上面打错了，修正
const props=['thisYearIncome','lastYearIncome','rate']
function onSortChange({ order, prop })
{
let b=order=== 'descending'?-1:0;
return this.fetchData((props.findIndex(prop)+1)*2+b); //查了，不是 indexof
}

[nekochyan]

如果是业务代码，我可能就这么写了，简单清晰明了，后续修改也方便；如果是自己项目，可能会优化成 map 去实现

[YuCH]

可以看下这篇文章，讲的挺好的 https://dreith.com/blog/theres-such-a-thing-as-using-too-many-ifs/

[lalalalacc]

```
function onSortChange({ order, prop }) {
const propSortTypeMap = {
thisYearIncome: 0, // 基础值，用于计算排序类型
lastYearIncome: 2,
rate: 4
};

// 计算基础排序类型，如果属性不匹配，则默认为 0
let baseSortType = propSortTypeMap[prop] || 0;

// 根据排序顺序调整排序类型
let sortTypeAdjustment = order === 'descending' ? 1 : 2;

// 计算最终的排序类型
let sortType = baseSortType + sortTypeAdjustment;

// 调用 fetchData 函数
this.fetchData(sortType);
}
```

[leonshaw]

function fetchData({ order, prop })

[lalalalacc]

function onSortChange({ order, prop }) {
// 定义属性到排序类型映射的基础值
const baseSortTypes = {
thisYearIncome: 1,
lastYearIncome: 3,
rate: 5
};

// 使用数组处理升序和降序的逻辑，0 索引用于升序，1 索引用于降序
const orderAdjustments = { ascending: 1, descending: 0 };

// 计算最终的排序类型
let sortType = baseSortTypes[prop] + (orderAdjustments[order] || 0);

// 调用 fetchData 函数
this.fetchData(sortType);
}

[lalalalacc]

// 定义排序策略接口
class SortStrategy {
getSortType(order, prop) {
throw new Error("This method should be implemented by subclasses");
}
}

// 实现具体的排序策略
class IncomeSortStrategy extends SortStrategy {
getSortType(order, prop) {
const baseSortType = prop === 'thisYearIncome' ? 1 : 3;
return order === 'descending' ? baseSortType : baseSortType + 1;
}
}

class RateSortStrategy extends SortStrategy {
getSortType(order) {
return order === 'descending' ? 5 : 6;
}
}

// 环境类，用于使用排序策略
class SortContext {
constructor(strategy) {
this.strategy = strategy;
}

setStrategy(strategy) {
this.strategy = strategy;
}

onSortChange({ order, prop }) {
const sortType = this.strategy.getSortType(order, prop);
this.fetchData(sortType); // 假设这是一个获取数据的方法
}
}

// 使用
const incomeStrategy = new IncomeSortStrategy();
const rateStrategy = new RateSortStrategy();

const sortContext = new SortContext(incomeStrategy); // 初始使用收入排序策略
sortContext.onSortChange({ order: 'descending', prop: 'thisYearIncome' });

sortContext.setStrategy(rateStrategy); // 切换到利率排序策略
sortContext.onSortChange({ order: 'ascending', prop: 'rate' });

[foam]

@hefish 因为他们开始整活了。别搞那些花里胡哨的，用一个 map 做配置就行了。

[fox0001]

@Ericcccccccc #1 我也是第一时间想到 map

[fox0001]

这段代码最大问题是，第二层的 if ，居然没有写成 if…else if…else 的形式

[DOLLOR]

@darkengine
这样写可能清晰一些
function toSortType({ order, prop }) {
const orderType = (order === 'descending') ? (1) : (2);
// 0,2,4 or -2
let sortType = ['thisYearIncome', 'lastYearIncome', 'rate'].indexOf(prop) * 2;
if (sortType < 0) {
return 0;
}
// 1,3,5 or 2,4,6
sortType = sortType + orderType;
return sortType;
}

[weeei]

function onSortChange({ order, prop }) {
var map = new Map(
[
['descending-thisYearIncome', 1], ['descendinglastYearIncome', 3], ['descendingrate', 5],
['ascending-thisYearIncome', 2], ['ascending-lastYearIncome', 4], ['ascending-rate', 6]
])
var sortType = map.get('descending' + '-' + 'thisYearIncome')
this.fetchData(sortType)
}

[weeei]

```js
function onSortChange({ order, prop }) {
var map = new Map(
[
['descending-thisYearIncome', 1], ['descending-lastYearIncome', 3], ['descending-rate', 5],
['ascending-thisYearIncome', 2], ['ascending-lastYearIncome', 4], ['ascending-rate', 6]
])
var sortType = map.get(order + '-' + prop)
this.fetchData(sortType)
}
```

[anjingdexiaocai]

先解决最基本的魔数问题再说😂

[libook]

我会选择用类 map 对象。

[egoistttt]

function onSortChange({ order, prop }) {
const sortOrderMap = {
'thisYearIncome': { 'ascending': 2, 'descending': 1 },
'lastYearIncome': { 'ascending': 4, 'descending': 3 },
'rate': { 'ascending': 6, 'descending': 5 },
};

const sortType = sortOrderMap[prop][order];
if (sortType !== undefined) {
this.fetchData(sortType);
} else {
// 如果 prop 或 order 的组合不在预期中，可以处理错误情况或者默认行为
console.error('Invalid sorting property or order');
}
}

[kinge]

优雅的代码不易于阅读,这样就很好

[ntedshen]

map=new map([
['desc_tyi',1],
['desc_lyi',3],
['desc_r',5],
])

function onSortChange({ order, prop })
key=[order,pop].join('_')
type=map.get(key)??0
this.fetchData(sortType)

[lDqe4OE6iOEUQNM7]

function onSortChange({ order, prop }) {
const sortMap = {
descending: {
thisYearIncome: 1,
lastYearIncome: 3,
rate: 5
},
ascending: {
thisYearIncome: 2,
lastYearIncome: 4,
rate: 6
}
};

const sortType = sortMap[order][prop] || 0; // 如果没有匹配到，则默认为 0
this.fetchData(sortType);
}

[incubus]

function onSortChange({ order, prop }) {
const sortTypeMap = {
'thisYearIncome': { 'descending': 1, 'ascending': 2 },
'lastYearIncome': { 'descending': 3, 'ascending': 4 },
'rate': { 'descending': 5, 'ascending': 6 }
};

const sortType = sortTypeMap[prop][order];
this.fetchData(sortType);
}

[FYFX]

你是 order2 种值，prop 3 种值组合总共 6 种，我是觉得把 6 种可能枚举出来比较好，先判断 order 再判断 prop 感觉没那么清晰

[mrytsr]

没搞懂为什么要把 prop 和 order 转成 sorttype ，建议直接存储或传输 prop,order

[pennai]

1.可以配在 db 里，这样一行查 db 然后一行赋值 sort type 就行
2.策略模式实现
3.上规则引擎

[nuk]

let sortType = order === 'descending'?prop === 'thisYearIncome'?1:prop === 'lastYearIncome'? 3:prop === 'rate'?5:0:prop === 'thisYearIncome'?2:prop === 'lastYearIncome'?4:prop === 'rate'?6:0

[shyangs]

@z1829909

'''
> 举手提问, 这里为啥需要转成数字传入 fetchData, 为什么不在这一层直接转为查询条件传入 fetchData.
因为我觉得 sortType 在 fetchData 中又要被拆开解析, 看代码的人又要去记 sortType 的意思, 多一层开销
'''

z1829909 說的對，原本 order, prop 不是魔法數字 (magic number)，經過 onSortChange 反而變成魔術數字了.

onSortChange 根本就是多餘的，fetchData 直接傳入 order, prop 即可. 呼叫者直接調用 fetchData 即可.

[walkerliu]

评论里的反向优化看醉了..........。OP 的代码逻辑清晰， 可读性强，也没性能问题。 评论里面又是匿名函数又是三目运算符的.. 这不妥妥的反向优化嘛

[cpstar]

全都是优雅 order 和 prop 的，窃以为问题的根源在 0123456
如果真的要优雅，应该多态到头，连带 fetchData 做到多态

[amlee]

我不懂为什么接口要单独定义一个 sortType ，直接 fetchData(order, prop)不就好了？后端也简单前端也简单。

[zcm3579]

你这边前端转成数字 , 后端接口拿到后是不是又转回字段和 order

[pytth]

使用对象映射法：

```
function onSortChange({ order, prop }) {
const propMap = {
thisYearIncome: {
descending: 1,
ascending: 2
},
lastYearIncome: {
descending: 3,
ascending: 4
},
rate: {
descending: 5,
ascending: 6
}
};

const sortType = propMap[prop][order];
this.fetchData(sortType);
}
```

[bv]

下面这样，有点为了优化而优化，让人难以理解了：
function onSortChange(order, prop) {
let props = new Map([
["thisYearIncome", 1],
["lastYearIncome", 3],
["rate", 5],
]);

this.fetchData((order === "descending" ? 0 : 1) + props.get(prop))
}

[netabare]

表驱动。