js 数组按指定字段转map-list结构
背景介绍
在开发过程中经常会出现接口返回整个数组,我们需要将数组进行二次处理,如下格式按照不同功能模块(type)进行数据拆分
原始数据
| const list = [ |
| {"type":"red","id":1,"name":"a","count":1}, |
| {"type":"red","id":2,"name":"b","color":2}, |
| {"type":"green","id":3,"name":"c","color":3}, |
| {"type":"green","id":4,"name":"d","color":4}, |
| {"type":"blue","id":5,"name":"e","color":4}, |
| {"type":"blue","id":6,"name":"f","color":4} |
| ]; |
转换方法
| |
| |
| |
| |
| const arrayToMap = (listData,field)=>{ |
| const arrayMap = {}; |
| listData.forEach(item => { |
| const item_type = item[field]; |
| if (!arrayMap[item_type]) { |
| arrayMap[item_type] = []; |
| } |
| |
| arrayMap[item_type].push(item); |
| }); |
| return arrayMap; |
| } |
测试验证
| console.log(arrayToMap(list,'type')) |
| { |
| "red": [ |
| { |
| "type": "red", |
| "id": 1, |
| "name": "a", |
| "count": 1 |
| }, |
| { |
| "type": "red", |
| "id": 2, |
| "name": "b", |
| "color": 2 |
| } |
| ], |
| "green": [ |
| { |
| "type": "green", |
| "id": 3, |
| "name": "c", |
| "color": 3 |
| }, |
| { |
| "type": "green", |
| "id": 4, |
| "name": "d", |
| "color": 4 |
| } |
| ], |
| "blue": [ |
| { |
| "type": "blue", |
| "id": 5, |
| "name": "e", |
| "color": 4 |
| }, |
| { |
| "type": "blue", |
| "id": 6, |
| "name": "f", |
| "color": 4 |
| } |
| ] |
| } |
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