Js array processing, object adding properties, array processing into objects

1. This is the

returned by the background. 
var b = [{
          channelCategoryName: "",
          channelDetailName: [
            "B",
            "C"
          ]},
          {
            channelCategoryName: "",
            channelDetailName: [
              ""
            ]
         }]

2. This is what I need 

var b = [{
            value:"",
            label:"",
            children:[{
                value:"B",
                label:"B"
            },{
                value:"C",
                label:"C"
            }]
        },{
            value:"",
            label:"",
            children:[{
                value:"",
                label:""
            }]
        }]

turn an into b and ask for advice.

Javascript
Feb.25,2022 
    b.map(item => {
     return {
         value: item.channelCategoryName,
         label: item.channelCategoryName,
         children: item.channelDetailName.map(_item => {
             return {
                 value: _item,
                 label: _item
             }
         })
       }
 })

active use of map is very important

upstairs is right, it is a two-layer loop:

  1. the outermost loop is used to build the final array to be obtained
  2. Inner loop is used to build children

if the landlord is not used to the new syntax of es6 , you can also use the syntax of es5 : 

var ret = [];
for (var i in b){
    var 
        item = b[i], 
        tmp={
                value: item.channelCategoryName,
                label: item.channelCategoryName,
                children: []
            };
    
    for (var j in item.channelDetailName) {
        var cItem = item.channelDetailName[j];
        tmp.children.push({
            value: item.channelCategoryName,
            label: item.channelCategoryName,
        });
    }

    ret.push(tmp);
}
console.log(ret)

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b32960-2be0b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b32960-2be0b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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