How to filter this array? Algorithm

let arr = [
        {
            name: "tom",
            children: [
                {name: "tomson1", age: 11},
                {name: "tomson2", age: 12}
            ]
        },
        {
            name: "tony",
            children: [
                {name: "tonyon1", age: 13},
                {name: "tonyon2", age: 14},
                {name: "tonyon3", age: 15}
            ]
        },
        {
            name: "mike",
            children: [
                {name: "mikeson1", age: 16},
                {name: "mikeson2", age: 17}
            ]
        }
    ]
    let list = [{name: "tom"},{name: "tony"}, {name: "tonyon1"}]
arrlistlistlistsonchildren



```
[
    {
        name: "tom"
    },
    {
        name: "tony",
        children: [
            {name: "tonyon1", age: 13}
        ]
    }
]
```
Javascript
Nov.02,2021 
let arr = [{
        name: 'tom',
        children: [{
                name: 'tomson1',
                age: 11
            },
            {
                name: 'tomson2',
                age: 12
            }
        ]
    },
    {
        name: 'tony',
        children: [{
                name: 'tonyon1',
                age: 13
            },
            {
                name: 'tonyon2',
                age: 14
            },
            {
                name: 'tonyon3',
                age: 15
            }
        ]
    },
    {
        name: 'mike',
        children: [{
                name: 'mikeson1',
                age: 16
            },
            {
                name: 'mikeson2',
                age: 17
            }
        ]
    }
]
let list = [{
    name: 'tom'
}, {
    name: 'tony'
}, {
    name: 'tonyon1'
}]
let newArr = []
for (let j in list) {
    for (let i in arr) {
        if (arr[i].name == list[j].name) {
            if (arr[i].children.length > 0) {
                newArr.push(arr[i])

            }
        }
    }
}
console.log('newArr: ', newArr);

newArr is the array you want?

first convert list into a two-dimensional array [{name:xxx}, {name:xxxson}] = > [[xxx,xxxson]]
convert arr to an object [{name:xxx,children: [{name:xxxson}]}] = > {xxx: {children: []}} / / you can also omit this step
, and then construct the result 

const mlist = new Map()
for (const { name } of list) {
  const m = /^(\S+?)s?on\d+$/.exec(name)
  const key = m ? m[1] : name
  const cset = mlist.get(key) || new Set()
  if (m) { cset.add(name) }
  mlist.set(key, cset)
}

const newArr = arr
  .map(({ name, children }) => {
    const cset = mlist.get(name)
    if (!cset) { return null }
    children = cset.size <= 0 || !children 
      ? []
      : children.filter(({ name }) => cset.has(name))
    return children.length > 0
      ? { name, children }
      : { name }
  })
  .filter(Boolean)
based on the two-dimensional array converted by list.

Previous: React, could you take a look at my codepen project and why React didn't render the components?

Next: Can events in the vue parent component be hung directly on the child component?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
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-64f5-1eac359-20b6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eac359-20b6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?