How to tile the data of bifurcation tree structure

title 

var tree = [
      {
        name:"a",
        children:[
            {
                name:"aa",
                children:[
                    {
                        name:"aaa"
                    },
                    {
                        name:"aaa1"
                    },
                    {
                        name:"aaa2"
                    },
                    {
                        name:"aaa3"
                    }
                ]
            },
            {
                name:"aa1",
                children:[
                    {
                        name:"aaaa1"
                    },
                    {
                        name:"aaaa2"
                    }
                ]
            }
        ]
    },
    {
        name:"b",
        children:[
            {
                name:"bb",
                children:[
                    {
                        name:"bbb",
                        children:[
                            {
                                name:"bbbb1"
                            }
                        ]
                    },
                    {
                        name:"bbb1"
                    },
                    {
                        name:"bbb2"
                    },
                    {
                        name:"bbb3"
                    }
                ]
            }
        ]
    }
]

requirements
returns an array of each level 

[
    ["a"],
    ["b"],
    ["a","aa"],
    ["a","aa1"],
    ["a","aa","aaa"],
    ["a","aa","aaa1"],
    ["a","aa","aaa2"],
    ["a","aa","aaa3"],
    ["a","aa1","aaaa1"],
    ["a","aa1","aaaa2"],
    ["b","bb"],
    ["b","bb","bbb"],
    ["b","bb","bbb1"],
    ["b","bb","bbb2"],
    ["b","bb","bbb3"],
    ["b","bb","bbb","bbbb1"]
]
Javascript jquery
May.22,2021
The

code comes step by step, of course, traversing the print, and then the output meets the standard. In the end, the order is the same. 

var log = (_tree,_parent = []) => {
    _tree.forEach((item)=>{
        console.log(_parent.concat(item.name));
    });
    _tree.forEach((item)=>{
        item.children && log(item.children, _parent.concat(item.name))
    })
}
log(tree)

clipboard.png

clipboard.png

clipboard.png

Previous: Js timer cannot be cleared in WeChat Work H5 interface

Next: Vue exercise project (on github), after I npm run dev, 4 kinds of logs, I would like to ask you, why the log output is not the same?

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-64f5-1e48c9d-44ce5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e48c9d-44ce5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?