Getting started with Recursion – Create A Hierarchy Structure Using Recursion [JavaScript]

var directories = [
  {name: 'users' , parent : null },
  {name: 'distalx' , parent : 'users' },
  {name: 'guest' , parent : 'users' },
  {name: 'shared' , parent : 'users' },
  {name: 'documents' , parent : 'distalx' },
  {name: 'music' , parent : 'distalx' },
  {name: 'desktop' , parent : 'distalx' },
  {name: 'javascript' , parent : 'documents' },
  {name: 'funjs' , parent : 'documents' },
  {name: 'functions' , parent : 'documents' }
]


var sortDirectories= function(directories, parent){
  let node = [];
  directories
  .filter(function(d){ return d.parent === parent})
  .forEach(function(d){
    var cd = d;
    cd.child = sortDirectories(directories, d.name);
    return node.push(cd);
  })
  return node;
}

var results = sortDirectories(directories, null);
JSON.stringify(results, null, ' ');

output


[{
  "name": "users",
  "parent": null,
  "child": [
      { "name": "distalx",
        "parent": "users",
        "child": [
            { "name": "documents",
              "parent": "distalx",
              "child": [
                  { "name": "javascript",
                    "parent": "documents",
                    "child": []
                  },
                  { "name": "funjs",
                    "parent": "documents",
                    "child": []
                  },
                  { "name": "functions",
                    "parent": "documents",
                    "child": []
                  }
              ]
            },
            { "name": "music",
              "parent": "distalx",
              "child": []
            },
            { "name": "desktop",
              "parent": "distalx",
              "child": []
            }
        ]
      },
      {
        "name": "guest",
        "parent": "users",
        "child": []
      },
      {
        "name": "shared",
        "parent": "users",
        "child": []
      }
  ]
}]

if you want to reproduce, please indicate the source:
Getting started with Recursion – Create A Hierarchy Structure Using Recursion [JavaScript] - CodeDay