Help for this complex question's solution please

Back End Help
#1

Hello everyone and thanks in advance for your help if you share your time for this solution.I am currently having job interviews for front end and I came across with the question today in the interview.I could’t figure out anything. Thanks a lot.

var FileTreeNode = function(nodeId, name, type) {
  var children = [];

  this.nodeId = nodeId;
  this.name = name;
  this.type = type;
  this.parentNode = null;

  this.setParent = function(parentNode) {
    this.parentNode = parentNode;
  };
  this.addChild = function(node){
    if (this.type !== 'DIRECTORY') {
      throw "Cannot add child node to a non-directory node";
    }
    children.push(node);
    node.setParent(this);
  };
  this.getChildren = function() {
    return children;
  };
};

var FileTree = function() {
  this.nodes = [];

  this.getRootNodes = function() {
    var result = [];
    for (var i = 0; i < this.nodes.length; i++) {
      if (!this.nodes[i].parentNode) {
        result.push(this.nodes[i]);
      }
    }
    return result;
  };
  this.findNodeById = function(nodeId) {
    for (var i = 0; i < this.nodes.length; i++) {
      if (this.nodes[i].nodeId === nodeId) {
        return this.nodes[i];
      }
    }
    return null;
  };
  this.createNode = function(nodeId, name, type, parentNode) {
    var node = new FileTreeNode(nodeId, name, type);
    if (parentNode) {
      parentNode.addChild(node);
    }
    this.nodes.push(node);
  }
};

function createFileTree(input) {
  var fileTree = new FileTree();

  for (var i = 0; i < input.length; i++) {
    var inputNode = input[i];
    var parentNode = inputNode.parentId ? fileTree.findNodeById(inputNode.parentId) : null;
    fileTree.createNode(inputNode.id, inputNode.name, inputNode.type, parentNode);
  }

  return fileTree;
}
#2

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make easier to read.

See this post to find the backtick on your keyboard. The “preformatted text” tool in the editor (</>) will also add backticks around text.

Note: Backticks are not single quotes.

markdown_Forums

#3

Thank you so much :slight_smile:

#4

la solucion es esta

export function createFileTree(input) {
var fileTree = new FileTree();
var parentLinks = {};

for (const inputNode of input) {
parentLinks[inputNode.id] = inputNode.parentId ? inputNode.parentId : null;
fileTree.createNode(inputNode.id, inputNode.name, inputNode.type, null);
}

for(var nodeId in parentLinks) {
var node = fileTree.findNodeById(+nodeId);
var parentNode = fileTree.findNodeById(parentLinks[nodeId]);

if(parentNode) {
  node.setParent(parentNode);
  parentNode.addChild(node);
}

}

return fileTree;
}