tree

A module that provides a tree structure and methods to manipulate the structure.

It also provides an easy way to convert between tree struture and array.

Install

This package is only served through OpenBits.

To install OpenBits run:

npm install openbits -g

Then login into openbits by following these instructions.

When OpenBits is set up, then install tree as followings:

openbits install tree-lib

Usage

Import the package:

import tree from 'tree-lib';

Create a new Tree:

let worldMapTree = new tree.Tree();

Add some nodes to the tree:

worldMapTree.append(new tree.Node({id: 1,name: "Europe"}));
worldMapTree.append(new tree.Node({id: 2,name: "Africa"}));
worldMapTree.append(new tree.Node({id: 3,name: "America"}));
worldMapTree.append(new tree.Node({id: 4,name: "Australia"}));
worldMapTree.append(new tree.Node({id: 5,name: "Antarctica"}));

worldMapTree.insert(new tree.Node({id: 6,name: "Portugal"}) , 1 );
worldMapTree.insert(new tree.Node({id: 7,name: "Spain"}), 1 );
worldMapTree.insert(new tree.Node({id: 8,name: "France"}), 1 );

worldMapTree.insert(new tree.Node({id: 9,name: "Egypt"}), 2 );
worldMapTree.insert(new tree.Node({id: 10,name: "South Africa"}), 2 );

worldMapTree.insert(new tree.Node({id: 11,name: "Angola"}), 2 );
worldMapTree.insert(new tree.Node({id: 12,name: "Cabinda"}), 11 );
worldMapTree.insert(new tree.Node({id: 13,name: "Benguela"}), 11 );

Print the tree:

worldMapTree.print();

This will output:

Root
    {"id":1,"name":"Europe"}
        {"id":6,"name":"Portugal"}
        {"id":7,"name":"Spain"}
        {"id":8,"name":"France"}
    {"id":2,"name":"Africa"}
        {"id":9,"name":"Egypt"}
        {"id":11,"name":"Angola"}
            {"id":12,"name":"Cabinda"}
            {"id":13,"name":"Benguela"}
        {"id":10,"name":"South Africa"}
    {"id":3,"name":"America"}
    {"id":4,"name":"Australia"}
    {"id":5,"name":"Antarctica"}

You can also set a tree using an array of JSONs.

Each JSON must have a parentId and a node with attribute id and any additional data.

let placesList = [
  {
    parentId: 0,
    node: {
      id: 1,
      name: "Europe"
    }
  },
  {
    parentId: 0,
    node: {
      id: 2,
      name: "America"
    }
  },
  {
    parentId: 0,
    node: {
      id: 3,
      name: "Africa"
    }
  },
  {
    parentId: 0,
    node: {
      id: 4,
      name: "Angola"
    }
  },
  {
    parentId: 1,
    node: {
      id: 5,
      name: "Spain"
    }
  },
  {
    parentId: 1,
    node: {
      id: 6,
      name: "Portugal"
    }
  }

]

let worldMapCopy = new tree.Tree();
worldMapCopy.loadFromArray(placesList); 

It is also possible to transform the tree into an array:

worldMapTree.toArray()