Tree Node

Simple tree data structure in JS, designed specifically to organize related data in such a way that it can be consumed by tree diagram visualizations, and so that "leaf" nodes (endpoints) can be quickly identified.

Installation

npm install treenode --save

Usage

  // Import the class
  var TreeNode = require('treenode').TreeNode;
 
  // Create a tree by adding a single node, with a data object payload.
  // This will be the root node. tree is a TreeNode object:
  // {data: {id: 0, name: 'root'}, parent: null, children: []}
  var tree = new TreeNode({id: 0, name: 'root'});
 
  // Add children to the root. This returns the newly created child's
  // TreeNode object.
  tree.addChild({id: 1, name: 'Node 1'});
 
  // Add child nodes to child nodes
  var child = tree.addChild({id: 2, name: 'Node 2'});
  child.addChild({id: 3, name: 'Node 3' });
  
  // Get a count of the node's immediate children
  tree.numChildren() // 2
  child.numChildren() // 1
 
  // Obtain the tree's leaves (end nodes), from the point of the called node.
  // Returns an array of TreeNode objects for node 1 and node 3. Node 2 is not
  // returned since it is not a leaf.
  var leaves = tree.leaves();
 
  // Find data in a tree
  var node = tree.addChild(someObject);
  var match = tree.find(someObject);  // match === node
 
  // Find the tree root, from any node
  var root = node.root();
  
  // Execute a function on each node in the tree
  node.forEach(function(element) {
    element.data.status='processed';
  });

Tests

npm test

Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code.

Release History

• 0.2.3 Make forEach() properly recursive
• 0.2.2 Don't assume existence of children array. Added numChildren() helper
• 0.2.1 Remove sourcemaps from non-minified prod file
• 0.2.0 Add forEach() to execute a function on each node in a tree
• 0.1.4 Better module export syntax
• 0.1.3 Updated packaging for Bower
• 0.1.2 Updated packaging
• 0.1.1 Updated packaging
• 0.1.0 Initial release