# @markup rdoc

API Changes in RubyTree¶ ↑

This file documents various API level changes that have been made to the RubyTree package.

Note: API level changes are expected to reduce dramatically after the 1.x release. In most cases, an alternative will be provided to ensure relatively smooth transition to the new APIs.

Release 0.9.5 Changes¶ ↑

• The {Tree::TreeNode#add} method now provides 'move' semantics, if a child which is on an existing tree is added to another tree, or location on the same tree. In this situation, the child node is removed from its old position, and added to the new parent node. After the add operation is complete, the child no longer exists on the old tree/location.

Release 0.9.3 Changes¶ ↑

• The validation for unique node names has changed in the {Tree::TreeNode#add} method. RubyTree no longer enforces globally unique names. The node-names need to be unique only between the sibling nodes.

Release 0.9.0 Changes¶ ↑

• New post-ordered traversal via the {Tree::TreeNode#postordered_each} method.

• The Binary Tree implementation now supports in-order traversal via the {Tree::BinaryTreeNode#inordered_each} method.

• RubyTree now mixes in the {ruby-doc.org/core-1.8.7/Comparable.html Comparable} module.

• The traversal methods ({Tree::TreeNode#each}, {Tree::TreeNode#preordered_each}, {Tree::TreeNode#postordered_each} and {Tree::TreeNode#breadth_each}) now correctly return an {ruby-doc.org/core-1.8.7/Enumerable.html Enumerator} as the return value when no block is given, and return the receiver node if a block was provided. This is consistent with how the standard Ruby collections work.

Release 0.8.3 Changes¶ ↑

• {Tree::TreeNode#siblings} will now return an empty array for the root node.

Release 0.8.0 Changes¶ ↑

• Added the ability to specify an optional insertion position in the {Tree::TreeNode#add} method. Idea and original code contributed by Dirk.

• Added a new method {Tree::TreeNode#detached_subtree_copy} to allow cloning the entire tree. This method is also aliased to {Tree::TreeNode#dup}. Idea and original code contributed by Vincenzo Farruggia.

• Converted all CamelCase method names to the canonical ruby_method_names (underscore separated). The CamelCase methods can still be invoked, but will throw a Deprecated warning.

Release 0.7.0 Changes¶ ↑

• Converted all exceptions thrown on invalid method arguments to from 'RuntimeError' to 'ArgumentError'. This impacts the following methods:

  • {Tree::TreeNode#initialize}

  • {Tree::TreeNode#add}

  • {Tree::TreeNode#[]}

  • {Tree::BinaryTreeNode#add}

• Added {Tree::Utils::TreeMetricsHandler#level Tree::Utils::TreeMetricsHandler#level} as an alias for {Tree::Utils::TreeMetricsHandler#node_depth Tree::Utils::TreeMetricsHandler#node_depth}

• Added new methods {Tree::Utils::TreeMetricsHandler#in_degree Tree::Utils::TreeMetricsHandler#in_degree} and {Tree::Utils::TreeMetricsHandler#out_degree Tree::Utils::TreeMetricsHandler#out_degree} to report the node's degree stats

• {Tree::TreeNode#is_only_child?} now returns true for a root node.

• {Tree::TreeNode#next_sibling} and {Tree::TreeNode#previous_sibling} now return nil for a root node.

• {Tree::TreeNode#add} and {Tree::TreeNode#<<} now throw an ArgumentError exception if a nil node is passed as an argument.

• Added new methods {Tree::Utils::JSONConverter#to_json Tree::Utils::JSONConverter#to_json} and {Tree::Utils::JSONConverter::ClassMethods#json_create Tree::TreeNode#json_create} to convert to/from the JSON format. Thanks to Dirk for this change.

Release 0.6.1 Changes¶ ↑

• Deprecated the {Tree::Utils::TreeMetricsHandler#depth} method as it was returning an incorrect depth value. Have introduced a new replacement method {Tree::Utils::TreeMetricsHandler#node_depth} which returns the correct result.

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