Package Exports

avl-tree-typed
avl-tree-typed/dist/index.js

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Readme

NPM GitHub top language npm eslint npm bundle size npm

What

Brief

This is a standalone AVL Tree data structure from the data-structure-typed collection. If you wish to access more data structures or advanced features, you can transition to directly installing the complete data-structure-typed package

How

install

npm

npm i avl-tree-typed --save

yarn

yarn add avl-tree-typed

methods

snippet

TS

import {AVLTree, AVLTreeNode} from 'data-structure-typed';
// /* or if you prefer */ import {AVLTree} from 'avl-tree-typed';

const avlTree = new AVLTree<AVLTreeNode<number>>();

const idsOrVals = [11, 3, 15, 1, 8, 13, 16, 2, 6, 9, 12, 14, 4, 7, 10, 5];
avlTree.addMany(idsOrVals, idsOrVals);

const node6 = avlTree.get(6);
node6 && avlTree.getHeight(node6)           // 3
node6 && avlTree.getDepth(node6)            // 1
const getNodeById = avlTree.get(10, 'id');
getNodeById?.id                             // 10

const getMinNodeByRoot = avlTree.getLeftMost();
getMinNodeByRoot?.id                        // 1

const node15 = avlTree.get(15);
const getMinNodeBySpecificNode = node15 && avlTree.getLeftMost(node15);
getMinNodeBySpecificNode?.id                // 12

const subTreeSum = node15 && avlTree.subTreeSum(node15);
subTreeSum                                  // 70

const lesserSum = avlTree.lesserSum(10);
lesserSum                                   // 45

const node11 = avlTree.get(11);
node11?.id                                  // 11

const dfs = avlTree.DFS('in', 'node');
dfs[0].id                                   // 1 
avlTree.perfectlyBalance();
const bfs = avlTree.BFS('node');
avlTree.isPerfectlyBalanced() && bfs[0].id  // 8 

avlTree.remove(11, true)[0].deleted?.id     // 11
avlTree.isAVLBalanced();                    // true
node15 && avlTree.getHeight(node15)         // 2
avlTree.remove(1, true)[0].deleted?.id      // 1
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 4

avlTree.remove(4, true)[0].deleted?.id      // 4
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 4

avlTree.remove(10, true)[0].deleted?.id     // 10
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 3

avlTree.remove(15, true)[0].deleted?.id     // 15
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 3

avlTree.remove(5, true)[0].deleted?.id      // 5
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 3

avlTree.remove(13, true)[0].deleted?.id     // 13
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 3

avlTree.remove(3, true)[0].deleted?.id      // 3
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 3

avlTree.remove(8, true)[0].deleted?.id      // 8
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 3

avlTree.remove(6, true)[0].deleted?.id      // 6
avlTree.remove(6, true).length              // 0
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 2

avlTree.remove(7, true)[0].deleted?.id      // 7
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 2

avlTree.remove(9, true)[0].deleted?.id      // 9
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 2

avlTree.remove(14, true)[0].deleted?.id     // 14
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 1

avlTree.isAVLBalanced();                    // true
const lastBFSIds = avlTree.BFS();
lastBFSIds[0]                               // 12 

const lastBFSNodes = avlTree.BFS('node');
lastBFSNodes[0].id                          // 12

JS

const {AVLTree} = require('data-structure-typed');
// /* or if you prefer */ const {AVLTree} = require('avl-tree-typed');

const avlTree = new AVLTree();

const idsOrVals = [11, 3, 15, 1, 8, 13, 16, 2, 6, 9, 12, 14, 4, 7, 10, 5];
avlTree.addMany(idsOrVals, idsOrVals);

const node6 = avlTree.get(6);
node6 && avlTree.getHeight(node6)           // 3
node6 && avlTree.getDepth(node6)            // 1
const getNodeById = avlTree.get(10, 'id');
getNodeById?.id                             // 10

const getMinNodeByRoot = avlTree.getLeftMost();
getMinNodeByRoot?.id                        // 1

const node15 = avlTree.get(15);
const getMinNodeBySpecificNode = node15 && avlTree.getLeftMost(node15);
getMinNodeBySpecificNode?.id                // 12

const subTreeSum = node15 && avlTree.subTreeSum(node15);
subTreeSum                                  // 70

const lesserSum = avlTree.lesserSum(10);
lesserSum                                   // 45

const node11 = avlTree.get(11);
node11?.id                                  // 11

const dfs = avlTree.DFS('in', 'node');
dfs[0].id                                   // 1 
avlTree.perfectlyBalance();
const bfs = avlTree.BFS('node');
avlTree.isPerfectlyBalanced() && bfs[0].id  // 8 

avlTree.remove(11, true)[0].deleted?.id     // 11
avlTree.isAVLBalanced();                    // true
node15 && avlTree.getHeight(node15)         // 2
avlTree.remove(1, true)[0].deleted?.id      // 1
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 4

avlTree.remove(4, true)[0].deleted?.id      // 4
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 4

avlTree.remove(10, true)[0].deleted?.id     // 10
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 3

avlTree.remove(15, true)[0].deleted?.id     // 15
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 3

avlTree.remove(5, true)[0].deleted?.id      // 5
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 3

avlTree.remove(13, true)[0].deleted?.id     // 13
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 3

avlTree.remove(3, true)[0].deleted?.id      // 3
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 3

avlTree.remove(8, true)[0].deleted?.id      // 8
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 3

avlTree.remove(6, true)[0].deleted?.id      // 6
avlTree.remove(6, true).length              // 0
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 2

avlTree.remove(7, true)[0].deleted?.id      // 7
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 2

avlTree.remove(9, true)[0].deleted?.id      // 9
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 2

avlTree.remove(14, true)[0].deleted?.id     // 14
avlTree.isAVLBalanced();                    // true
avlTree.getHeight()                         // 1

avlTree.isAVLBalanced();                    // true
const lastBFSIds = avlTree.BFS();
lastBFSIds[0]                               // 12 

const lastBFSNodes = avlTree.BFS('node');
lastBFSNodes[0].id                          // 12

API docs & Examples

API Docs

Live Examples

Examples Repository

Data Structures

Data Structure	Unit Test	Performance Test	API Docs
AVL Tree			AVLTree

Standard library data structure comparison

Data Structure Typed	C++ STL	java.util	Python collections
AVLTree<K, V>	-	-	-

Benchmark

avl-tree

test name	time taken (ms)	executions per sec	sample deviation
10,000 add randomly	31.32	31.93	3.67e-4
10,000 add & delete randomly	70.90	14.10	0.00
10,000 addMany	40.58	24.64	4.87e-4
10,000 get	27.31	36.62	2.00e-4

Built-in classic algorithms

Algorithm	Function Description	Iteration Type
Binary Tree DFS	Traverse a binary tree in a depth-first manner, starting from the root node, first visiting the left subtree, and then the right subtree, using recursion.	Recursion + Iteration
Binary Tree BFS	Traverse a binary tree in a breadth-first manner, starting from the root node, visiting nodes level by level from left to right.	Iteration
Binary Tree Morris	Morris traversal is an in-order traversal algorithm for binary trees with O(1) space complexity. It allows tree traversal without additional stack or recursion.	Iteration

Software Engineering Design Standards

Principle	Description
Practicality	Follows ES6 and ESNext standards, offering unified and considerate optional parameters, and simplifies method names.
Extensibility	Adheres to OOP (Object-Oriented Programming) principles, allowing inheritance for all data structures.
Modularization	Includes data structure modularization and independent NPM packages.
Efficiency	All methods provide time and space complexity, comparable to native JS performance.
Maintainability	Follows open-source community development standards, complete documentation, continuous integration, and adheres to TDD (Test-Driven Development) patterns.
Testability	Automated and customized unit testing, performance testing, and integration testing.
Portability	Plans for porting to Java, Python, and C++, currently achieved to 80%.
Reusability	Fully decoupled, minimized side effects, and adheres to OOP.
Security	Carefully designed security for member variables and methods. Read-write separation. Data structure software does not need to consider other security aspects.
Scalability	Data structure software does not involve load issues.