binary-heap.js

Binary heap

A package for general purpose binary heap data structure that can contain any type of data

Installation

npm i binary-heap.js

Constructor

Parameter	Type	Required	Default	Description
extractor	function	false		function that extracts the key used for sorting elements in the heap (should be equal to identity for primitive data types)

Methods

Name	Description	Return
Insert	Insert a single element into the heap	void
InsertMany	Inserts Many elements into the heap	void
pop	Pops the top element (maximum or minimum depending on the type of the heap)	type T (type of elements inserted)
isEmpty	Checks if the heap is empty or not	boolean

Usage

const maxHeap = new MaxHeap( (x) =>x );
maxHeap.insert(3);
maxHeap.insertMany([5,7].values())

maxHeap.pop() // 7
maxHeap.pop() // 5
maxHeap.pop() // 3
maxHeap.pop() // undefined

const minHeap = new MinHeap( (x) =>x );

maxHeap.insert(5);
maxHeap.insertMany([3,7].values())

maxHeap.pop() // 3
maxHeap.pop() // 5
maxHeap.pop() // 7
maxHeap.pop() // undefined

Works with any data structure that implements the iteratable interface to provide it's elements

// Works with arrays, maps, sets
const arr = [1,2,3];
const set = new Set([1,2,3])
const map = new Map();
map.set(1,1)
map.set(2,2)
map.set(3,3);

const maxHeapOne = new MaxHeap((x) =>x);
maxHeapOne.insertMany(arr.values());

const maxHeapTwo = new MaxHeap((x) =>x);
maxHeapTwo.insertMany(set.values());

const maxHeapThree = new MaxHeap((x) =>x);
maxHeapThree.insertMany(map.keys().values());

Works with complex objects as long as you provide the right extractor

const arr = [{id:1},{id:2},{id:3}];

const maxHeap = new MaxHeap((x) =>x.id);
maxHeap.insertMany(arr.values());