Heap

A binary heap implementation in JavaScript ES6.
It supports the basic heap operations and the creation of a heap from an existing array.
This heap implementation uses a 0-based indexing.

Installation

$ npm install @gaetancovelli/heap

Usage

var Heap = require('@gaetancovelli/heap');

Creation

Creates an empty min heap

var heap = new Heap();

Creates an empty max heap

var heap = new Heap(Heap.MAX_PROPERTY);

Creates a min heap from an existing array that will get heapified

var array = [5, 4, 3, 2, 1];
var heap = new Heap(Heap.MIN_PROPERTY, array);

Creates a max heap from an existing array that will get heapified

var array = [1, 2, 3, 4, 5];
var heap = new Heap(Heap.MAX_PROPERTY, array);

Operations

Push - Pushes a number to the heap.
It can be a number or an array whose first element is the priority value and second element is the record we want to track. It has to be consistent for every elements of the heap.

heap.push(1); // A value OR
heap.push([1, 'My task with priority value 1']); // A record with a string OR
heap.push([1, {firstname: 'Gaetan', lastname: 'Covelli'}]); // A record with an object

Peek - Returns the top element of the heap

heap.peek();

Pop - Pops and return the top element of the heap

heap.pop()

Tests

Tests are performed with mocha.
To run the tests:
$ npm test

Build

The ES6 code is transpiled with Babel to dist/Heap.js
To run babel and build the dist:
$ gulp babel

You can transpile automatically everytime the source file is saved by:
$ gulp dev

License

Copyright (c) 2017 Gaëtan Covelli.
Released under the MIT License