Heapsort

Yet another implementation of heapsort in JavaScript aimed to be flexible, lightweight and fast.

• Install
• Usage
• Performance
• More examples
• Contributing
• Support

Install

npm install @alvarocastro/heapsort

Usage

const sort = require('@alvarocastro/heapsort');

const elements = [8, -1, 3, 0.5, 200];
sort(elements);
// => [-1, 0.5, 3, 8, 200]

sort(elements[, compare])

Returns a new sorted array based on the compare function criteria.

elements

Type: Array

List of elements to sort.

compare

Type: Function Default: comparatorAscending

The function to use to compare two elements and find their sorting order. The expected return of the function is:

• -1 to sort the element to the left.
• 1 to sort the element to the right.
• 0 when the elements are the same, no sorting is made.

A descending function is also provided in utils.js.

Performance

Want to test the performance?

Included is the command npm run performance that will run a battery of profiled tests for your needs.

Here is an example of the output (YMMV depending your hardware)

Sorting random numbers generated in the range [-1,1]:
#1 - 10 numbers
> Heapsort: 0ms
> Array.sort: 1ms
#2 - 100 numbers
> Heapsort: 2ms
> Array.sort: 1ms
#3 - 1000 numbers
> Heapsort: 8ms
> Array.sort: 1ms
#4 - 10000 numbers
> Heapsort: 16ms
> Array.sort: 23ms
#5 - 100000 numbers
> Heapsort: 45ms
> Array.sort: 394ms
#6 - 1000000 numbers
> Heapsort: 709ms
> Array.sort: 6260ms

More examples

Reverse order

const sort = require('@alvarocastro/heapsort');
const {comparatorDescending} = require('@alvarocastro/heapsort/utils');

const elements = [8, -1, 3, 0.5, 200];
sort(elements, comparatorDescending);
// => [200, 8, 3, 0.5, -1]

Custom elements

const sort = require('@alvarocastro/heapsort');

const elements = [
	{name: 'Sarah Connor', firstAppearance: 'The Terminator'},
	{name: 'T-800', firstAppearance: 'The Terminator'},
	{name: 'Kyle Reese', firstAppearance: 'The Terminator'},
	{name: 'John Connor', firstAppearance: 'Terminator 2: Judgement Day'},
	{name: 'T-1000', firstAppearance: 'Terminator 2: Judgement Day'}
];
const comparator = function (a, b) {
	if (a.name < b.name) {
		return -1;
	} else if (a.name > b.name) {
		return 1;
	}
	return 0;
};
sort(elements, comparator);
// => [
// {name: 'John Connor', firstAppearance: 'Terminator 2: Judgement Day'},
// {name: 'Kyle Reese', firstAppearance: 'The Terminator'},
// {name: 'Sarah Connor', firstAppearance: 'The Terminator'},
// {name: 'T-800', firstAppearance: 'The Terminator'},
// {name: 'T-1000', firstAppearance: 'Terminator 2: Judgement Day'}
// ]

Contributing

Contributions are always welcome! Please run npm test beforehand to ensure everything is ok.

Support

If you use this package please consider starring it :)