liamloads-reverse-endianness

About

Description

This is a fast algorithm for reversing byte order endianness of hexadecimal numbers without regular expressions.

It's written in JavaScript and outputs a case-insensitive, even-number hexadecimal string in reverse byte order.

A complete line-by-line algorithm code explanation is coming soon.

License

The Unlicense

Installation

Browser

git clone https://github.com/liamloads/javascript-reverse-endianness.git

<script src="liamloads-reverse-endianness.js" type="text/javascript"></script>

Node.js

npm install liamloads-reverse-endianness

const liamloadsReverseEndianness = require('liamloads-reverse-endianness');

Usage

Details

The return value is a string of the argument in reverse byte order.

If the argument isn't a hexadecimal number or if the UTF-16 code unit length exceeds 999999999, the return value is false.

Examples

console.log(liamloadsReverseEndianness('123456789'));
// '8967452301'

console.log(liamloadsReverseEndianness('0123456789'));
// '8967452301'

console.log(liamloadsReverseEndianness('abcdef'));
// 'efcdab'

console.log(liamloadsReverseEndianness('ABCDEF'));
// 'EFCDAB'

console.log(liamloadsReverseEndianness('abcdef '));
// false

console.log(liamloadsReverseEndianness('abcdefg'));
// false