This is an npm module that implements the SuperFastHash algorithm by Paul Hsieh in JavaScript (ECMAScript 2015) and WebAssembly.

The WebAssembly implementation is based on AssemblyScript.

Installation

You can add the module to your project using the following command:

npm install mjethani/superfasthash --save

Usage

Here's a simple example:

let { hash } = require('superfasthash');

// The hash function expects a byte array.
let hashText = text => hash(new Uint8ClampedArray([...Buffer.from(text)]));

console.log(hashText('Hello, world!')); // Prints "1609733543"

The above example uses the default JavaScript implementation. If you want to use the WebAssembly version, you can do it like so:

let superfasthash = require('superfasthash/wasm');

let { hash } = superfasthash;
let hashText = text => hash(new Uint8ClampedArray([...Buffer.from(text)]));

superfasthash.initialize().then(() => {
  let digest = hashText('The quick brown fox jumps over the lazy dog.');
  console.log(digest); // Prints "-1533272743"
});

Development

To get started, you can run the following sequence of commands:

git clone https://github.com/mjethani/superfasthash.git
cd superfasthash
npm install
npm test

The source files are in the src directory. If you make a change to the WebAssembly implementation, you will have to run npm run build to rebuild the distribution in the dist directory. You might want to run the unit tests in the tests directory by running npm test.

Performance

The file benchmarks/benchmark.js contains a little performance benchmark. You can try it out by running npm run benchmark.

License

Please see the LICENSE file.

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Copyright 2019 Manish Jethani