npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

mu-ffsm

v0.0.2

Published

Fluent functional state machines

Downloads

2

Readme

µ-ffsm: Micro fluent API helper

Very tiny helper function to construct fluent interfaces.

> npm i mu-ffsm

Import

var FFSM = require('mu-ffsm');

Create language/machine.

// internal state is an Array
var Talker = FFSM({
	0:    function() { return []; }, // TODO allow const
	talk: function(say, what) { say.push(what); return say; },
	1:    function(say, sep) { return say.join(sep || ' '); }
});

Construct sentences/instances:

var cowboyGreeting = Talker()
	.talk('howdy')
	.talk('cowboy');

// make dramatic
console.log(cowboyGreeting(', ...'));

Idea

We consider a sort of 'state machine' that maintains an internal state of type S. We then consider three types of functions on it:

  • entry : * ⟶ S
  • transition : S ⟶ * ⟶ S
  • exit : S ⟶ * ⟶ *

We write the entry function as 0, the exit function as 1 and then name all the transition functions however we like.

Then

	var M = FFSM({
		0: function(i)    { return /* initial state */; } // entry function
		a: function(s, t) { return /* new state     */; } // transition 'a'
		b: function(s, t) { return /* new state     */; } // transition 'b'
		1: function(s, x) { return /* final value   */; } // exit function
	});

Now

	var i = M(entry)	// x : S <- 0(entry)
		.a(trigger_0)	// y : S <- a(x, trigger_0)
		.b(trigger_1)	// z : S <- b(y, trigger_1)
		.a(trigger_2);  // i : S <- a(z, trigger_2)

Finally

	var y = i(x);		// y <- 1(i, x)

So we have

  • First M(entry) creates a new machine instance of type M. It's initial state derived from entry (0(entry)).

  • Then .a(trigger_0) transitions the machine with transition a to a new state, using the previous state and the data from trigger_0 to compute the new state.

  • Similarly .b(t_1), .a(t_2).

  • Finally, the i(x) call constructs an element out of the internal state and the argument using the exit function 1(i,x).