Bill Vatikiotis vvatikiotis

Algebraic Effects in JavaScript part 2 - Capturing continuations with Generators

This is the second part of a series about Algebraic Effects and Handlers.

Part 1 : continuations and control transfer
Part 2 : Capturing continuations with Generators
Part 3 : Delimited continuations
Part 4 : Algebraic Effects and handlers

Note: initially I planned a 3-part series, but since the current post on undelimited continuations ended up taking

Algebraic Effects in JavaScript part 1 - continuations and control transfer

This is the first post of a series about Algebraic Effects and Handlers.

There are 2 ways to approach this topic:

Denotational: explain Algebraic Effects in terms of their meaning in mathematics/Category theory
Operational: explain the mechanic of Algebraic Effects by showing how they operate under a chosen runtime environment

Both approaches are valuables and give different insights on the topic. However, not everyone (including me), has the prerequisites to grasp the concepts of Category theory and Abstract Algebra. On the other hand, the operational approach is accessible to a much wider audience of programmers even if it doesn't provide the full picture.

3 Gripes With React

I started using React 3.5 years ago, and I still love it. It was such a well-designed solution that not much has changed since then, only superficial stuff like naming. What I learned then is still wholly applicable today because it's such a good idea (although now you can choose from many other libraries). On top of that, we now benefit from an entirely new architecture (fiber) without changing much.

state-machine-component

A tiny (265 byte) utility to create state machine components using two pure functions.

🔥 JSFiddle Demo

Usage

The API is a single function that accepts 2 pure functions as arguments:

JavaScript error logging services

To allow easier contributions, I've moved this to https://github.com/cheeaun/javascript-error-logging. Thanks! 😄

http://errorception.com/ - translate error messages to English
http://www.exceptionhub.com/
http://jserrlog.appspot.com/
http://www.muscula.com/ - source maps, translate error messages to English
https://www.airbrake.io/ - tracekit, source maps

	# Reconstructed via infocmp from file: /usr/share/terminfo/t/tmux-256color
	tmux-256color\|tmux with 256 colors,
	OTbs, OTpt, am, hs, km, mir, msgr, xenl, AX, G0,
	colors#256, cols#80, it#8, lines#24, pairs#32767, U8#1,
	acsc=++\,\,--..00``aaffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{\|\|}}~~,
	bel=^G, blink=\E[5m, bold=\E[1m, cbt=\E[Z, civis=\E[?25l,
	clear=\E[H\E[J, cnorm=\E[34h\E[?25h, cr=^M,
	csr=\E[%i%p1%d;%p2%dr, cub=\E[%p1%dD, cub1=^H,
	cud=\E[%p1%dB, cud1=^J, cuf=\E[%p1%dC, cuf1=\E[C,
	cup=\E[%i%p1%d;%p2%dH, cuu=\E[%p1%dA, cuu1=\EM,

	import createAction from 'redux-actions/lib/createAction'

	import { create, read, update, destroy, params } from 'utils/xhr'

	import always from 'ramda/src/always'
	import assoc from 'ramda/src/assoc'
	import compose from 'ramda/src/compose'
	import concat from 'ramda/src/concat'
	import dissoc from 'ramda/src/dissoc'
	import flip from 'ramda/src/flip'

	function getType (value) {
	let type = typeof value;
	if (type === 'object') {
	return value ? Object.prototype.toString.call(value).slice(8, -1) : 'null';
	}
	return type;
	}

	[NaN, 0, 1, Infinity, // numbers
	null, undefined, false, 'str', // other primitives

	<html>
	<body>
	<script type="text/javascript" src="//mozilla.github.io/pdf.js/build/pdf.js"></script>
	<script type="text/javascript">
	var url = "https://docs.google.com/document/export?format=pdf&id=1ML11ZyyMpnAr6clIAwWrXD53pQgNR-DppMYwt9XvE6s&token=AC4w5Vg7fSWH1Hq0SgNckx4YCvnGPaScyw%3A1423618416864";

	var pages = [], heights = [], width = 0, height = 0, currentPage = 1;
	var scale = 1.5;

	function draw() {

	package org.example
	package auth

	import org.scalatra.auth.ScentryStrategy
	import org.scalatra.{CookieSupport, ScalatraBase}

	trait RedisClient {
	def get(key: String): Option[String]
	}