ganapativs

import React, { useState } from "react";
import { Machine, assign } from "xstate";
import { useMachine } from "@xstate/react";

const signupUser = email =>
  new Promise((resolve, reject) => {
    setTimeout(() => {
      // resolve("You are signed up!");
      reject("Unable to sign you up :(");
    }, 1000);

fatcerberus

Monads for the Rest of Us

by Bruce Pascoe - 1 May, 2019

"A monad is just a monoid in the category of endofunctors. What's the problem?" ~James Iry[^1]

The problem... is that there are several problems.

It's been said that monads bear a dreadful curse. Once you finally understand what they are, you begin to see them everywhere--but somehow become completely incapable of explaining them to anyone else. Many tutorial writers have tried to break the Great Curse--the Web is lousy with bold attempts and half successes that attest to this--and just as many have failed. Well, I'm here to address the elephant in the room[^2] and tell you that I intend to break the Great Curse once and for all.

There are basically two ways a monad tutorial tends to go. One is a paragraph or two of minimal descriptions of one or two common monads (Haskell's Maybe in particular is very popular), followed by a lot of intimidating Haskell syntax trying to explain--precisely--how it all fits together. This is well

JuneKelly

A blood black nothingness began to spin.

Began to spin.

Let's move on to system.

System.

Feel that in your body.

Azgaar

license: gpl-3.0
height: 570
border: no

DaveKin

/**
 * Converts a SASS map of css property names and values into CSS output.
 * Properties named `description` will have their value inserted as comments.
 * 
 * Nested maps will be processed recursively.
 * 
 * @param  {map} $map the map of properties to output
 */
@mixin map-to-props($map){
	@if type-of($map) == map {

cuibonobo

Here's an example application that uses the pattern detailed below: https://github.com/tantastik/talent-curator

---

This document is an attempt to describe the first step of a large project structure with flask and some basic modules:

• SQLAlchemy
• WTForms

Please feel free to fix and add your own tips.

dergachev

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

isochronous

define([
    "underscore",
    "backbone",
    "marionette",
    "vent"
],

/**
 * Creates the primary `Marionette.Application` object that runs the admin framework.  Provides a central point
 * from which all other sub-applications are started, shown, hidden, and stopped.

mbostock

license: gpl-3.0
height: 960
border: no
redirect: https://observablehq.com/@d3/bubble-chart