View FlowTutorial.js
// @flow
// Flow Fundamentals For JavaScript Developers
Tutorial for JavaScript Developers wanting to get started with FlowType.
Thorough walkthrough of all the basic features.
We will go through the basic features to gain a better understanding of the fundamentals.
You can uncomment the features one by one and work through this tutorial.

Making Toys with F# - A Small Elm-like DSL in F#

A Small Elm-Like DSL in F#

I've been working on a talk about the virtues of building toy examples for the purpose of communicating ideas with simple interactive examples.

The toys I talk about in my presentation are based my interest in tools that allow programmers to quickly build web applications that allow them to explore their architecture. So to kickstart this series off, I want to introduce a simple

View Json.purs
module Main where
-- | JSON is an incredibly simple format. Even its lists are untyped.
-- | As with all languages, functional programming encourages us to
-- | make a domain-specific language (or DSL) to capture the "ideas"
-- | of the language, which we can then use to talk about its content.
-- | In this little snippet, we'll build a JSON DSL, transform it into
-- | a recursive structure, and then use that result to generate some
View TransformingDeeplyNestedData.js
import {
} from 'ramda'
const isObject = input => input !== null && typeof input === 'object'
View fl-interfaces.js
import { class, interface, implements } from 'sweet-interfaces';
const constant = x => _ => x;
const identity = x => x;
const flip = f => (a, b) -> f(b, c);
interface Setoid {
// eq :: Setoid a => a ~> a -> Boolean
eq(b) { return this === b; }
View interactive-config.js
// Sometimes, you might want to supply *some* config, but
// not necessarily *all*. Maybe your password is really
// secret, so you don't want to risk saving it in a config
// file. In which case, you'll want to ask the user to enter
// it when your script runs.
// This interface provides a flexible approach, where
// the user is prompted for a missing key when it's
// requested - if a particular key isn't needed for a given
// run, the user won't need to enter it. Of course, if the
View ramdaprogram.js
var byMonth = R.groupBy(R.prop('Month'));
var byAuthor = R.groupBy(R.prop('Author'));
var royalty_key = 'Royalty (SUM)';
var months_keys = R.uniq('Month'), data)).sort();
var monthly_revenue = =>
R.reduce((acc, record) => acc + parseMoney(record[royalty_key]), 0, group),
View ct_notes.txt
Category Theory 1.1: Motivation and Philosophy
Composability, Abstraction, Reusability
Category Theory is a higher-level language.
Not a practical, executable language.
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View qs.js
const reg = new RegExp("([^?=&]+)(=([^&]*))?", "g")
function qs (uri) {
const obj = {}
uri = uri.replace(/^.*\?/, '')
uri.replace(reg, map)
return obj
function map (a0, a1, a2, a3) {
obj[decodeURIComponent(a1)] = decodeURIComponent(a3)