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List comprehensions

To see a working version of the code check out https://codesandbox.io/s/j497w26383 and open the console.

This file demonstrates a very basic List as an applicative functor for the purpose of demonstrating a simple list comprehension.

	import is from './is-util';

	/**
	* Either Monad class (from Functional Programming in JavaScript)
	*/
	class Either {
	constructor(value) {
	this._value = value;
	}
	get value () {

	<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
	http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
	version="3.1">
	</web-app>

	data Parser = WebParser \| DbParser

	class ParseStrategy p where
	parse :: p -> String -> String

	instance ParseStrategy Parser where
	parse WebParser s = "code for parsing web stuff goes here"
	parse DbParser s = "code for parsing db stuff goes here"

	fromDB = parse DbParser

	import { Observable } from 'rxjs';

	// Adapted from https://github.com/Reactive-Extensions/rx-node/blob/87589c07be626c32c842bdafa782fca5924e749c/index.js#L52
	export default function fromStream(stream, finishEventName = 'end', dataEventName = 'data') {
	stream.pause();

	return new Observable((observer) => {
	function dataHandler(data) {
	observer.next(data);
	}

	/**
	* Minimal demo of parser combinators, possibly as a target for recent
	* JS web dev graduates to implement as an exercise.
	*
	* Huge credit to Hutton, Meijer, and Swierstra for their papers
	* on the subject.
	*/

	class Parser {

	// Simple example, but the idea holds for more complex objects.


	/* 1) Start with OO */

	// user.js
	class User {
	constructor(firstName, lastName, email) {
	this.firstName = firstName
	this.lastName = lastName