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/* ------------------------------------------------------------------------- *
        Async / Await simple implementation with generators and promises
* -------------------------------------------------------------------------- */

const wrap = generator => (...args) => {
  const iterator = generator(...args)
  const loop = ({ value: promise, done }) => {
    if (!done) {
      promise.then(
        x => loop(iterator.next(x)),

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Promises, under the hood

You all know that to create a new Promise you need to define it this way:

  new Promise((resolve, reject) => {
    ...
    resolve(someValue)
  })

You are passing a callback that defines the specific behavior of your promise.

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import { compose, add, map, range } from 'lodash/fp'
import { Just, Nothing } from './Maybe'

class Task {
  constructor(fork) {
    this.fork = fork
  }

  static of(x) {
    return Task.resolve(x)

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import React, { Component } from 'react'
import isEqual from 'lodash/fp/isEqual'

// let you inject local state to you component

const stateful = (mapPropsToInitialState = () => ({})) => Child => {
  return class StateFul extends Component {

    static displayName = `StateFul(${Child.displayName || Child.name})`

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/* ----------------------------------------- *
        Sum
* ----------------------------------------- */

const Sum = x => ({
  x,
  concat: ({ x: y }) => Sum(x + y),
  inspect: () => `Sum(${x})`,
})

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const Task = require('data.task')
const Either = require('data.either')
const { Left, Right } = Either
const request = require('request')
const { List } = require('immutable-ext')
const { drop, prop, map } = require('lodash/fp')

const effect = f => x => {
  f(x)
  return x

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/* --------------------------------------------------------------- *
    Remove node modules recursively in a pure functionnal way
* ---------------------------------------------------------------- */

// applying functionnal techniques from @drboolean in his egghead course
// https://egghead.io/courses/professor-frisby-introduces-composable-functional-javascript


const fs = require('fs.extra')
const path = require('path')

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/* ----------------------------------------- *
        Lazy List Implementation
* ----------------------------------------- */

// Haskell-like infinite List, implemented with es6 generators

// Lazyness lets you do crazy stuff like
List.range(0, Infinity)
  .drop(1000)
  .map(n => -n)

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// crack the ceasar code by minimazing the distance between english language letter 
// occurrence and all the letter occurrence of all the possible shifts of a message. 

const englishLetterOccurrence = [ 8.2, 1.5, 2.8, 4.3, 12.7, 2.2, 2.0, 6.1, 7.0, 0.2, 0.8, 4.0, 2.4, 6.7, 7.5, 1.9, 0.1, 6.0, 6.3, 9.1, 2.8, 1.0, 2.4, 0.2, 2.0, 0.1 ]

const letters = 'abcdefghijklmnopqrstuvwxyz'.split('')

const letterOccurrence = str =>
  letters
    .map(c => (str.match(new RegExp(c, 'gi')) || []).length)

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const State = state => new Proxy({
  state,
  listeners: [],
  subscribe(listener) {
    this.listeners.push(listener)
    return () => this.listeners.filter(x => x !== listener)
  },
  set(stateUpdates) {
    this.state = Object.assign({}, this.state, stateUpdates);
    this.listeners.forEach(f => {