carlesba

import EventEmitter from "events";
import { useCallback, useEffect, useRef } from "react";

export default function useListener(listener = () => {}) {
  const emitter = useRef(new EventEmitter());

  useEffect(() => {
    const currentEmitter = emitter.current;
    currentEmitter.on("event", listener);
    return () => {

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const passBy = by => pass => {
  by(pass)
  return pass
}

/*
  Example:
///////////////////
  const log = console.log
  const get = (attribute, target) => target[attribute]

carlesba

import {
  curryN,
  update,
  nth
} from 'ramda'

// Getting an array, modify just one its elements allowing different pipes in a data structure
// Number -> Function -> Array -> Array
const path = curryN(
  3,

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const createReducer = (initialState, actionMap) => (state = initialState, action) => {
  const {signals} = action
  if (signals) {
    const signal = signals.find(
      (stepAction) => actionMap[stepAction.type]
    )
    if (signal) {
      const reducer = actionMap[signal.type]
      return reducer(state, signal)
    } else {

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/*
  Returns a valuable function:
  x = add(2)(4) // x === 6
  y = x(1)(2) // x === 6 && y === 9
  z = y(10) // z === 19
*/

function add (n) {	
	var fn = function (m) {
		return add(n+m);

carlesba

import expect from 'expect' // using expect by @mjackson

export default (state) => {
  const spy = expect.createSpy()
  const getState = () => state
  const dispatch = (action) => typeof action === 'function'
    ? action(dispatch, getState)
    : spy(action)
  return {spy, getState, dispatch}
}

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/*
  Block
  --
  Propagate any prop to the children but allowing className extension
  
  Needs `babel-plugin-transform-object-rest-spread`
*/
const Block = ({classes, className, ...rest}) =>
  <div {...rest} className={`${[classes, className].join(' ')}`} />
  

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const compose = (...fns) => (...args) => fns.reverse().reduce((acc, fn, index) => {
  if (index) return fn(acc)
  else return fn.apply(this, acc)
}, args)

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function ImmutableArray (arr) {
  arr.forEach((key, index) => {
    Object.defineProperty(this, index, {
      enumberable: true,
      get: () => key,
      set: () => {
        throw new Error('cannot be mutated')
      }
    })
  })

carlesba

/*
  <div class="o-beside**">
    <div class="o-beside__wrapper">
      <div>content</div>
    </div>
  </div>
 */
.o-beside
  position: absolute
  height: 0