joelbarbosa

function createStack() {
  const array = [];
  return {
    push(item) {
      array.push(item);
    },
    pop() {
      return array.pop();
    },
    get length() {

joelbarbosa

import { createQueue } from './queueu';

function createPriorityQueue() {
  const lowPriorityQueue = createQueue();
  const highPriorityQueue = createQueue();
  
  return {
    enqueue(item, isHighPriority = false) {
      isHighPriority
        ? highPriorityQueue.enqueue(item)

joelbarbosa

function createQueue() {
  const queue = [];
  
  return {
    enqueue(item) {
      queue.unshift(item);
    },
    dequeue() {
      return queue.pop();

joelbarbosa

/*
    Questions:
    * What do you think PFC.props is doing?
	    - Creating a Object with reference parameters, map your keys;
    * What is the concurrency variable good for?
	    - Its as especifique option where limits the number of Promise created.
    * sendOutStatusEmails ignores errors (except for logging them).
      Let's say your task was to make sure the whole function fails as soon sending out any
      email failed. How would you adjust the code?
	    - follows the code:

joelbarbosa

function bublesort(arr1) {
  const arr = [...arr1];
  let swap
  do {
  swap = false;
  for (i=0; i < arr.length-1; i++) {
    if (arr[i] > arr[i+1]) {
      let tmp = arr[i];
      arr[i] = arr[i+1];
      arr[i+1] = tmp;

joelbarbosa

// chunk
// Creates an array of elements split into groups the length of size.

const chunk = (input, size) => {
  return input.reduce((arr, item, idx) => {
    if (idx % size === 0) {
      return [...arr, [item]];
    } else {
      return [...arr.slice(0, -1), [...arr.slice(-1)[0], item]];
    }

joelbarbosa

declare var __DEV__: boolean;

declare module 'react-native' {

  declare type Color = string | number;

  declare type Transform =
    { perspective: number } |
    { scale: number } |
    { scaleX: number } |

joelbarbosa

// Return the total number of matching pairs of socks that John can sell.

// 9
// 10 20 20 10 10 30 50 10 20

// output
// 3

function sockMerchant(n, ar) {
    let totalPair=0;

joelbarbosa

boucing loading animation https://jsbin.com/xevusopuza/edit?html,css,output

joelbarbosa

const debounce = (fn, wait, immediate) => {
  let timeout;
  return () => {
    const later = () => {
      timeout = null;
      if (!immediate) fn.apply(this)
    }
    const callNow = immediate && !timeout;
    clearTimeout(timeout)
    timeout = setTimeout(later, wait)