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/**
 * To run this script:
 * npx tsx ./react-colocation-example-1.ts
 */

// Product type
interface Product {
  id: string;
  price: number;
  quantity: number;

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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

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node: Platform built on V8 to build network applications
git: Distributed revision control system
wget: Internet file retriever
yarn: JavaScript package manager
python3: Interpreted, interactive, object-oriented programming language
python: Interpreted, interactive, object-oriented programming language
mysql: Open source relational database management system
coreutils: GNU File, Shell, and Text utilities
openssl: SSL/TLS cryptography library
postgresql: Object-relational database system

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// hell
function hell() {
  step1(a => {
    step2(b => {
      return a + b
    })
  }) 
}

// heaven

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const data = [1,2,3,4,5,6,7,8,9,10,1,2,3]

const findDuplicates = (data) => {
	const hashMap = {}
  data.forEach((value) => {
  	hashMap[value] = (hashMap[value] || 0)  + 1
  })
  
  return Object.entries(hashMap).reduce((acc, [value, nbOfItems]) => {
    if (nbOfItems <= 1) {

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Introduction

Card payments with Stripe should be performed with PaymentIntents.

This API was created to handle modern payments, where the cardholder's bank may require the user to authenticate themselves with the bank before a payment can be authorized.

Authentication requirements first started to appear with European banks regulated by PSD2 which introduced [Strong Customer Authentication

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const getArrayCombinations = array => {
  let combinations = []

  for (let i = 0; i < array.length - 1; i++) {
    for (let j = i + 1; j < array.length; j++) {
      combinations.push([
        {
          value: array[i],
          position: i,
        },

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export const getNextQuarterHourFromDate = (date: Date) => {
  const dateToReturn = new Date(date)

  dateToReturn.setSeconds(0)
  dateToReturn.setMinutes(Math.ceil(dateToReturn.getMinutes() / 15) * 15)
  return dateToReturn
}

console.log({
  scenario: "getNextQuarterHourFromDate(new Date('1995-12-17T03:00:00.000Z'))",

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interface IComments {
  id: number,
  children?: IComments
  parentId: number | null,
  content: string
}

const nest = (items, id = null, linkKey = 'parentId') => (
  items
    .filter((item) => item[linkKey] === id)

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var capitalize = function(value) {
  return value.replace(/\b\w/g, function(match) { return match.toUpperCase(); })
}