flavioribeirojr

class Cart {
  constructor() {
    this.cart = []
  }

  onItemAddedToCart() {
    alert(`The cart has ${this.cart.length} items`)
  }

  addItemToCart(item) {

flavioribeirojr

class Cart {
  constructor() {
    this.cart = []
  }

  onItemAddedToCart() {
    alert(`The cart has ${this.cart.length} items`)
  }

  addItemToCart(item) {

flavioribeirojr

function createDriver(name) {
  return {
    drive: function () {
      console.log(`${name} is driving...`)
    }
  }
}

var vanDriver = createDriver('Rogerinho')

flavioribeirojr

function Driver(name) {
  this.name = name
}

Driver.prototype.drive = function () {
  console.log(`${this.name} is driving...`)
}

var vanDriver = new Driver('Rogerinho')

flavioribeirojr

function Rectangle(width, height) {
  this.width = width
  this.height = height
}

var rectangle = new Rectangle(30, 10)

console.log(rectangle.width, rectangle.height) // 30 10

flavioribeirojr

function stopMotorFunctions() {
  console.log(this.command);
}

var host = {
  command: 'Stop motor functions'
}

stopMotorFunctions.call(host) // Stop motor functions

flavioribeirojr

var dog = {
  name: 'Pluto',
  latido: 'Au',
  latir: function () {
    console.log(new Array(3).fill(this.latido).join(' '))
  }
}

dog.latir() // Au Au Au

flavioribeirojr

function sayMyName() {
  console.log(this.name)
}

var name = 'Heisenberg'

sayMyName() // Heisenberg

flavioribeirojr

console.log(typeof ([] + [])) // string

flavioribeirojr

import React, { Component } from 'react'
import ReactDOM from "react-dom";

class Input extends Component {
  render() {
    return (
      <div>
        <h2>Filho: {this.props.value}</h2>
        <input
          name={this.props.name}