gladchinda

function countryInfo(country) {
  const name = country.name;
  const region = country.region || 'the world';
  const code2 = country.codes.cca2;
  const dialcode = country.codes.dialcode;
  const cities = country.cities;
  
  return (
`
COUNTRY TIPS:

gladchinda

// OLD METHOD
const name = country.name;
const region = country.region || 'the world';
const code2 = country.codes.cca2;
const dialcode = country.codes.dialcode;
const cities = country.cities;

// ES6 DESTRUCTURING
const {
  name,

gladchinda

const person = {
  name: 'Glad Chinda',
  birthday: 'August 15'
}

// FUNCTION WITHOUT DESTRUCTURED PARAMETERS
function aboutPerson(person = {}) {
  const { name, birthday, age = 'just a few' } = person;
  
  console.log(`My name is ${name} and I'm ${age} years old. I celebrate my birthday on ${birthday} every year.`);

gladchinda

// Array Destructuring
const [red, green, blue] = color;

console.log(`R: ${red}, G: ${green}, B: ${blue}`);
// R: 240, G: 80, B: 124

gladchinda

const [,, blue] = color;

console.log(`B: ${blue}`);
// B: 124

gladchinda

function fetchDatabaseRecords(fromDate, toDate) {
  if (fromDate > toDate) {
    // swap the dates using array destructuring
    [fromDate, toDate] = [toDate, fromDate];
  }
  
  // ...execute database query
}

gladchinda

// The Rectangle constructor
function Rectangle(length, breadth) {
  this.length = length || 10;
  this.breadth = breadth || 10;
}

// An instance method
Rectangle.prototype.computeArea = function() {
  return this.length * this.breadth;
}

gladchinda

class Rectangle {
  // The class constructor
  constructor(length, breadth) {
    this.length = length || 10;
    this.breadth = breadth || 10;
  }
  
  // An instance method
  computeArea() {
    return this.length * this.breadth;

gladchinda

// An anonymous class expression
// assigned to a variable
const Rectangle = class {

  // The class constructor
  constructor(length, breadth) {
    this.length = length || 10;
    this.breadth = breadth || 10;
  }
  

gladchinda

class Rectangle {
  constructor(length, breadth) {
    this.length = length || 10;
    this.breadth = breadth || 10;
  }
  
  computeArea() {
    return this.length * this.breadth;
  }
}