Destructing Objects

destructuringObjs.js

'use strict';
// Data needed for a later exercise
const flights =
  '_Delayed_Departure;fao93766109;txl2133758440;11:25+_Arrival;bru0943384722;fao93766109;11:45+_Delayed_Arrival;hel7439299980;fao93766109;12:05+_Departure;fao93766109;lis2323639855;12:30';

// Data needed for first part of the section
const restaurant = {
  name: "Vini's Curry House",
  location: '123 Gora Way, Mumbai, India',
  categories: ['Punjabi', 'Bengali', 'Madras', 'Neplai'],
  starterMenu: ['Samosa', 'Pakora', 'Nan', 'Kebab'],
  mainMenu: ['Dosa', 'Chicken Madras', 'Tandoori Halibut'],

  openingHours: {
    thu: {
      open: 12,
      close: 22,
    },
    fri: {
      open: 11,
      close: 23,
    },
    sat: {
      open: 0, // Open 24 hours
      close: 24,
    },
  },

  order: function (starterIndex, mainIndex) {
    return [this.starterMenu[starterIndex], this.mainMenu[mainIndex]];
  },

  orderDelivery: function ({ starterIndex = 1, mainIndex = 0, time = '24.07', address }) {
    console.log(
      `Order received! ${this.starterMenu[starterIndex]} and ${this.mainMenu[mainIndex]} will be delivered ${address} at ${time}. `
    );
  },
};

restaurant.orderDelivery({
  time: '22:30',
  address: '123 High Five Way',
  mainIndex: 2,
  starterIndex: 2,
});

restaurant.orderDelivery({
  address: '123 High Five Way',
  starterIndex: 1,
});

// Destructuring objects

// objects order doesn't matter
// good for results from API calls
// write a lot less code!

const { name, openingHours, categories } = restaurant;
console.log(name, openingHours, categories);

// variable names different from property names!

console.log('---------');

const {
  name: restaurantName,
  openingHours: hours,
  categories: tags,
} = restaurant;
console.log(restaurantName, hours, tags);

// default values

const { menu = [], starterMenu: starters = [] } = restaurant;
console.log(menu, starters);

// mutating variables

let a = 111;
let b = 999;

const obj = { a: 23, b: 7, c: 14 };

// must use ()
({ a, b } = obj);
console.log(a, b);

// nested objects

const {
  fri: { open, close },
} = openingHours;
// 11 and 23 will print out
// representing the hrs of operation
console.log(open, close);

// cool application of all this!

// pass an object as para into a f(x);

restaurant.orderDelivery({
  time: '22:30',
  address: '123 High Five Way',
  mainIndex: 2,
  starterIndex: 2,
});