codeup-web-exercises/objects-lecture.html at main · Nathan-Haustveit/codeup-web-exercises · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Objects Intro</title>
</head>
<body>
<h1>Intro to Objects</h1>
<script>
  "use strict";
  /*
      JS Objects
      - like a named index array
      - used to store related state and behavior
      - where arrays are good for storing lists of data, objects store related aspects of a greater structure
      - we have already used objects: String, Array, Math, Number
   */
  // Creating Objects (dog, user, forecast, dictionaryEntry, movie, post, etc.)
  // New Object Instance
  var dog = new Object();
  console.log(typeof dog);
  // Object Literal Notation
  var cat = {};
  console.log(typeof cat);
  // Setting Properties on a Custom Object
  // create a pet object that has the following properties...
  // givenName
  // age
  // species
  // hasOffspring
  // valueInDollars

  var pet = {};
  pet.givenName = 'Freckles';
  pet.age = 4;
  pet.species = 'Dog';
  pet.hasOffspring = false;
  pet.valueInDollars = 2000;
  pet.isCute = true;
  pet.medicalHistory = {};
   pet.treatsEaten = [];

  pet.treatsEaten.push('Today he ate a bone');
  pet.treatsEaten.push('Today he ate a shoe');
  pet.treatsEaten.push('Today he ate a biscuit');
  console.log(pet);

  var pet = { givenName: 'Freckles', ageInYears: 4, species: 'Dog'};

  pet.ageInYears = 5;

  console.log(pet);


  // var pet = {};
  //
  // pet.givenName = 'Sparkles';
  // pet.age = 12;
  // pet.species = 'turtle';
  // pet.hasOffspring = true;
  // pet['value-in-dollars'] = 400; // alternative syntax for assigning properties
  // console.log(pet);
  // var pet2 = {
  //     givenName: 'Rex',
  //     age: 5,
  //     species: 'dog',
  //     hasOffspring: false,
  //     valueInDollars: 'priceless'
  // };
  // Peeking into an Object
  // console.log(pet);
  // Accessing Properties on an Object
  // console.log(pet.givenName);
  // console.log(pet2.givenName);
  // console.log(pet2['givenName']);
  //
  // pet.givenName = "Sabrina";
  // console.log(pet.givenName);
  // !! MINI-EXERCISE 1 !!
  // Nested Values
  // Add the following to a pet object...
  // altNames
  // vitals: averageTemp, restingHeartRate, isHungry
  var pet3 = {
      name: 'Bowser',
      age: 6,
      species: 'dog',
      hasOffspring: false,
      valueInDollars: 'priceless',
      altNames: [
          'Bowser Boy',
          'Bowser Man',
          'Bowser Buddy',
          'Puggle Wuggle Boy'
      ],
      vitals: {
          averageTempDegF: 101,
          averageRestingHeartRate: 80,
          isHungry: true
      }
  };
  // log if Bowser is hungry

  console.log(pet3.vitals.isHungry);

  // log Bowser's average heartRate

  console.log(pet3.vitals.averageRestingHeartRate);

  // log Bowser's most recent alternative name

  console.log(pet3.altNames[3])

  // change age to 7 and isHungry to false

  pet3.age = 7;
  pet3.vitals.isHungry = true;

  // Arrays of Objects
  var pets = [
      {
          givenName: 'Spot',
          isDog: true
      },
      {
          givenName: 'Max',
          isDog: false
      },
      {
          givenName: 'Goldy',
          isDog: false
      }
  ];

  for (var i = 0; i < pets.length; i += 1) {
    console.log(pets[i].givenName);
  }

  //change every pet's name to Bowser

  pets.forEach(function(pet){
    pet.givenName = 'Bowser';
  })

  // !! MINI EXERCISE 2 !!
  // Getting a List of Object Keys as an array
  // console.log(Object.keys(pet4));
  // Assigning Functionality to an Object
  // var pet4 = {
  //     name: "Pickles",
  //     age: 20,
  //     species: "horse",
  //     eat: function (food) {
  //         console.log("nom nom nom " + food);
  //     },
  //     gallop: function() {
  //         console.log("THUNK THUMP...THUNK THUMP!");
  //     }
  // };
  //
  // pet4.eat("carrots");
  // pet4.gallop();
  // The this Keyword
  // var pet6 = {
  //     name: "Sparky",
  //     age: 3,
  //     getOlder: function() {
  //         console.log(this.age);
  //         this.age += 1;
  //     }
  // };
  //
  // console.log(pet6.age);
  // pet6.getOlder();
  // console.log(pet6.age);
  // why use this vs. the object name: https://stackoverflow.com/questions/12799702/javascript-this-versus-object-name
  // !! MINI EXERCISE 3 !!
</script>
</body>
</html>