class Animal {
//making a class and it is called animal
constructor(name, species, sex) {
//setting attributes of the object/class
//need to use the word "constructor"
this.species = species;
this.sex = sex;
this.name = name;
this.stomach = [];
}
eat(food) {
this.stomach.push(food);
//function that takes in food and adds it to the array
}
poop() {
var randomAmount = Math.round(Math.random() * (this.stomach.length - 1));
//math.random is a random number generator that gives you a number betwen 0 and 1
//this.stomach.length will take the length of the array (number of items in the stomach) and subtracts one
var doggyBag = [];
for (var i = 0; i < randomAmount; i++) {
doggyBag.push(this.stomach.pop());
}
//moves it too the doggyBag
return doggyBag;
}
introduce() {
return `Hi, my name is ${this.name}. I'm a ${this.sex} ${this.species}.`;
}
}
{
var matt = new Animal("Matt", "Human", "male");
matt.eat("pizza");
matt.eat("chocolate");
matt.eat("beef");
matt.poop();
return matt.stomach;
}
//each time you run it you could get something different because it is random. will add or subtract to array
class Dog extends Animal {
//class dog is going to "steal" attributes of Animal. Really it now has access to those attributes.
constructor(name, sex, breed) {
super(name, "dog", sex); //"super" refers to the "superclass," or the class we are extending
this.breed = breed;
//on top of those attributes from animal, we are adding breed
}
introduce() {
// extend superclass method
return super.introduce() + " Woof woof!";
}
bark() {
return "woof";
}
}
chase = new Dog("Chase", "male", "chihuahua")
chase.introduce()
chase.bark()
chase.breed
{
class Robot {
constructor() {
// static property
Robot.totalUnits = Robot.totalUnits + 1 || 1;
//actually refering to this class of robots
this.serialNo = Robot.totalUnits;
}
introduce() {
return "Hello. I am unit " + this.serialNo + " of " + Robot.totalUnits;
}
}
var robo1 = new Robot();
//if returned at this point, woudl be unit 1 of 1, because we have not added additional robots
var robo2 = new Robot();
var robo3 = new Robot();
var robo4 = new Robot();
return robo1.introduce();
}
class Stat {
constructor(stat) {
this.stat = stat;
}
static combineStats(stat1, stat2) {
return new Stat(stat1.stat + stat2.stat);
}
}
statA.stat
statA.combineStats(statA, statB)
Stat.combineStats(statA, statB)
clif = new Dog('Clif', 'male', 'Big Red')
clif instanceof Dog
clif instanceof Animal
Dog instanceof Animal // why is this false?
//dog is an extension of animal
class Robot {
//write code here
}
class FastRobot /*code here*/ {
//code here
}
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Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
