anthonymjimenez

public class PlasticToyDuck implements ToyDuck {

	@Override
	public void squeak() {
		System.out.println("Squeak squeak");
	}

}

public class ToySparrow implements ToyBird {

anthonymjimenez

public class PlasticToyDuck implements ToyDuck {

	@Override
	public void squeak() {
		System.out.println("Squeak squeak");
	}

}

public class ToySparrow implements ToyBird {

anthonymjimenez

const arrayOfBuiltIns = [
  Error,
  Symbol,
  Promise,
  RegExp,
  String,
  Boolean,
  Number,
  Array,
  Function,

anthonymjimenez

class Trip {
    constructor(destination, budget, duration) {
      this.destination = destination;
      (this.budget = budget), (this.duration = duration);
    }
  
    durationInHours() {
      return `${24 * this.duration} hours`;
    }
  }

anthonymjimenez

let myTrip = {
    destination: "Boston"
}
function findAndAddBudget(obj, argBudget) { 
    return ('budget' in obj) ? obj : {...obj, budget: argBudget}
}

console.log(myTrip) // { destination: 'Boston' }
myTrip = findAndAddBudget(myTrip, 600)
console.log(myTrip) // { destination: 'Boston', budget: 600 }

anthonymjimenez

function instanceOf(instance, obj) {
    return instance instanceof obj;
  }
  
function deleteProperty(instance, property, userObject = null) {
    if(typeof instance !== 'object') return `Primitive types like ${typeof instance} can not be deleted`
    let arrayWithUserType = userObject
    ? [userObject, ...arrayOfBuiltIns]
    : arrayOfBuiltIns;
  let foundType = arrayWithUserType.find((builtInObj) =>

anthonymjimenez

const newHello = new String('hello')

console.log(typeof newHello) // object
console.log(typeof []) // object

anthonymjimenez

const hello = 'hello'
const one = 1
console.log(hello instanceof String) // false
console.log(one instanceof Number) // false

console.log(typeof hello) // 'string'
console.log(typeof one) // 'number'

const newHello = new String('hello')
console.log(newHello instanceof Object) // true

anthonymjimenez

const arrayOfBuiltIns = [
  Error,
  Promise,
  RegExp,
  String,
  Boolean,
  Number,
  Array,
  Function,
  Object,

anthonymjimenez

console.log(instance.destination.sort()) // => ['Boston', 'Salem']
console.log(instance.sort()) // TypeError: instance.sort is not a function