programming with javascript coursera week 3 quiz answers
Knowledge check: Introduction to Functional Programming
1. What will print out when the following code runs?
var globalVar = 77;
function scopeTest() {
var localVar = 88;
}
console.log(localVar);
- 77
- 88
- null
- undefined
3. When a function calls itself, this is known as _____________.
- Recursion
- Looping
- Higher-order Function
4. What will print out when the following code runs?
function meal(animal) {
animal.food = animal.food + 10;
}
var dog = {
food: 10
};
meal(dog);
meal(dog);
console.log(dog.food);
- 10
- 20
- 30
- 40
5. What value will print out when the following code runs?
function two() {
return 2;
}
function one() {
return 1;
}
function calculate(initialValue, incrementValue) {
return initialValue() + incrementValue() + incrementValue();
}
console.log(calculate(two, one));
- 1
- 2
- 3
- 4
Knowledge check: Introduction to Object-Oriented Programming
6. What will print out when the following code runs?
class Cake {
constructor(lyr) {
this.layers = lyr + 1;
}
}
var result = new Cake(1);
console.log(result.layers);
- 1
- 2
- 3
- 4
8. What will print out when the following code runs?
class Animal {
constructor(lg) {
this.legs = lg;
}
}
class Dog extends Animal {
constructor() {
super(4);
}
}
var result = new Dog();
console.log(result.legs);
- 0
- undefined
- null
- 4
Shuffle Q/A 1
9. What will print out when the following code runs?
class Animal {
}
class Cat extends Animal {
constructor() {
super();
this.noise = "meow";
}
}
var result = new Animal();
console.log(result.noise);
- undefined
- null
- “”
- meow
10. What will print out when the following code runs?
class Person {
sayHello() {
console.log("Hello");
}
}
class Friend extends Person {
sayHello() {
console.log("Hey");
}
}
var result = new Friend();
result.sayHello();
- Hello
- Hey
