What will print out when the following code runs? <pre> function scopeTest() { var y = 44; console.log(x); } var x = 33; scopeTest();</pre>

That's correct! x is defined in the global scope before the console.log is called.

What value will be printed out when the following code runs? <pre> function count(...food) { console.log(food.length) } count("Burgers", "Fries", null);</pre>

That's correct! The rest operator ... allows a function to accept an indefinite amount of parameters. The length property of the food variable will return 3 because there were 3 parameters passed to the method call. The value null counts as a parameter. Therefore, 3 will be printed out.

What will be the result of running this code? <pre>const letter = "a" letter = "b"</pre>

That's correct. You cannot reassign a variable assigned using the const keyword.

Module Quiz: Programming Paradigms » Week 3 » Programming With JavaScript

Q: Module quiz: Programming Paradigms

That's correct! Variables declared using let cannot be redeclared but can be reassigned.

Q: What will print out when the following code runs? <pre> class Cake { constructor(lyr) { this.layers = lyr; } getLayers() { return this.layers; } } class WeddingCake extends Cake { constructor() { super(2); } getLayers() { return super.getLayers() * 5; } } var result = new WeddingCake(); console.log(result.getLayers());</pre>

That's correct! The WeddingCake constructor stores the amount of layers as 2. However, WeddingCake overrides the getLayers() function to multiple the result by 5. Therefore, 10 is outcome.

Q: What will print out when the following code runs? <pre> class Animal { } class Dog extends Animal { constructor() { this.noise = "bark"; } makeNoise() { return this.noise; } } class Wolf extends Dog { constructor() { super(); this.noise = "growl"; } } var result = new Wolf(); console.log(result.makeNoise());</pre>

That's correct! The noise property is overridden when the Wolf constructor is called.

Q: Consider this code snippet: 'const [a, b] = [1,2,3,4] '. What is the value of b?

That's correct! The value b is assigned the second item value of the array through de-structuring.

Q: Which of the following are JavaScript methods for querying the Document Object Model? Select all that apply.

That's correct! getElementsByClassName will return all elements with the specified class.<br>That's correct! getElementById will return the first matching element with the specified ID. <br>That's correct! querySelector will return all elements matching the specified CSS selector.

Q: Which of the following methods convert a JavaScript object to and from a JSON string?

That's correct! JSON.parse will convert a JSON string to a JavaScript object. <br>That's correct! JSON.stringify will convert a JavaScript object to a JSON string.