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Programming with JavaScript Coursera Quiz Answers

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Also visit: Module quiz: The Building Blocks of a Program Quiz Answers

Module quiz: Programming Paradigms Quiz Answers

Question 1)
Variables declared using ‘let’ can be reassigned.

• true
• false

Question 2)
What will print out when the following code runs?

function scopeTest() {
var y = 44;
console.log(x);
}
var x = 33;
scopeTest();

• null
• undefined
• 33
• 44

Question 3)
What will print out when the following code runs?

class Cake {
constructor(lyr) {
this.layers = lyr;
}
getLayers() {
return this.layers;
}
}

• 0
• 2
• 5
• 10

Question 4)
What will print out when the following code runs?

class Animal {
}

class Dog extends Animal {
constructor() {
this.noise = "bark";
}

• bark
• growl
• undefined

Question 5)
Consider this code snippet: ‘const [a, b] = [1,2,3,4] ‘. What is the value of b?

• undefined
• 1
• 2
• [1,2,3,4]

Question 6)
What value will be printed out when the following code runs?

function count(...food) {
console.log(food.length)
}
count("Burgers", "Fries", null);

• 2
• 3
• “Burgers”, “Fries”, null
• “Burgers”, “Fries”, undefined

Question 7)
Which of the following are JavaScript methods for querying the Document Object Model? Select all that apply.

• getElementsByClassName
• getElementsById
• getElementById
• getElementByClassName
• queryAllSelectors
• querySelector

Question 8)
Which of the following methods convert a JavaScript object to and from a JSON string?

• JSON.parse
• JSON.stringify
• JSON.fromString
• JSON.toString

Question 9)
What will be the result of running this code?

const letter = "a"
letter = "b"

• Uncaught TypeError: Assignment to constant variable
• b
• a
• Uncaught SyntaxError: Invalid or unexpected token

Question 10)
What is a constructor?

• A function that is called to create an instance of an object.
• An instance of a class.
• A specific object that has been created using the class name.
• An object literal