Programming with JavaScript Quiz Answers – Networking Funda

All Weeks Programming with JavaScript Quiz Answers

Programming with JavaScript Week 01 Quiz Answers

Quiz 1: Self review: Declaring variables

Q 1: Did you complete the Declaring variables exercise?

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Yes

Q 2: Are you comfortable with using console.log?

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Yes

Q 3: Are you comfortable using the assignment operator?

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Yes

Quiz: Self Review – Advanced use of operators

Q 1: Did you complete the Advanced use of operators exercise?

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Yes

Q 2: Did you find any part of the exercise on the Advanced Use of Operators difficult?

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No

Q 3: Would you say that you are able to explain, in your own words, how logical operators &&, ||, and ! work in JavaScript?

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Yes

Quiz 3: Knowledge check: Welcome to Programming

Q 1: What is the data type of the value “Hello, World”?

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string

Q 2: What is the data type of the value true?

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boolean

Q 3: What is the % operator?

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The modulus operator

Q 4: What happens when you use the + operator on two strings?

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They get joined into a single string

Q 5: What is the operator symbol && represented in JavaScript?

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The logical AND operator

Q 6: What happens when you use the + operator on a string and a number?

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They get joined together as if both of them were strings

Q 7: What is the value of I after the following code runs?


 var i = 7;
 i += 1;
 i += 2;
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10

Quiz 7: Knowledge check – Conditionals and loops

Q 1:Based on the following code, what will print out when the variable I has the value 3?


  if(i < 5) {
    console.log("Hello");
  } else {
    console.log("Goodbye");
  }
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Hello

Q 2: Based on the following code, what will print out when the variable i has the value 1 ?


  if(i == 0 && i == 1) {
    console.log("Hello");
  } else {
    console.log("Goodbye");
  }
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Goodbye

Q 3: How many times will the following code print the word ‘Hello’?


  for (i = 0; i < 2; i++) {
      console.log("Hello");
  }
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2

Q 4: How many times will the following code print the word ‘Hello’?


  var i = 0;
  while(i < 3) {
    console.log("Hello");
    i++;
  }
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3

Q 5: How many times will the following code print the word ‘Hello’?


  for (i = 0; i < 2; i++) {
      for (var j = 0; j < 3; j++) {
          console.log("Hello");
      }​
  }
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6

Q 6: Based on the following code, what will print out when the variable i has the value 7?


  if(i <= 5) {
    console.log("Hello");
  } else if(i <= 10) {
    console.log("Goodnight");
  } else {
    console.log("Goodbye");
  }
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Goodnight

Q 7: Based on the following code, what will print out when the variable i has the value 3?


  switch(i) {
    case 1:
      console.log("Hello");
      break;
    case 2:
      console.log("Goodnight");
      break;
    case 3:
      console.log("Goodbye");
      break;
  }
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Goodbye

Q 8: Based on the following code, what will print out when the variable i has the value 3 ?


  if(i == 2 || i == 3) {
    console.log("Hello");
  } else {
    console.log("Goodbye");
  }
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Hello

Quiz 8: Module quiz: Introduction to JavaScript

Q 1: You can run JavaScript in a web browser’s dev tools console.

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true

Q 2: Which of the following are valid comments in JavaScript? Select all that apply.

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/ /Comment 2

Q 3: Which of the following are valid data types in JavaScript? Select all that apply.

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string

numbers

booleans

null

Q 4: Which of the following is the logical AND operator in JavaScript?

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&&

Q 5: Which of the following is the assignment operator in JavaScript?

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=

Q 6: How many times will the following code print the word ‘Hello’?

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6 

  for(var i = 0; i <= 5; i++) {
    console.log("Hello");
  }

Q 7: What will print out when the following code runs?


  var i = 3;
  var j = 5;

  if(i == 3 && j < 5) {
    console.log("Hello");
  } else {
    console.log("Goodbye");
  }
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Goodbye

Q 8: What will print out when the following code runs?


  var i = 7;
  var j = 2;

  if(i < 7 || j < 5) {
    console.log("Hello");
  } else {
    console.log("Goodbye");
  }
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Hello

Q 9: The result of! false is:

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t​rue

Q 10: What does the operator symbol || represent in JavaScript?

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The logical OR operator

Programming with JavaScript Week 02 Quiz Answer

Quiz 1: Knowledge check: Arrays, Objects and Functions

Q 1: What data type is the variable item?

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Array

  var item = [];

Q 2: What is the value of the result for the following code?

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2

  var result = “Hello”.indexOf(‘l’);

Q 3: What is the length of the clothes array after this code runs?


  var clothes = [];
  clothes.push('gray t-shirt');
  clothes.push('green scarf');
  clothes.pop();
  clothes.push('slippers');
  clothes.pop();
  clothes.push('boots');
  clothes.push('old jeans');
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3

Q 4: What value is printed out by the following code?


  var food = [];
  food.push('Chocolate');
  food.push('Ice cream');
  food.push('Donut');

  console.log(food[1])
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Ice cream

Q 5: How many properties does the dog object have after the following code is run?


  var dog = {
      color: "brown",
      height: 30,
      length: 60
  };
  dog["type"] = "corgi";
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4

Q 6: In the following function, the variables a and b are known as _______________.


  function add(a, b) {
      return a + b;
  }
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Parameters

Q 7: Which of the following are functions of the Math object?

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random()

sqrt()

Quiz 2: Knowledge check: Error handling

Q 1: What will be printed when the following code runs?


  var result = null;
  console.log(result);
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null

Q 2: When the following code runs, what will print out?


  try {​
    console.log('Hello');
  } catch(err) {​
    console.log('Goodbye');
  }​
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Hello

Q 3: If you pass an unsupported data type to a function, what error will be thrown?

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TypeError

Q 4: What will print out when the following code runs?


  var x;

  if(x === null) {
    console.log("null");
  } else if(x === undefined) {
    console.log("undefined");
  } else {
    console.log("ok");
  }
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undefined

Q 5: What will print out when the following code runs?


  throw new Error();
  console.log("Hello");
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Nothing will print out

Quiz 3: Module quiz: The Building Blocks of a Program

Q 1: What data type is the variable x?


  var x = {};
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Object

Q 2: What will be the output of running the following code? 

try {
console.log('hello)
} catch(e) {
console.log('caught')
}
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Caught

Q 3: What value is printed when the following code runs?


  var burger = ["bun", "beef", "lettuce", "tomato sauce", "onion", "bun"];
  console.log(burger[2]);
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lettuce

Q 4: In the following code, how many methods does the bicycle object have?


  var bicycle = {
      wheels: 2,
      start: function() {

      },
      stop: function() {

      }
  };
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2

Q 5: When the following code runs, what will print out?


  try {​
    throw new Error();​
    console.log('Hello');
  } catch(err) {​
    console.log('Goodbye');
  }​
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Goodbye

Q 6: If you mis-type some code in your JavaScript, what kind of error will that result in?

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TypeError

Q 7: Will the following code execute without an error?


  function add(a, b) {
    console.log(a + b)​
  }​

  add(3, "4");​
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Yes

Q 8: What will be printed when the following code runs?


  var result;
  console.log(result);
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undefined

Q 9: What will be the output of the following code?

var str = "Hello";
str.match("jello");
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null

Q 10: What will be the output of the following code?

try {
Number(5).toPrecision(300)
} catch(e) {
console.log("There was an error")
}
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“There was an error”

Programming with JavaScript Week 03 Quiz Answer

Quiz 1: Knowledge check: Introduction to Functional Programming

Q 1: What will print out when the following code runs?


    var globalVar = 77;

    function scopeTest() {
        var localVar = 88;
    }

    console.log(localVar);
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undefined

Q 2: Variables declared using const can be reassigned.

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false

Q 3: When a function calls itself, this is known as _____________.

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Recursion

Q 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);
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30

Q 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));
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4

Quiz 2: Knowledge check: Introduction to Object-Oriented Programming

Q 1: 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);
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2

Q 2: When a class extends another class, this is called ____________.

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Inheritance

Q 3: 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);
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4

Q 4: 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);
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undefined

Q 5: 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();
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Hey

Quiz 3: Knowledge check: Advanced JavaScript Features

Q 1: What will print out when the following code runs?


    const meal = ["soup", "steak", "ice cream"]
    let [starter] = meal;
    console.log(starter);
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soup

Q 2: The for-of loop works for Object data types.

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false

Q 3: What will print out when the following code runs?


    let food = "Chocolate";
    console.log(`My favourite food is ${food}`);
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My favourite food is Chocolate

Q 4: What values will be stored in the set collection after the following code runs?


    let set = new Set();
    set.add(1);
    set.add(2);
    set.add(3);
    set.add(2);
    set.add(1);
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1, 2, 3

Q 5: What value will be printed out when the following code runs?


    let obj = {
        key: 1,
        value: 4
    };

    let output = { ...obj };
    output.value -= obj.key;

    console.log(output.value);
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3

Q 6: What value will be printed out when the following code runs?


    function count(...basket) {
        console.log(basket.length)
    }

    count(10, 9, 8, 7, 6);
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10, 9, 8, 7, 6

1, 2, 3, 4, 5

6

5

Quiz 4: Knowledge Check – JavaScript in the browser

Q 1: In the following code, the type attribute can be omitted.


    <script type="text/javascript">
        //Comment
    </script>
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true

Q 2: What does the document variable return in JavaScript?


    console.log(document);
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The entire webpage in the browser’s memory, as a JavaScript object.

.

Q 3: What does the following function return?


    getElementById('main-heading')
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The first element that has the id attribute with a value main-heading

Q 4: After the following code is run, what will happen when the user clicks on a p element in the browser?


    document.querySelector('h1').addEventListener('click', 
        function() { 
            console.log('clicked');
        });
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Nothing.

Q 5: What will be printed when the following code runs?


    var result = {
      value: 7
    };
    console.log(JSON.stringify(result));
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{“value”: 7}

Quiz 5: Module quiz: Programming Paradigms

Q 1: Variables declared using ‘let’ can be reassigned.

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true

Q 2: What will print out when the following code runs?


    function scopeTest() {
        var y = 44;

        console.log(x);
    }

    var x = 33;
    scopeTest();
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33

Q 3: What will print out when the following code runs?


    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());
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10

Q 4: What will print out when the following code runs?


    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());
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bark

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

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2

Q 6: What value will be printed out when the following code runs?


    function count(...food) {
        console.log(food.length)
    }

    count("Burgers", "Fries", null);
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3

Q 7: Which of the following are JavaScript methods for querying the Document Object Model?

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1.getElementsByClassName
2.getElementById
3.querySelector

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

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1.JSON.toString
2.JSON.stringify

Q 9: What will be the result of running this code?

const letter = "a"
letter = "b"
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Uncaught TypeError: Assignment to constant variable 

Q 10: What is a constructor?

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A function that is called to create an instance of an object.

Programming with JavaScript Week 04 Quiz Answer

Quiz 1: Knowledge check: Introduction to testing


Q 1:What is the correct way to export the timesTwo function as a module so that Jest can use it in testing files?

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module.exports = timesTwo

Q 2: Testing is a way to verify the expectations you have regarding the behavior of your code

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true

Q 3: Node.js can be used to build multiple types of applications. Select all that apply.

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Command line applications

Desktop applications

Web application backends

Q 4: When the following test executes, what will the test result be?


    function add(a, b) {
        return a + b;
    }

    expect(add(10, 5)).toBe(16);
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Fail.

Q 5: Which of the following is the slowest and most expensive form of testing?

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End-to-end testing (e2e)

Q 6: Mocking allows you to separate the code that you are testing from its related dependencies.

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true

Quiz 2: Module quiz: Testing

Q 1: What is unit testing?

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Unit testing revolves around the idea of having separate, small pieces of code that are easy to test.

Q 2: When the following test executes, what will the test result be?


    function subtract(a, b) {
        return a - b;
    }

    expect(subtract(10, 4)).toBe(6);
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Success.

Q 3: What is End-to-end testing (e2e)?

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End-to-end testing tries to imitate how a user might interact with your application.

Q 4: What is Code Coverage?

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A measure of what percentage of your code is covered by tests.

.


Q 5: Node.js can be used to build web application backends.

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true

Q 6: When the following test executes, what will the test result be?


    function multiply(a, b) {
        return a;
    }

    expect(multiply(2, 2)).toBe(4);
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Fail.

Q 7: Which command is used to install a Node package?

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npm

Q 8: Which file lists all your application’s required node packages?

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package.json

Q 9: A person on your team wants to help with testing. However, they are not a developer and cannot write code. What type of testing is most suited for them?

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End-to-end testing

Q 10: What is the recommended way to separate the code that you are testing from its related dependencies?

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module.exports

Programming with JavaScript Week 05 Quiz Answer

Q 1: What will be the output of the following JavaScript?


const a = 10;
const b = 5;
if(a == 7 || b == 5) {
    console.log("Green");
} else {
    console.log("Blue");
}
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Green

Q 2: What will be the output of the following JavaScript?


var x = true;
x = 23;
console.log(x);
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23

Q 3: What is the data type of the x variable in the following code?


var x = 0 != 1;
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Number

Q 4: What will the following JavaScript code output?


var x = 20;

if(x < 5) {
    console.log("Apple");
} else if(x > 10 && x < 20) {
    console.log("Pear");
} else {
    console.log("Orange");
}
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Orange

Q 5: What will the following JavaScript code output?


var result = 0;

var i = 4;
while(i > 0) {
    result += 2;
    i--;
}

console.log(result);
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8

Q 6: When the following code runs, what will print out?


try {
    throw new Error();
    console.log('Square');
} catch(err) {
    console.log('Circle');
}
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Circle

Q 7: What’s missing from this JavaScript function declaration?


function(a,b) {
    return a + b
}
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The function name.

Q 8: What is the output of the code below?


var cat = {}
cat.sound = "meow"
var catSound = "purr"
console.log(cat.sound)
View
meow

Q 9: What is the output of the code below?


var veggies = ['parsley', 'carrot']
console.log(veggies[2])
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undefined

Q 10: Which of the following HTML attributes is used to handle a click event?

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onclick

‘

Q 11: How can you add an HTML attribute to an HTML element using JavaScript?

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By invoking the setAttribute method on a given element.

Q 12: What does this code do?


function addFive(val) {
  return val + 5;
};
module.exports = addFive;
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It defines the addFive function and exports it as a Node module so that it can be used in other files.

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