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Homework Week 2

Topics discussed in class this week:
• Intro JavaScript (What is it, where can you use it for)
• Variables (var, let, const)
• Basic Data types (Strings, Numbers, Arrays, Booleans)
• Operators

Here you find the readings you have to complete before the third lecture.

Before you start with the homework:

  1. Review the Git course material of last week.
  2. Watch: What is programming, just watch the 2 min video, you do not have to do the entire JavaScript course (It could be useful later on though).
  3. Please watch the following parts of the course, Programming Foundations Fundamentals on Lynda.com (if you don't have access to Lynda yet ask Gijs):
    0. Introduction
    1. Programming Basics
    2. Core Programming Syntax
    3. Variables and Data Types

Step 2: JavaScript

Deadline Thursday

For all the following exercises create a new .js file. Try to find a proper name for each file or make a small comment about what it does inside for future reference.

1. Write a console.log statement saying "Hello World!" for each language that you know.

For example:

Halo, dunia! // Indonesian
Ciao, mondo! // Italian
Hola, mundo! // Spanish

2. Consider the following code:

console.log('I'm awesome');

Copy the code in your .js file and run it. You will see that you will get a SyntaxError. Find a solution for this error. Hint: read the error message carefully, it also gives an indication of where the problem is.

3. Declare a variable x and initialize it with an integer, using these exact steps:
3.1 First, declare your variable x (do not initialize it yet).
3.2 Add a console.log statement that explains in words what you think the value of x is, like in this example:

// TODO -> here you initialize your variable
console.log("the value of my variable x will be: whateverYouThinkItWillLog");

3.3 Add a console.log statement that logs the value of x.
3.4 Now initialize your variable x with an integer.
3.5 Next, add a console.log statement that explains what you think the value of x is.
3.6 Add a console.log statement that logs the value of x.
Steps to be taken:

// TODO -> here you declare your variable
console.log("the value of x will be: whateverYouThinkItWillLog");
// TODO -> log the actual value of x
// TODO -> here you initialize your variable
console.log("the value of x will be: whateverYouThinkItWillLog");
// TODO -> log value of x again

4. Declare a variable y and assign a string to it.
4.1 Write a console.log statement in which you explain in words what you think the value of the string is.
4.2 Now console.log the variable y.
4.3 Now assign a new string to the variable y.
4.4 Just like what you did before write a console.log statement that explains in words what you think will be logged to the console.
4.5 Now console.log y again.

// TODO -> here you declare AND assign your string
console.log("the value of my string will be: whateverYouThinkItWillLog");
// TODO -> log the actual value of the string to the console
// TODO -> assign a new value to your variable x
console.log("the value of my string will be: whateverYouThinkItWillLog");
// TODO -> log the actual value of the string to the console

5. How do you round the number 7.25, to the nearest integer (i.e., whole number)?
5.1 Declare a variable z and assign the number 7.25 to it.
5.2 console.log z.
5.3 Declare another variable a that has the value of z but rounded to the nearest integer.
5.4 console.log a.
5.5 So now we have z and a find a way to compare the two values and store the highest of the two in a new variable.
5.6 console.log the highest value.

6. Arrays
6.1 Declare an empty array. Make sure that the name you choose indicates 'plurality', because an array is capable of containing more than one element. (See Naming conventions).
6.2 Write a console.log statement that explains in words what you think the value of the array is.
6.3 console.log your array.
6.4 Create an array that has your favorite animals inside (see if you can find a good name that exactly describes what this variable will hold).
6.5 Log your array.
6.6 Add a statement that adds Daan's favorite animal ('baby pig') to the existing array.
6.7 Log your new array!

7. More strings
Let's consider the following string: let myString = "this is a test".
7.1 Add the string to your file and console.log it.
7.2 Find a way to get the length of myString.
7.3 console.log the length of myString.

8. Write a program that checks the types of two variables and prints out SAME TYPE if they are the same type.
8.1 First declare at least four variables and assign them different data types.
8.2 For each variable write a console.log statement that logs the value

let foo = 3;
console.log("The value of my variable foo is: " + foo);

(Curious to know what a foo is? Check this article on Wikipedia.)

8.3 Now write a console.log statement wherein you first explain in words what you think the type of your variables is.
8.4 Now use typeof to log the actual type of your variables.
8.5 Now compare the types of your different variables with one another.
8.6 Make sure to also show a message when the variables you are comparing are not the same type.

For example:

let x = 9;
let y = 'Hello';

if (...) {
    console.log('SAME TYPE');
}
// TODO -> add a way of giving feedback if your variables don't have the same type

9. If x equals 7, and the only other statement is x = x % 3, what would be the new value of x?
9.1 Add at least 3 console.log statements in which you show that you understand what % does.

10. Write a program to answer the following questions:
10.1 Can you store multiple types in an array? Numbers and strings? Make an example that illustrates your answer.
10.2 Can you compare infinities? (Not in Eyad's world) - does 6/0 === 10/0? How can you test this?
10.3 Add console.log statements to the above program in which you show that you understand the concepts (just like you've done in the above assignments).

Step 3: Some freeCodeCamp challenges (10 hours):

Deadline Saturday

On freeCodeCamp.com please do the Basic JavaScript exercises up and until the "Shopping List" exercise (there are some topics we did not cover but you can do it).

Step 4: Read before next lecture

Deadline Sunday morning

Go trough the reading material in the README.md to prepare for your next class

How to hand in Homework:

• Create a new repository "hyf-javascript1". Also create a new folder "week1" inside this repository.
• Upload your homework files inside the week1 folder and write a description for this “commit”.
• Your hyf-javascript1/week1 should now contain all your homework files.
• Place the link to your repository folder in Trello.

Hint

If you solve the FreeCodeCamp challenges and they are new concepts to you and you would like to take a look at them later on in the program, Copy your answers from FCC in a .js file and upload them to Github in a repository for future reference. In this way you build your own little documentation, if you look back at them first try to understand what it does before you run them.

⭐ Additional resources and review: ⭐