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Homework

Get git ready to work on homework

Using the hyf-homework repo. In the terminal run git status

If there are changes that have not been committed, figure out what to do with those changes

  • Should they be committed to another branch?
  • Should they be committed to master?
  • Should they be discarded?

When you have figured out what to do with the changes and fixed those. Write git status again. If it says nothing to commit, working tree clean. Then you are ready to create the branch for this weeks homework.

Creating the branch

Using the hyf-homework repo write this command

git checkout master - You are now on the master branch

git checkout -b javascript-javascript1-week2

This will create and checkout the branch so you are ready make commits to it

This video can help. On slack use the #git-support channel to ask questions about git

Why should i even do this homework?

Functions and conditions are some of the basic building blocks of javascript. Functions ensure that we dont repeat ourselves when writing code. Conditions ensures that we can handle different cases when programming.

If you struggle to do this weeks homework there are a couple of things to do:

  • Watch the class recording. If it for some reason is missing. Then watch these: part 1, part 2
  • Read up on javascript basics here

Javascript warmup

Just like last homework, lets warmup our brain!

Do these freecodecamp challenges. We know this seems like a lot, but the tasks are not so big, so hang in there! If you get stuck on one of the tasks, just go to the next and then return to the difficult task later on.

Please add your freecodecamp username as answer for this exercise!

Step 3: Smart-ease - Goes Global!

Following the massive success of Smart-ease's first couple of products things have been quite hectic at Smart-ease's shared office space. The phone is constantly ringing from journalists wanting to interview the genius behind the success and the greatest developers want to work for you. Wired wrote an article with the headline "Smart-ease as good as Smarties"

BUT people are asking: What will be the next product that truly defines Smart-ease as the startup of the century?

Flight booking fullname function

Even for a startup as successful as Smart-ease there needs to be money in the bank. A customer from a flight booking website has asked for our help creating a specific part of their application:

When a user books a flight they write their firstname and surname, but when the ticket is printed a fullname should be displayed. It is our responsibility to create that.

Create a function called getFullname that returns a fullname. It should have two parameters: firstname and surname.

getFullname("Benjamin", "Hughes"); // returns "Benjamin Hughes"

Now try to create two variables fullname1 and fullname2 these two variables should be assigned to calling the getFullname function.

Log out the two fullname variables.

Formal fullname

On the flight website the user has the possibility to check a checkbox that indicates if the user wants to be adressed formally. Lets also change getFullname to include support for formal name.

Create an extra parameter useFormalName that is a boolean. If it is true the function should add a Lord in front of the name.

getFullname("Benjamin", "Hughes", true); // returns "Lord Benjamin Hughes"`
getFullname("Benjamin", "Hughes", false); // returns "Benjamin Hughes"

What do we do if useFormalName is not given as an argument?

Remember to consider someone calling the function with an empty string as firstname and lastname.

Try out your code by pasting your getFullname function in the javascript part of this codepen: https://codepen.io/hackyourfuture-cph/pen/jJWwbN

But what if the person is a woman? Describe how you would fix the getFullname so it also works for women

Event application

Another customer has contacted us. He works for a secret company that rimes with foogle. The customer works on their calendar application. They need some functionality to help with writing what weekday an event is held.

You specify how many days from today an event is being held. The function then figures out what weekday the event is being held. Here is an example:

Today is Sunday and the event is in 5 days. Therefore the event will be held on a friday.

// With todays weekday a tuesday
console.log(getEventWeekday(9)); // Logs out "Thursday"

// With todays weekday a Friday
console.log(getEventWeekday(2)); // Logs out "Sunday"

You should get the today's day from the system.

Hint: use remainder operator, array indexes and investigate new Date in js.

Weather wear

Create a function (that you have to name) that has temperature as parameter. Based on the temperature it should return a string with what the user should wear. You decide what the user should wear based on the temperature.

An example is:

const clothesToWear = youCreateThisFunctionName(18);
console.log(clothesToWear); // Logs out: "shorts and a t-shirt"

Wearing jackets

Student manager

A coding school have contacted us to make some functionality for managing their classes. We will create functionality for adding students to a class.

For this exercise you need to figure out how Array.push works. Learn about the concept by researching about it.

Copy the following code into your homework js file

const class07Students = [];
function addStudentToClass(studentName) {
  // You write code here
}

function getNumberOfStudents() {
  // You write code here
}

addStudentToClass function

The addStudentToClass should add the studentName to the class07Students array.

But there are some other requirements:

  • There can be only 6 students in a class. If more students are tried to be added, log out the following: "Cannot add more students to class 07".
  • The same person cannot be added to the class. If the same person is added to the class, log out the following: 'Student Benjamin is already in the class' where Benjamin is substituted for the studentName.
  • We are very fond of our Queen in Denmark, so if the Queen is added to the class she should always get a space. Even if the class has been filled out.
  • You cannot add an empty string to a class

getNumberOfStudents function

getNumberOfStudents should simply return the number of students in the class.

Now lets try and use the functions!

Try out all the cases:

  • Add some students to the class.
  • Add more students than there is space for
  • Add a student that is already in the class
  • Add the Queen to a full class
  • Call the getNumberOfStudents to log out the number of students.

To see your code applied on a webapp, go here: https://codepen.io/hackyourfuture-cph/pen/PLPmOB and paste your javascript code.

Candy helper optional

We are at the candystore. We have taken some shovels of the caramel-strawberry-cola-lemon-gravy winegums, a few of the banana chocolate diesel-motors and a handful of the salmon-potato covered toffee encrusted pizzas. But what is all this worth? And can you even afford it?

Let's solve this problem with some functions.

addCandy function

Create a function called addCandy. It has two parameters:

  • candyType - specifies the candy type. Could be 'sweet, chocolate, toffee or chewing-gum'
  • weight - specifies the weigth of the candy in grams

The function should add the price of the candy to an array called boughtCandyPrices using push

Here is an example of the usage:

addCandy("sweet", 20); // Adds the price of 20 grams of sweets to the array boughtCandyPrices

Candy table prices

Candy type Price per gram
Sweet 0.5
Chocolate 0.7
Toffee 1.1
Chewing-gum 0.03

Can i buy more?

Now create a variable called amountToSpend and assign it to Math.random() * 100. You can read about Math.random here

Create a new function called canBuyMoreCandy. This function returns a boolean indicating if the user can buy more candy using the boughtCandy array.

Try use the function by adding some pieces of candy and checking if you can buy more. If the user can buy more candy the console.log the following: "You can buy more, so please do!". If the user cant buy more console.log the following: "Enough candy for you!"

Hint: Use a for loop to calculate the total price of the candy pieces.

Optional Use a while loop instead of a for loop.

Step 4: Hand in Homework:

Watch this video for a more detailed go-through of how to hand in homework!

  • Use the branch called javascript-javascript1-week2
  • Add all your changes to this branch in the javascript-javascript1-week2 folder.
  • Create a pull request using the javascript-javascript1-week2 branch and give your PR the same name javascript-javascript1-week2
  • Wait for mentor feedback
  • Implement feedback, add, commit and push the changes
  • Now you can merge the changes into master
  • When merged you can share the github link to your classes slack channel if you are proud of what you did 💪
  • Now celebrate 🎉🎉🎉