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Homework Week 1

Topics discussed in class this week:
• Capturing user input 
• Events
• Basic DOM manipulations (img src, innerHTML)
• Code debugging using the browser 
• Code commenting
• Structuring code files
• Code formatting
• Handing in homework via PR

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

Step 0: Make a small dance

Give yourself (or your neighbor) a little tap on the shoulder, you've made it to JS2! 💪

Step 1: Implement feedback

Deadline Monday

Your fellow students and teachers have provided you with feedback on your last JavaScript1 homework in Trello.

  • Implement both feedback from Trello and Github.
  • Check on one of your fellow students code and issues and see if her or she implemented their feedback correctly. If there are some things that can be improved make an issue suggesting further improvements. If you think that the feedback has been implemented correctly create a issue saying something like: "nice work you can clear your issues".

Step 2: Custom DOM manipulation challenge 🎓

Deadline Saturday

Preparation: Fork this repository and use the Homework Pull Request Workflow to hand in your homework.

Modify the (mostly empty) files in the Week1/homework folder for this step.

2.1 Open the apps.js and start by declaring an array that contains 10 strings. These strings should be of book titles you have read (or made up) and be lowercase without spaces so that you can use these later as HTML id attributes. (Example: Harry Potter's - The Chamber of Secrets -> harry_potter_chamber_secrets). Add a console.log statement to output this array to console. (This is for debugging and making sure everything is in order. Delete it later when you're done :))

2.2 Open the empty index.html and add the required HTML to load the app.js file. Open index.html in the browser and confirm that the console.log statement shows the array. (Open the Chrome Developer Tools and inspect the console.)

2.3 Remove the temporary console.log from step 2.1. Make a function (or functions) that generate a ul with li elements for each book ID in the array using a for loop. Make sure that the function names you choose are an accurate reflection of what they do. As a reminder, here are the recommended Naming Conventions.

2.4 Make an object (not an array!) containing information for each book. Each property of this object should be another (i.e., nested) object with the book ID you thought up in step 2.1 as a key, and at least the following properties: title, language and author.

2.5 Now change the function from step 2.3 that you used to display the book ID's in a list to take the actual information about the book from the object and display that. Make sure you choose the correct HTML elements for each piece of info, for instance, a heading for the title.

2.6 Beautify your html page with css (use the style.css file for that), add sources and alts to each of the images.

2.7 Find and download book covers for each book and construct a new object which has as keys the book IDs again, and as value the path to the image source (e.g. { harry_potter_blabla: './img/harry_potter_blabla.jpg', ... }).

Loop over these entries (hint: Object.keys(objectName) gives you an array containing the keys). Then write a function which places an image at the corresponding li element. Remember that objects are not ordered, so you cannot guarantee that the first key is the first li element. (Hint: you could give each li item an id tag by modifying the function you made before.)

How to hand in your homework:

Go over your homework one last time:

  • Does every file run without errors and with the correct results when you run them with Node?
  • Does every file start with 'use strict';?
  • Have you used const and let and avoided var?
  • Do the variable, function and argument names you created follow the Naming Conventions?
  • Is your code well-formatted (see Code Formatting)?
  • Have you resolved all issues flagged by ESLint and the spell checker (no wavy red and green underlines in VSCode)?

If the answer is 'yes' to all preceding questions you are ready to follow these instructions:

Step 4: FreeCodeCamp challenges:

Deadline Sunday morning

And just for fun ... https://www.freecodecamp.com/challenges/sum-all-numbers-in-a-range

Step 5: Read before next lecture

Deadline Sunday morning

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

💥 Bonus homework 💥

the Bonus homework for this week (for those of you want an extra challenge) do the following:

Codewars is really a lot of fun, and you can compete against each other who has the most points :trollface: it’s a great way to really practice JavaScript a lot in various problems.

Please note, there are various challenges all sorted on difficultly called KIU. Kiu 8 is the easiest, Kiu 1 is the hardest, we expect you to do challenges around level 8, 7 maybe.

Enjoy!