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‎README.md‎

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Here you can find course content and homework for the JavaScript2 module
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|Week|Topic|Read|Homework|
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|----|-----|----|--------|
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|Week|Topic|Read|Homework|Lecture Notes|
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|----|-----|----|--------|--------|
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|1.|• Capturing user input through forms <br>• [Events](http://javascript.info/introduction-browser-events)<br>• [Basic DOM manipulations](../../../fundamentals/blob/master/fundamentals/DOM_manipulation.md)<br>• [Code debugging using the browser](http://javascript.info/debugging-chrome) <br>• [Code commenting](../../../fundamentals/blob/master/fundamentals/code_commenting.md)<br>• Structuring code files<br>• [Code formatting](../../../fundamentals/blob/master/fundamentals/code_formatting.md)<br>• [Handing in homework via PR](../../..//fundamentals/blob/master/fundamentals/homework_pr.md) |[Reading Week 1](/Week1/README.md)|[Homework Week 1](/Week1/MAKEME.md)|
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|2.|• Functions + JSON/Arrays<br>• [Array Manipulations](../../../fundamentals/blob/master/fundamentals/array_manipulation.md)<br>• JSON<br>• [Map and filter](../../../fundamentals/blob/master/fundamentals/map_filter.md)<br>• Arrow functions |[Reading Week 2](/Week2/README.md)|[Homework Week 2](/Week2/MAKEME.md)|
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|2.|• Functions + JSON/Arrays<br>• [Array Manipulations](../../../fundamentals/blob/master/fundamentals/array_manipulation.md)<br>• JSON<br>• [Map and filter](../../../fundamentals/blob/master/fundamentals/map_filter.md)<br>• Arrow functions |[Reading Week 2](/Week2/README.md)|[Homework Week 2](/Week2/MAKEME.md)|[Notes](/Week2/LECTURENOTES.md)
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|3.|• [Closures](../../../fundamentals/blob/master/fundamentals/scope_closures_this.md) <br>• Callbacks|[Reading Week 3](/Week3/README.md)|[Homework Week 3](/Week3/MAKEME.md)|
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## Test

‎Week2/LECTURENOTES.md‎

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### Lecture Notes Week 2
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#### Before class
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Slack message students for things they'd like to review before diving into new topics
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## Reviewing (11-11:30am)
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Cover individual topics that students may still be stuck on from previous lectures and homework
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## JSON (11:30am-12pm)
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* Illustration on Google Maps. How do people from Sweden speak to people from Sri Lanka?
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* [Advice Slip](https://adviceslip.com/) and [API](https://api.adviceslip.com/#endpoint-random). If they have machines that run on the programming language RUST, how can we communicate with them? They serialize their data to JSON!
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* Douglass Crawford
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* What is JSON?
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* Javscript Object Notation
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* We are fortunate that it's familiar and easy to understand :)
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* It is a STRING [PokeAPI](https://pokeapi.co/api/v2/pokemon/squirtle/)
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* Not all javascript objects are valid json
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* Coding exercise (lecture-exercise.js)
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* JSON.parse
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* Serialization vs Deserialization
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* JSON.stringify()
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* Other formats
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* protobufs
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* XML
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* GRPC?!
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* Cover homework question #3
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## Functions advanced (12-12:30pm)
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* Different ways functions can be made:
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* function declaration vs expression
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* arrow function
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* Omitting return, parameter parenthesis
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* What's a method?
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* Pure function? or side effects?
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* Example: how does a program run this? (example w/ a function, call of that function, and a console log)
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* Call stack (stack overflow)
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* Params
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* Extra params
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* Default params
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* Recursion (basic example)
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* Example function
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* pigs example?
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* countChar("kakkerlak", "k")? With DOM manipulation?
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* Simplicity of functions
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* while loop from [Chapter 5](http://eloquentjavascript.net/05_higher_order.html)
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* Higher order functions
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* repeat(n, action)
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* greaterThan10
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## Array Manipulations
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## Map, Filter, Reduce (others? every, some, etc)

‎Week2/MAKEME.md‎

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```
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Topics discussed this week:
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• Functions + JSON/Arrays
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• Array Manipulations
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• JSON
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• Map and filter
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• Arrow functions
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• Functions advanced
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• Array Manipulations
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• Map, filter, & reduce
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```
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> [Here](/Week3/README.md) you find the readings you have to complete before the third lecture.
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Repeat the previous step until all (= 2 in this case) tests pass.
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## Step 3: ROVER
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## Step 3: JSON parsing
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1. Create an HTML file
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2. Insert a script tag that points to squirtle-sprites.js
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3. In squirtle-sprites.js, call fetchPokemonData() and convert the JSON string it returns to a javascript object so you can access its properties
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4. Display the sprite images (located in the parsed object) in the HTML page. You'll need to do some DOM manipulation kinda of stuff (maybe element.appendChild?)
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*Bonus Challenge*: Can you use an array method to loop over all sprites so you don't have to manually type each?
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Finish up to chapter 7: JSON on [roverjs.com](http://roverjs.com/)!
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If the answer is 'yes' to all preceding questions you are ready to follow these instructions:
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- [Handing in homework](https://github.com/HackYourFuture/fundamentals/blob/master/fundamentals/homework_pr.md)
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### Do you have even more time?
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Read the _Eloquent Javascript_ chapters in the [Week 2 Readme](./README.md)

‎Week2/README.md‎

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```
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In week two we will discuss the following topics:
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• Functions + JSON/Arrays
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• Array Manipulations
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• JSON
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• Map and filter
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• Arrow functions
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• Functions advanced
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• Array Manipulations
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• Map, filter, & reduce
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```
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## Here are resources that we like you to read as a preparation for the coming lecture.
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### JSON
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- [JSON](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON) (MDN)
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- [FreeCodeCamp JSON](https://www.youtube.com/watch?v=B-k76DMOj2k)
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- [What is JSON and why does one use it?](https://www.quora.com/What-is-JSON-and-why-does-one-use-it/answer/Prid-Speed?ch=10&share=0b6f9763&srid=XxbK)
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### Map and Filter
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- :dizzy: [Fun fun functional](https://www.youtube.com/playlist?list=PL0zVEGEvSaeEd9hlmCXrk5yUyqUag-n84) :dizzy: Check the first 3-4 videos.
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### Code conventions
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- Code conventions: http://crockford.com/javascript/code.html
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### Array cardio
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- Wes Bos' awesome free tutorials. Just make a free account and do Array Cardio #1 [here](https://javascript30.com/)
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### From _Eloquent JavaScript_
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- Objects continued: http://eloquentjavascript.net/06_object.html
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## Recommended readings
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These chapters from _Eloquent JavaScript_ are a bit advanced, but give in-depth explanations of the topics that will be discussed during the lecture. If you have the time, try giving these chapters a read.
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This chapter from _Eloquent JavaScript_ gives in-depth explanations of the topics that will be discussed during the lecture. Highly recommended (if time permits).
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- Chapter 3 - [Functions](https://eloquentjavascript.net/03_functions.html)
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- Chapter 4 - [Data Structures: Objects and Arrays](https://eloquentjavascript.net/04_data.html)
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- Chapter 5 [Higher-Order Functions](https://eloquentjavascript.net/05_higher_order.html)
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- Chapter 3 - [Functions](http://eloquentjavascript.net/03_functions.html)
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- Chapter 5 - [Higher-Order Functions](http://eloquentjavascript.net/05_higher_order.html)
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#### For fun
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[The Weird History of JavaScript](https://www.youtube.com/watch?v=Sh6lK57Cuk4) shows just how haphazard the evolution of Javascript actually was.
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_Please go through the material and come to class prepared!_

‎Week2/example.html‎

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8" />
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<title>Sample exercise</title>
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<style>
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body {
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font-family: sans-serif;
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}
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#advice {
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color: slateblue;
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}
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</style>
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</head>
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<body>
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<h3>Here is your advice for the day:</h3>
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<h1 id="advice"></h1>
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<script type="text/javascript" src="./lecture-exercises.js"></script>
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</body>
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</html>

‎Week2/homework/squirtle-sprites.js‎

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‎Week2/lecture-exercises.js‎

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async function getRandomAdvice() {
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const adviceReq = fetch('https://api.adviceslip.com/advice'); // send request
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const adviceResponse = await adviceReq; // wait until something comes back
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// const jsonString = await adviceResponse.text();
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// return jsonString
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// const adviceData = JSON.parse(jsonString)
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// return jsonString
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const adviceData = await adviceResponse.json(); // parses JSON string into native JavaScript object
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return adviceData.slip.advice;
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}
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async function setRandomAdvice() {
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const adviceEl = document.getElementById('advice');
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adviceEl.innerText = await getRandomAdvice();
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}
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setRandomAdvice();

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