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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>JavaScript First Steps</title>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/reveal.js/4.3.1/reset.min.css" integrity="sha512-Mjxkx+r7O/OLQeKeIBCQ2yspG1P5muhAtv/J+p2/aPnSenciZWm5Wlnt+NOUNA4SHbnBIE/R2ic0ZBiCXdQNUg==" crossorigin="anonymous" referrerpolicy="no-referrer" />
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<style>
.reveal code {
color: var(--r-link-color-hover);
}
</style>
</head>
<body>
<div class="reveal">
<div class="slides">
<section data-markdown>
<textarea data-template>
## JavaScript First Steps
### A [FrontendMasters](https://frontendmasters.com) course by [AnjanaVakil](https://twitter.com/AnjanaVakil)
[anjana.dev/javascript-first-steps](https://anjana.dev/javascript-first-steps)
</textarea>
</section>
<section data-markdown data-separator-vertical="\n--\n">
<textarea data-template>
# PART 3
--
### Goals
- Use while loops to repeat actions
- Differentiate asynchronous from syncronous code
- Use asynchronous functions to fetch data
- Use fancy modern JS syntax
- Learn real-world techniques for debugging & error handling
- Play with doggos!
---
Next project: Adapt our quiz for something cuter
<img src="https://media4.giphy.com/media/3o6wrdHsBoJKGaHjQk/giphy.gif?cid=790b76115baa58b80e31c3667efa5279bf10929f247d7752&rid=giphy.gif&ct=g" alt="Gif from Clueless of Cher saying excitedly 'Let's do a makeover!' with Dionne smiling excitedly in the background" />
--
[Doggo Fetch](./3-doggofetch-finished.html)
- Go to [anjana.dev/javascript-first-steps](https://anjana.dev/javascript-first-steps)
- In Part 3, go to the [starter](./3-doggofetch-starter.html) file
- Save & open in your text editor
--
<img src="https://media1.giphy.com/media/l0ErMA0xAS1Urd4e4/giphy.gif?cid=790b761117c3fdff6e37afdfc7134cf3f023217faf11ba6e&rid=giphy.gif&ct=g" alt="Gif from Clueless of Cher excitedly saying 'Project!'" />
</textarea>
</section>
<section data-markdown data-separator-vertical="\n--\n">
<textarea data-template>
## Loops ...continued
<img src="https://media3.giphy.com/media/dmwNbzYfECjGNRmEAM/giphy.gif?cid=790b761163dd284750f507d2339930b6b6f67478beff5de6&rid=giphy.gif&ct=g" alt="Gif of Cardi B saying 'I have to keep replaying it, replaying it, replaying it'" />
--
### `while` loops
let us run a chunk of code over & over if a `(condition)` is true
```js
let fiveRandomNumbers = [];
while (fiveRandomNumbers.length < 5) {
fiveRandomNumbers.push(Math.random());
}
```
--
Don't use `while (true)` unless you want to see your computer burn!
```js
while (true) {
console.log("I am wasting resources infinitely");
}
```
<img src="https://media2.giphy.com/media/yr7n0u3qzO9nG/giphy.gif?cid=ecf05e47n1a4v027fr8jlxwjoyhkxbrje74z19nphtvf63n2&rid=giphy.gif&ct=g" alt="Gif of Elmo with firey background" />
--
### Exercise
In the Doggo Fetch starter, follow TODO 1 to fill in the `getMultipleChoices` function using a `while` loop
</textarea>
</section>
<section data-markdown data-separator-vertical="\n--\n">
<textarea data-template>
## (A)synchronous code
<img src="https://64.media.tumblr.com/tumblr_m5q73kYQBy1qhjikro1_500.gif" alt="Gif of Cyndi Lauper singing 'Time after time'" />
Time & JS are ...frenemies
--
Usually, our JS code does things that are very quick
```js
console.log("This will print in a New York minute");
console.log("This will print one New York minute later");
```
So JS can usually run straight through our program "synchronously"
--
But when we need to do something that takes a long time
<img width=400 src="https://img.discogs.com/iY-SmCiof2l7QMiphjeU6Hn9Gj4=/fit-in/600x522/filters:strip_icc():format(jpeg):mode_rgb():quality(90)/discogs-images/R-798521-1462656116-4395.jpeg.jpg" alt="Cover of Paula Cole's 'I dont wanna wait'" />
we still want the web browser to keep working
--
JS can only do one task at a time ("single-threaded")
<img width="400" src="https://chiasuanchong.files.wordpress.com/2012/02/lady_gaga-telephone-coke-cans3.jpg" alt="Image of Lady Gaga from the video Telephone" />
JS says: *I cannot text you with a drink in my hand, eh*
<span style="font-size:small">Metaphor courtesy Daniel Higginbotham</span>
--
So when we give JS a task that takes a while, it doesn't stop and wait
```js
console.log("This will print first");
setTimeout(() => console.log("This will print third"), 1000);
console.log("This will print second");
```
it adds the slow task to a "TODO list" and keeps on running our program
The task runs some time later, "asynchronously"
--
Some things that take time:
- Waiting for user events
- Asking a user to pick a file
- Getting permission to access the camera/mic
- *Loading data from the interwebs*
--
Another thing that takes time:
- Learning about asynchronous JS
Add it to your TODO list!
- [MDN: Introducing Asynchronous JS](https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Asynchronous/Introducing)
- [Philip Roberts: What the heck is the event loop anyway?](https://www.youtube.com/watch?v=8aGhZQkoFbQ)
</textarea>
</section>
<section data-markdown data-separator-vertical="\n--\n">
<textarea data-template>
## Fetching data
<img src="https://media3.giphy.com/media/O1xeZ4AgSaNBS/giphy.gif?cid=ecf05e479mwf2ythgo0l5xraq88ps0gk4gx1zk4jsuef7kyt&rid=giphy.gif&ct=g" alt="Gif of dog playing fetch with a robotic ball throwing machine" />
--
URLs point to resources on the web
`https://images.dog.ceo/breeds/bluetick/n02088632_924.jpg`
<img src="https://images.dog.ceo/breeds/bluetick/n02088632_924.jpg" alt="Photo of a Bluetick dog" />
--
APIs provide URLs that point at data we care about
`https://dog.ceo/api/breed/hound/list`
```json
{
"message": [
"afghan",
"basset",
"blood",
"english",
"ibizan",
"plott",
"walker"
],
"status": "success"
}
```
--
`fetch()` lets us use JS to load data from APIs
```js
fetch("https://dog.ceo/api/breed/hound/list")
```
But if we run it in the console, we see something weird...
</textarea>
</section>
<section data-markdown data-separator-vertical="\n--\n">
<textarea data-template>
## Promises
<img src="https://media2.giphy.com/media/Bp01RYpqMwW136tjQg/giphy.gif?cid=ecf05e4735zhclf6w5pntjeeq2qzh14050pn03m1lzqznr6c&rid=giphy.gif&ct=g" alt="Gif from Insecure of Issa saying 'I promise you gon always be in my loop'" />
--
It takes time to fetch data from the network
```js
>> fetch("https://dog.ceo/api/breed/hound/list")
Promise { <state>: "pending" }
```
So JS writes us an "IOU" for the data value it doesn't have yet
aka a `Promise` of a value
--
Promises can be in 3 possible states:
- `pending`: still waiting for the value, hang tight
- `fulfilled` (aka "resolved"): finally got the value, all done
- `rejected`: sorry couldn't get the value, all done
It takes time for Promises to resolve, so they are "asynchronous"
--
JS adds the task to the TODO list and keeps running our program
<img src="https://media2.giphy.com/media/Tia13RncGbb05SUPve/giphy.gif?cid=ecf05e47icfvq0cyyvuexqew1vcockzorxi3ackmg5zdayie&rid=giphy.gif&ct=g" alt="Gif from Friends of Joey saying 'I wanna gooooo'" />
But our program needs the data, we want JS to stop and wait for the Promise to resolve
</textarea>
</section>
<section data-markdown data-separator-vertical="\n--\n">
<textarea data-template>
## `await`
<img src="https://media2.giphy.com/media/VIEy2m9UtWatviq1U6/giphy.gif?cid=ecf05e47b9mwi4ha9k3uli20dpkfod70c0ly17p4gtets8qa&rid=giphy.gif&ct=g" alt="Gif of Spice Girls singing 'Stop'" />
`await` lets us tell JS to stop and wait for an asynchronous operation to finish
--
In the case of a Promise, it waits for it to resolve before continuing with our code
```js
let response = await fetch("https://dog.ceo/api/breed/hound/list");
console.log(response);
```
The Promise we get from `fetch()` resolves to a `Response` object
--
It's `body` contains the data we care about
<img src="https://media3.giphy.com/media/ON5IJj2BmotiM/giphy.gif?cid=ecf05e47wmzome5hh8tc9k2vewizfznw6ne77jacd56c8tr5&rid=giphy.gif&ct=g" alt="Gif of the Spice Girls singing 'Slam your body down'" />
But we have to read the body somehow
--
Calling the `.json()` method on the response parses its body as a JSON object
```js
response.json()
```
But that gives us another Promise!
--
This is getting frustrating...
<img src="https://media0.giphy.com/media/5G98t8QjqBLK8/giphy.gif?cid=ecf05e47oqia9tg2xoks8h28ycs2r79sxrri4nw7qvec3lvz&rid=giphy.gif&ct=g" alt="Gif from Mean Girls of Regina George saying 'Stop trying to make fetch happen'" />
But don't give up!
--
Let's try again, this time `await`ing the JSON Promise too
```js
let response = await fetch("https://dog.ceo/api/breed/hound/list");
let body = await response.json();
```
--
`success`!!!
<img src="https://media3.giphy.com/media/3oKIPkMhoaMlhtarF6/giphy.gif?cid=ecf05e47oe7xk2v5w5dyybq39zzysptnonm2uz4qfqipp3nv&rid=giphy.gif&ct=g" alt="Gif from Mean Girls of Gretchen Wieners saying 'That is so fetch'" />
...but now we have to use the data!
</textarea>
</section>
<section data-markdown data-separator-vertical="\n--\n">
<textarea data-template>
## Destructuring
<img src="https://raw.githubusercontent.com/SaraVieira/open-source-stickers/master/stickers/deconstructing-unicorn/unicorn.png" alt="Destructuring an emoji unicorn " />
<span style="font-size:small;">Illustration by Sara Vieira</span>
--
Destructuring is a fancy way of declaring multiple variables at once
By "extracting" values from an object with their property names
```js
let {name, nickname} = spices[0];
```
--
If we only care about some of the properties, we can omit the others
```
let {nickname} = spices[2];
```
--
We can also destructure Arrays, assigning variables for their items
```js
const [baby, ginger, scary, sporty, posh] = spices;
```
--
We can ignore the values in the array we don't need
```js
const [emma, geri] = spices;
```
We can use commas to "skip" values
```js
const [,,melB] = spices;
```
--
We can use `...` to collect remaining values
```js
const [babySpice, ...adultSpices] = spices;
```
--
### Exercise
In your Doggo Fetch file, follow TODO 2 to complete the `getBreedFromURL` function with destructuring
The string method `.split()` will be useful - it returns an array of substrings by splitting a string at a certain character:
```js
let [first, middle, last] = "Anjana Sofia Vakil".split(" ");
```
--
*Back to our fetched data...*
Let's destructure the data we fetched so that we can use it!
```js
let { message } = body;
```
We only really care about the `message`
</textarea>
</section>
<section data-markdown data-separator-vertical="\n--\n">
<textarea data-template>
## `async` functions
Let's wrap all our async fetching & parsing code up into a function!
<img src="https://media4.giphy.com/media/3ornkdvPFqHxkC5QE8/giphy.gif?cid=ecf05e47ie2j2c7n436m52eykppvxmoydo7vuhjr7fqqdfm1&rid=giphy.gif&ct=g" alt="Gif of Buster saying 'Wrap it up'" />
--
If we try to `await` something in a regular `function`...
```js
function fetchResponse(url) {
const response = await fetch(url);
return response;
}
```
JS doesn't allow it
--
We need to make it an `async function`
```js
async function fetchResponse(url) {
const response = await fetch(url);
return response;
}
```
This tells JS to expect to `await` async operations inside the function
--
### Exercise
In your Doggo Fetch file, follow TODO 3 to fill in the `async function` body
Use what we've learned about how to fetch, parse, and extract the data we need!
</textarea>
</section>
<section data-markdown data-separator-vertical="\n--\n">
<textarea data-template>
## Putting our doggos to bed
Let's finish up the last TODOs, 4 & 5
They require you to practice skills you've learned so far
--
We're up & running with JS!!!
<img src="https://media3.giphy.com/media/GicdPSmxr5J1C/giphy.gif?cid=ecf05e473qqce70k7alrxq9k2ggus7k4wrwq4cs1ombjpx7h&rid=giphy.gif&ct=g" alt="Gif of dog riding a scooter" />
Amazing job!
</textarea>
</section>
<section data-markdown data-separator-vertical="\n--\n">
<textarea data-template>
## JS in the wild
<img src="https://media4.giphy.com/media/v9bipbbqgOmCSSpPgl/giphy.gif?cid=ecf05e47sa3nms325cej3243cl26ntt6wk6ntrn18zdjyqeb&rid=giphy.gif&ct=g" alt="Gif from The Matrix of Morpheus saying 'Welcome to the real world'" />
--
There is *lots* more we could say about JS
Let's talk about a few other concepts relevant to using JS in real life
</textarea>
</section>
<section data-markdown data-separator-vertical="\n--\n">
<textarea data-template>
## Modules
<img src="https://media0.giphy.com/media/l0JMrPWRQkTeg3jjO/giphy.gif?cid=ecf05e47pagiiw3sbae054ux0xw1q1i81rt4youv25pzuit2&rid=giphy.gif&ct=g" alt="Gif of Lego blocks building infinitely" />
Modules let us split big codebases across multiple files
--
### Top-level `await`
At the end of our doggo program we had to use `await` *outside* of a function
This isn't usually possible in JS...
--
Take a closer look at our `script` tag:
```html
<script type="module">
//...
</script>
```
JS *modules* work differently from JS *scripts*
--
One difference is that we can't use `await` outside of a function in a script
```html
<script>
await fetch("https://dog.ceo/api/breed/hound/list");
</script>
```
--
### Module scope
Another difference is that modules create their own scope
<img src="https://media3.giphy.com/media/3orif5bsHjTba3CLGo/200.webp?cid=ecf05e47xkq16kzrf5rt38bky39sqrcqsh83cfryjaqko5ta&rid=200.webp&ct=g" alt="Gif from the Simpsons of Bart watching a stretch limo close its door and pull away" />
Try loading the page and accessing the `BREEDS` variable we declare in the module
--
### `import` && `export`
<img src="https://media2.giphy.com/media/iQSdQ9IeLLPkA/giphy.gif?cid=790b7611b53a1470ae1664bd506c87e1695822e003a1e7ce&rid=giphy.gif&ct=g" alt="Gif from Big of Tom Hanks popping out of a limo sunroof and looking around" />
`export` lets us expose variables from our module's scope to the outside world
```js
// myModule.js
const veryUsefulFunction = () => "I came from a module";
export { veryUsefulFunction };
```
--
`import` lets us use an exposed variable from another module
```js
// otherModule.js
import { veryUsefulFunction } from './myModule.js'
veryUsefulFunction();
```
--
There's lots more to learn about modules!
[MDN > JS Guide > JS Modules](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules)
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## Debugging
<img src="https://img.buzzfeed.com/buzzfeed-static/static/2020-03/18/23/asset/756f49d8c6f3/anigif_sub-buzz-333-1584572906-9.gif" alt="Gif from Clueless of Cher standing in front of a chalkboard saying 'I was like totally buggin'" />
--
A certainty of coding (especially in JS):
<img src="https://media1.giphy.com/media/SRqXb3mwF1HCUY1IyE/giphy.gif?cid=ecf05e475h8uzbbhx011p9bkv243j6665g081k1au2ue2mc3&rid=giphy.gif&ct=g" alt="Gif of Rachael Kay Albers saying 'Spectacular failure is part of the game'" />
Stuff. Will. Go. Wrong!
--
`console.log()` (or `.warn()` or `.error()`) is one way to understand what's happening when your program runs
```js
function whyIsntThisWorking(input) {
console.log("Well at least we got this far");
console.log(input);
return thingThatDoesntWork(input);
}
```
--
You can also use the browser's debugger to *pause* JS and inspect what's happening
```js
function whyIsntThisWorking(input) {
debugger;
return thingThatDoesntWork(input);
}
```
The `debugger` statement creates a *breakpoint* where JS will pause and let you look around
--
Different browsers' debuggers work differently
- [Firefox](https://developer.mozilla.org/en-US/docs/Learn/Common_questions/What_are_browser_developer_tools#the_javascript_debugger)
- [Chrome](https://developer.chrome.com/docs/devtools/javascript/)
- [Safari](https://support.apple.com/guide/safari-developer/debugging-overview-devd24689f72/mac)
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## Error handling
Once we've discovered where in our program an error is likely, we can do something about it!
<img width="400" src="https://media2.giphy.com/media/TgmmI7eMFNJiOlC3gI/giphy.gif?cid=ecf05e47385ccmzt92sm6lcxk1hjnwnzpr6rnmy708aey0dc&rid=giphy.gif&ct=g" alt="Gif from Schitt's Creek of Alexis saying 'I will handle it'" />
--
Usually errors will cause JS to stop running our code
```js
thisThrowsAnError();
console.log("I'll never get here");
```
Sometimes that's appropriate and what we want JS to do
--
But sometimes we might want to try again, or try a different way
<img src="https://media0.giphy.com/media/xT9KVeEPWqBlmDLgME/giphy.gif?cid=790b76116463fd70b16cb492bedd196cac5283bbffc344c1&rid=giphy.gif&ct=g" alt="Gif from Clueless of Amber saying 'Whatever'" />
Or if it was optional, just skip it and move on with our (program's) lives
--
`try` lets us "watch out" for potential errors
its friend `catch` lets us manage errors when they occur
```js
try {
thisMightThrowAnError();
} catch (error) {
console.error("As if! Error:", error);
console.log("Whatever, let's press on anyway");
}
console.log("still rollin' with the homies");
```
--
Read all about it!
[MDN: JS > Statements > try...catch](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/try...catch)
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# RECAP
--
Look at all your badass new JS magic powers!
<img src="https://media1.giphy.com/media/KXGltmsUaqkVi/giphy.gif?cid=790b7611c63c92a1a12aff6c0b16dc918e318ab8dc4224d7&rid=giphy.gif&ct=g" alt="Gif from American Horror Story of Jessica Lange saying 'Who's the baddest witch in town'" />
--
### Values
### Arrays
### Objects
--
### Variables
### Functions
### Scope
--
### Events
### Conditionals
### Loops
--
### Asynchronous code
### Fancy syntax
### Real-world skills
--
Amazing job!!
<img src="https://media0.giphy.com/media/8xgqLTTgWqHWU/giphy.gif?cid=ecf05e47j4a84p60lj492d131mmsgf4y5inqgmpxa2ds7ld5&rid=giphy.gif&ct=g" alt="Gif of kid at retro computer giving thumbs up and looking satisfied" />
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</section>
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## Next steps
- Dig deeper with more FrontendMasters courses
- Refine your mental model with [Just JavaScript](https://justjavascript.com/) by Dan Abramov and Maggie Appleton
- Explore & investigate on [MDN](developer.mozilla.org) & elsewhere
- Keep tinkering!
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## Thank you!
Thanks to Marc Grabanski & Daniel Higginbotham for their help in creating this course
Slides powered by [reveal.js](https://revealjs.com)
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