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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Class 4 ~ Intermediate JS ~ Girl Develop It</title>
<meta name="description"
content="This is a proposed Girl Develop It NYC Intermediate JavaScript curriculum. The course is meant to be taught in 4 two-hour sections.">
<meta name="author" content="Girl Develop It">
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/gdidefault.css" id="theme">
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<!-- light editor<link rel="stylesheet" href="lib/css/light.css">-->
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link.rel = 'stylesheet';
link.type = 'text/css';
link.href = 'css/print/pdf.css';
document.getElementsByTagName('head')[0].appendChild(link);
}
</script>
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<link rel="stylesheet" href="css/print/pdf.css" type="text/css" media="print">
<link rel="icon" type="image/x-icon" href="favicon.ico" />
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<div class="slides">
<section>
<img src="img/circle-gdi-logo.png" alt="GDI Logo" class="noborder">
<h2>Intermediate JavaScript</h2>
<h3>Class 4</h3>
</section>
<section>
<h1>Agenda</h1>
<ul>
<li>Review Quiz</li>
<li>Quiz App: last steps</li>
<li>Other APIs</li>
<li>Goodbye!😢</li>
</ul>
</section>
<section>
<section>
<h1>Review Quiz</h1>
<h3>⬇</h3>
</section>
<section>
<p>What could be improved in the following code?</p>
<pre class="fragment"><code class="javascript" data-trim contenteditable>
let students = ["Bob","Amy","Betty","Bill","Marge","Charlotte","Shawn","Pedro"];
let longestName = function(){
let output = "";
for(let i = 0; i < students.length; i++){
let name = students[i];
if(name.length > output.length){
output = name;
}
}
return output;
}
longestName();
</code></pre>
<pre class="fragment"><code class="javascript" data-trim contenteditable>
// preference for const
const students = ["Bob","Amy","Betty","Bill","Marge","Charlotte","Shawn","Pedro"];
// Keep array reference within function as parameter (more versatile)
const longestStr = function(arr){
let output = "";
for(let i = 0; i < arr.length; i++){
const str = arr[i];
output = str.length > output.length ? str : output;
}
return output;
}
longestStr(students); // must pass data into fun ction as argument
</code></pre>
</section>
<section>
<p>What is the value of pikachu.health?</p>
<pre class="fragment"><code class="javascript" data-trim>
const pikachu = {
health: 10,
defense: 5
}
const charmander = {
punch: function(obj){
const damage = 12 - obj.defense;
obj.health -= damage;
}
}
charmander.punch(pikachu);
</code></pre>
<pre class="fragment"><code class="javascript" data-trim>
pikachu.health; // (10 - (12 - 5)) == (10 - 7) == 3
</code></pre>
</section>
<section>
<p>How would you get all divs with a class of "xyz" from the DOM?</p>
<pre class="fragment"><code class="javascript" data-trim>
const divs = document.querySelectorAll("div.xyz");
</code></pre>
</section>
<section>
<p>Why does the following console.log() print "undefined?"</p>
<pre class="fragment"><code class="javascript" data-trim>
const URL = "https://some-api.com/api";
let info;
fetch(URL)
.then(r=>r.json())
.then(data=>{
info = data;
})
console.log(info); // undefined
</code></pre>
<p class="fragment">The asynchronous fetch() call does not reassign the "info" variable before the console.log() executes</p>
</section>
</section>
<section>
<h2>Events</h2>
<p class="fragment">An events is some notable moment for an element, such as when a user:</p>
<ul>
<li class="fragment">scrolls on the page</li>
<li class="fragment">clicks an elements</li>
<li class="fragment">presses a certain key</li>
</ul>
<br>
<br>
<p class="fragment">Check out <a href="https://developer.mozilla.org/en-US/docs/Web/Events" target="_blank">all of the events</a> that can occur on a website</p>
</section>
<section>
<h2>Event Handlers</h2>
<p class="fragment">An event handler is a callback function that can be assigned to an element to <strong>trigger</strong> when an event occurs</p>
<pre class="fragment"><code class="javascript" data-trim contenteditable>
const button = document.querySelector("button");
button.addEventListener("click",handleClick);
function handleClick(event){
// event is an Event object with information about the event
alert("Don't press me!");
}
</code></pre>
</section>
<section>
<h2>Let's Develop It!</h2>
<p>In the "mainProject" folder, go into "class_4", and edit the "script.js" file</p>
<ul>
<li>Finish up last tasks!</li>
</ul>
<pre><code class="javascript" data-trim contenteditable>
const button = document.querySelector("button");
button.addEventListener("click",handleClick);
function handleClick(event){
// event is an Event object with information about the event (check it out!)
alert("Don't press me!");
}
</code></pre>
</section>
<section>
<h2>The final product</h2>
<p><a href="mainProject/class_4/index_SOLUTION.html" target="_blank">This</a> is what we made!</p>
<img src="img/quiz_app.PNG" alt="">
</section>
<section>
<h1><br/></h1>
</section>
<section>
<h2>Working with other APIs</h2>
<p class="fragment">Not all APIs are created equal - there are 3 main ways to access an API</p>
<ol>
<li class="fragment">Open to all - no authentication required!</li>
<li class="fragment">Requires developer account and authentication key...
<ol>
<li class="fragment">which can be part of the request URL</li>
<li class="fragment">which must go in the request header</li>
</ol>
</li>
</ol>
</section>
<section>
<h2>APIs open to all</h2>
<p class="fragment">Anyone can use these without needing permission or authentication!</p>
<ul>
<li class="fragment">💲Free!💲</li>
<li class="fragment">Usually has a low limit on the number of requests that can be made from the same IP address</li>
<li class="fragment">A server is costly to maintain, and without proper backing many Open APIs shut down - making them less reliabile</li>
</ul>
</section>
<section>
<h2>APIs open to all - Example</h2>
<pre class="fragment"><code class="javascript" data-trim contenteditable>
const URL = "http://taco-randomizer.herokuapp.com/random/"; // TacoFancy API
fetch(URL)
.then(response=>response.json())
.then(console.log)
</code></pre>
</section>
<section>
<h2>APIs with key in URL</h2>
<ul>
<li class="fragment">Usually free!</li>
<li class="fragment">Must sign up for a developer account - may include a small questionarre explaining your project</li>
<li class="fragment">You will get an API key, which ensures API requests are coming from a legitimate source and not being abused</li>
<li class="fragment">API key is passes along as a URL parameter</li>
<li class="fragment"><i>You may be asked to provide the domain from which requests will come from - this is another security measure</i></li>
<li class="fragment">The request limit is usually NOT done by IP address - instead the number of requests per unit of time is limited (pay $$ to increase this limit)</li>
</ul>
</section>
<section>
<h2>APIs with key in URL - Example</h2>
<pre class="fragment"><code class="javascript" data-trim contenteditable>
const BASE_API = "https://api.nasa.gov/planetary/apod"; // NASA API
const API_KEY = "YOUR KEY HERE"; // get API key by signing up as a developer
const URL = BASE_API + "?api_key=" + API_KEY;
// "?api_key=" sets a URL parameter (can test this URL in browser directly!)
// parameter name is specified in the documentation
fetch(URL)
.then(response=>response.json())
.then(console.log)
</code></pre>
<p class="fragment"><a href="http://www.ronstauffer.com/blog/understanding-a-url/" target="_blank">Understanding a URL (with parameters)</a></p>
</section>
<section>
<h2>APIs with key in request header</h2>
<ul>
<li class="fragment">Usually free</li>
<li class="fragment">Must sign up for a developer account</li>
<li class="fragment">You will get an API key</li>
<li class="fragment">API key passed through request header - an object that accompanies the request</li>
<li class="fragment"><i>May have to provide the domain from which requests will come from</i></li>
<li class="fragment">Requests are limited by number per unit of time (pay $$ to increase this limit)</li>
</ul>
</section>
<section>
<h2>APIs with key in request header - Example</h2>
<pre class="fragment"><code class="javascript" data-trim contenteditable>
const URL = "https://favqs.com/api/qotd"; // Fav Quotes API
const API_KEY = "YOUR KEY HERE"; // get API key by signing up as a developer
const options = { // can have MANY more options
method:"GET", // GETting response instead of POSTing one
headers: {
"Content-Type" : "application/json", // specifying JSON as returning data type
"Authorization": "Token token=" + API_KEY // specified in documentation
}
}
fetch(URL, options) // notice 2nd parameter!
.then(response=>response.json())
.then(data=>console.log(data.quote))
</code></pre>
</section>
<section>
<h2>Reading Documentation</h2>
<p class="fragment">API Documentation is written by developers to help other developers understand how to use their API</p>
<br>
<p class="fragment"><strong>Unfortunately, there is no standard for writing documentation</strong> and you will often bump into hard-to-read, outdated, and cryptic documentation</p>
</section>
<section>
<h2>Tips for Reading Documentation</h2>
<ul>
<li class="fragment">Get a sense of how the documentation is organized</li>
<li class="fragment">Explore example code (copy & paste)</li>
<li class="fragment">Try out the first 3 methods or topics that catch your eye</li>
<li class="fragment">GOOGLE IT!</li>
</ul>
</section>
<section>
<h2>Let's Develop It!</h2>
<p>Take 2 minutes to explore the <a href="https://randomuser.me/documentation" target="_blank">Random User API Documentation</a></p>
<ul>
<li class="fragment">How would you request 100 random users?</li>
<li class="fragment">How would you request 100 female random users?</li>
<li class="fragment">How would you request a male from the US?</li>
<li class="fragment">How would you request 10 random users with only their name and cell number?</li>
</ul>
</section>
<section>
<h2>Let's Develop It! - Answer</h2>
<pre><code class="javascript" data-trim>
// 100 random users
"https://randomuser.me/api/?results=100"</code></pre>
<pre><code class="javascript" data-trim>
// 100 female random users
"https://randomuser.me/api/?results=100&gender=female"</code></pre>
<pre><code class="javascript" data-trim>
// a male from the US
"https://randomuser.me/api/?gender=male&nat=us"</code></pre>
<pre><code class="javascript" data-trim>
// 10 random users with only their name and cell number
"https://randomuser.me/api/?results=10&inc=name,cell"</code></pre>
</section>
<section>
<h2>Nested API calls</h2>
<p class="fragment">A typical pattern you'll see is when the data from one API call provides the information or setup for another API call.</p>
<pre class="fragment"><code class="javascript" data-trim contenteditable>
// Random User API
const URL_1 = "https://randomuser.me/api";
// Sunrise and Sunset times API
const URL_2_BASE = "https://api.sunrise-sunset.org/json?date=today";
fetch(URL_1)
.then(response=>response.json())
.then(userData=>{
const name = userData.results[0].name;
const full_name = `${name.first} ${name.last}`;
const coordinates = userData.results[0].location.coordinates;
const lat = coordinates.latitude;
const long = coordinates.longitude;
// Sunrise & Sunset API can accept URL parameters for longitude
// and latitude to get the sunrise and sunset for that location
const URL_2 = URL_2_BASE + "&lat=" + lat + "&lng=" + long;
fetch(URL_2)
.then(response=>response.json())
.then(ss_data=>{
const sunrise = ss_data.results.sunrise;
const sunset = ss_data.results.sunset;
console.log("My name is" + full_name);
console.log("My sunrise was at " + sunrise);
console.log("My sunset will occur at " + sunset);
})
})
</code></pre>
<p class="fragment">Notice the 2nd fetch is WITHIN the first's callback</p>
</section>
<section>
<h2>Take Home Assignment</h2>
<p>Find 1 API we didn't use and create a web application allowing users to interact with it. For example:</p>
<ul>
<li>Use the Pokemon API and allow users to search for pokemon by name</li>
<li>Use the Giphy API and allow users to find images by different criteria</li>
<li>Use the Google Maps API to send users on treasure hunts based on location</li>
</ul>
<br>
<br>
<p>The possiblities are endless!</p>
</section>
<section>
<h1>Additional Resources</h1>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/Events" target="blank">List of DOM Events</a></li>
<li>
<a href="https://javascript30.com/" target="_blank">JavaScript30</a>
</li>
<li><a href="https://scotch.io/" target="_blank">Scotch.io - tutorials</a></li>
<li><a href="https://github.com/toddmotto/public-apis" target="_blank">Public API List</a></li>
<li><a href="https://www.youtube.com/channel/UCEDkO7wshcDZ7UZo17rPkzQ" target="_blank">Mayuko - Vlog</a></li>
<li><a href="https://medium.com/@adrienne.tacke" target="_blank">Adrienne Tacke - Blog</a></li>
<li><a href="https://www.instagram.com/binarybeauty/" target="_blank">binarybeauty - Instagram</a></li>
<li><a href="https://twitter.com/MinaMarkham" target="_blank">Mina Markham - Twitter</a></li>
</ul>
</section>
<section>
<h2>So Long! Farewell!</h2>
<img src="img/farewell.gif" alt="">
</section>
<section>
<h2>Wrapping Up</h2>
<ul>
<li>Complete Surveys!</li>
</ul>
</section>
</div>
</div>
<footer>
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Intermediate JS - GDINYC
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