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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Node.js Introduction</title>
<meta name="description" content="Node.js Introduction">
<meta name="author" content="Luis Ibanez">
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<link rel="stylesheet" href="revealjs/css/reveal.min.css">
<link rel="stylesheet" href="revealjs/css/theme/sky.css" id="theme">
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<script>
document.write( '<link rel="stylesheet" href="revealjs/css/print/' + ( window.location.search.match( /print-pdf/gi ) ? 'pdf' : 'paper' ) + '.css" type="text/css" media="print">' );
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</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section>
<h1>Node.js</h1>
<h2>Introduction</h2>
<p>
<small>Created by <a href="https://opensource.com/users/luis-ibanez">Luis Ibanez</a></small>
</p>
</section>
<section>
<span xmlns:dct="http://purl.org/dc/terms/" href="http://purl.org/dc/dcmitype/InteractiveResource" property="dct:title" rel="dct:type">Node.js Introduction</span>
<br>
by
<span xmlns:cc="http://creativecommons.org/ns#" property="cc:attributionName">Luis Ibanez</span>
<br>
is licensed under a
<br>
<a rel="license" href="http://creativecommons.org/licenses/by/3.0/deed.en_US">
<img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by/3.0/88x31.png" />
</a>
<br>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/deed.en_US">Creative Commons by Attribution 4.0 License</a>
<br>
<a rel="license" href="http://www.apache.org/licenses/LICENSE-2.0">
<img alt="Apache 2.0 License" style="border-width:0" src="http://www.apache.org/images/feather-small.gif" />
</a>
<br>
<a rel="license" href="http://www.apache.org/licenses/LICENSE-2.0">Apache 2.0 License</a>
</section>
<section>
<h2>Node.js</h2>
<h3>Introduction</h3>
</section>
<section>
<a href="#" class="image">
<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Node.js_logo.svg/500px-Node.js_logo.svg.png" alt="Node.js logo">
</a>
</section>
<section>
<h2>Javascript</h2>
<h3>Server-Side</h3>
</section>
<section>
<h3>Launch</h3>
<h3>Node.js</h3>
<p>from a command line prompt</p>
</section>
<section>
<p>Simply type :</p>
<pre><code data-trim contenteditable>
nodejs
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>Your prompt will now look like:</p>
<pre><code data-trim contenteditable>
>
</code></pre>
</section>
<section>
<p>Let's try an addition:</p>
<pre><code data-trim contenteditable>
> 2+2
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>and you will get<p>
<pre><code data-trim contenteditable>
> 2+2
4
</code></pre>
</section>
<section>
<h3>Variables</h3>
</section>
<section>
<p>Let's create a variable:</p>
<pre><code data-trim contenteditable>
> var fruit='apple'
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>Let's see it's value:</p>
<pre><code data-trim contenteditable>
> fruit
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>and you will get<p>
<pre><code data-trim contenteditable>
> fruit
'apple'
</code></pre>
</section>
<section>
<p>Let's change its value:</p>
<pre><code data-trim contenteditable>
> var fruit='orange'
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>Let's see the new value:</p>
<pre><code data-trim contenteditable>
> fruit
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>and you will get<p>
<pre><code data-trim contenteditable>
> fruit
'orange'
</code></pre>
</section>
<section>
<p>"Variables"</p>
<p>are containers</p>
<p>that hold data.<p>
</section>
<section>
<p>the data in</p>
<p>"Variables"</p>
<p>can change.<p>
</section>
<section>
<p>by simply assigning</p>
<p>a new value to them</p>
</section>
<section>
<p>The value can be</p>
<p>a simple item...</p>
</section>
<section>
<p>Like a number</p>
<p>or a word</p>
</section>
<section>
<p>It can also be</p>
<p>a sentence...</p>
</section>
<section>
<p>Let's use a sentence as value:</p>
<pre><code data-trim contenteditable>
> var book='The last of the Mohicans'
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>Let's see the value:</p>
<pre><code data-trim contenteditable>
> book
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>and you will get<p>
<pre><code data-trim contenteditable>
> book
'The last of the Mohicans'
</code></pre>
</section>
<section>
<p>Variables can also</p>
<p>hold a list of items...</p>
</section>
<section>
<p>Let's make a list:</p>
<pre><code data-trim contenteditable>
> var groceries=['milk','eggs','bread']
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>Let's see the value:</p>
<pre><code data-trim contenteditable>
> groceries
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>and you will get<p>
<pre><code data-trim contenteditable>
> groceries
[ 'milk', 'eggs', 'bread' ]
</code></pre>
</section>
<section>
<p>We use the</p>
<p>square brackets [ ]</p>
<p>to define a list</p>
</section>
<section>
<p>We use the</p>
<p>comma symbol ","</p>
<p>to separate multiple items</p>
<pre><code data-trim contenteditable>
> var groceries=['milk','eggs','bread']
</code></pre>
</section>
<section>
<p>Variables can also</p>
<p>hold a list of properties...</p>
</section>
<section>
<p>Let's set some properties:</p>
<pre><code data-trim contenteditable>
> var kermit={'species':'frog','color':'green'}
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>Let's see the value:</p>
<pre><code data-trim contenteditable>
> kermit
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>and you will get<p>
<pre><code data-trim contenteditable>
> kermit
{ species: 'frog', color: 'green' }
</code></pre>
</section>
<section>
<p>We use the</p>
<p>curly brackets { }</p>
<p>to define a set of properties</p>
</section>
<section>
<p>We use the</p>
<p>colon symbol ":"</p>
<p>to separate the property key from its value</p>
<pre><code data-trim contenteditable>
var foo = { key : value }
</code></pre>
<p>(This is a generic example. Do not type it)</p>
</section>
<section>
<p>We use the</p>
<p>comma symbol ","</p>
<p>to separate multiple properties</p>
<pre><code data-trim contenteditable>
var foo = { key1 : value1, key2 : value2 }
</code></pre>
<p>(This is a generic example. Do not type it)</p>
</section>
<section>
<p>More properties</p>
<p>can be added dynamically</p>
</section>
<section>
<p>Let's add more about kermit<p>
<pre><code data-trim contenteditable>
> kermit.girlfriend = 'peggy'
</code></pre>
</section>
<section>
<p>Let's see the changes:</p>
<pre><code data-trim contenteditable>
> kermit
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>and you will get<p>
<pre><code data-trim contenteditable>
> kermit
{ species: 'frog',
color: 'green',
girlfriend: 'peggy' }
</code></pre>
</section>
<section>
<p>Let's add more about kermit<p>
<pre><code data-trim contenteditable>
> kermit.work = 'sesame street'
</code></pre>
</section>
<section>
<p>Let's see the changes:</p>
<pre><code data-trim contenteditable>
> kermit
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<a href="#" class="image">
<img src="http://upload.wikimedia.org/wikipedia/en/6/62/Kermit_the_Frog.jpg" alt="Kermit">
</a>
<p>You know a lot about me!<p>
</section>
<section>
<p>Variables can also</p>
<p>hold a hierarchy...</p>
</section>
<section>
<p>Think:Tree !</p>
<a href="#" class="image">
<img src="http://upload.wikimedia.org/wikipedia/commons/e/eb/Ash_Tree_-_geograph.org.uk_-_590710.jpg" alt="Wikipedia Tree">
</a>
</section>
<section>
<p>Think:Tree !</p>
<a href="#" class="image">
<img src="http://upload.wikimedia.org/wikipedia/commons/f/f7/Binary_tree.svg" alt="Tree Data Structure">
</a>
</section>
<section>
<h3>Time to</h3>
<h3>Travel</h3>
</section>
<section>
<p>Let's go on a trip:</p>
<pre><code data-trim contenteditable>
> var world={}
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>Let's add continents as properties:</p>
<pre><code data-trim contenteditable>
> world.africa = {}
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>Let's see the changes:</p>
<pre><code data-trim contenteditable>
> world
</code></pre>
<p>Then hit the ENTER key.<p>
</section>
<section>
<p>and you will get<p>
<pre><code data-trim contenteditable>
> world
{ africa: {} }
</code></pre>
</section>
<section>
<p>Let's add more continents as properties:</p>
<pre><code data-trim contenteditable>
> world.europe = {}
> world.asia = {}
> world.austrasia = {}
> world.antartica = {}
> world.northamerica = {}
</code></pre>
</section>
<section>
<p>Let's see the changes<p>
<pre><code data-trim contenteditable>
> world
{ europe: {},
asia: {},
austrasia: {},
antartica: {},
northamerica: {} }
</code></pre>
</section>
<section>
<p>Let's add countries as properties:</p>
<pre><code data-trim contenteditable>
> world.europe.france = {}
> world.europe.england = {}
> world.europe.germany = {}
> world.europe.italy = {}
> world.europe.poland = {}
</code></pre>
</section>
<section>
<p>Let's see the changes<p>
<pre><code data-trim contenteditable>
> world
{ europe: { france: {}, england: {}, germany: {}, italy: {}, poland: {} },
asia: {},
austrasia: {},
antartica: {},
northamerica: {} }
</code></pre>
</section>
<section>
<p>We can also inspect a specific branch<p>
<pre><code data-trim contenteditable>
> world.europe
{ france: {}, england: {}, germany: {}, italy: {}, poland: {} }
</code></pre>
</section>
<section>
<h3>Your</h3>
<h3>Turn !</h3>
</section>
<section>
<p>Pick a</p>
<p>Continent</p>
</section>
<section>
<p>Add three</p>
<p>countries</p>
<p>to it</p>
</section>
<section>
<p>Pick a</p>
<p>Country</p>
</section>
<section>
<p>Add three</p>
<p>cities</p>
<p>to it</p>
</section>
<section>
<p>Pick a</p>
<p>City</p>
</section>
<section>
<p>Add a list of three food items</p>
<p>that you would like to eat there</p>
</section>
<section>
<p>Inspect the variable</p>
<p>at the level of the city</p>
</section>
<section>
<p>It should look like<p>
<pre><code data-trim contenteditable>
> world.southamerica.brazil
{ saopaulo: {},
riodejaneiro: { food: [ 'rodizio', 'mango', 'shrimp' ] },
salvador: {} }
</code></pre>
</section>
<section>
<p>Let's exit</p>
<p>nodejs</p>
</section>
<section>
<p>type<p>
<pre><code data-trim contenteditable>
process.exit();
</code></pre>
</section>
<section>
<p>Now you should be back</p>
<p>at the '$' prompt</p>
<p>in the command line</p>
</section>
<section>
<h3>Breath!</h3>
</section>
<section>
<h3>Smile!</h3>
</section>
</div>
</div>
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