NodeJS-Introduction-Part-II/index.html at master · UniversityatAlbany-LearningEncounters/NodeJS-Introduction-Part-II · GitHub

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<!doctype html>
<html lang="en">

  <head>
    <meta charset="utf-8">

    <title>Node.js Functions</title>

    <meta name="description" content="Node.js Functions">
    <meta name="author" content="Luis Ibanez">

    <meta name="apple-mobile-web-app-capable" content="yes" />
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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>Functions</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 Functions</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>
          <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>
          <h2>Node.js</h2>
          <h3>Functions</h3>
        </section>

        <section>
          <h3>Let's write</h3>
          <h3>our first</h3>
          <h3>Function</h3>
        </section>

        <section>
          <p>Launch Vim from the command line prompt</p>
          <p>to create a new file</p>
          <pre><code data-trim contenteditable>
vim helloworld.js
          </code></pre>
        </section>

        <section>
          <p>Type in the file the following</p>
          <pre><code data-trim contenteditable>
var sayhello = function() {
  console.log("Hello World");
}

sayhello();
          </code></pre>
          <p>Save the file and quit the editor</p>
        </section>

        <section>
          <p>Run the code with nodejs</p>
          <pre><code data-trim contenteditable>
nodejs helloworld.js
          </code></pre>
        </section>

        <section>
          <p>You should see</p>
          <pre><code data-trim contenteditable>
"Hello World"
          </code></pre>
        </section>

        <section>
          <h3>Let's write</h3>
          <h3>our second</h3>
          <h3>Function</h3>
        </section>

        <section>
          <p>Launch Vim from the command line prompt</p>
          <p>to create a new file</p>
          <pre><code data-trim contenteditable>
vim visitcountries.js
          </code></pre>
        </section>

        <section>
          <p>Type in the file the following</p>
          <pre><code data-trim contenteditable>
var visitcountries = function() {
  var world = {};
  world.asia = {};
  world.africa = {};
  world.america = {};
  world.asia.japan = {};
  world.asia.japan.tokyo = {};
  world.asia.japan.kyoto = {};

  console.log("Visited %j",world);
}

visitcountries();
          </code></pre>
        </section>

        <section>
          <p>Run the code with nodejs</p>
          <pre><code data-trim contenteditable>
nodejs visitcountries.js
          </code></pre>
        </section>

        <section>
          <p>You should see</p>
          <pre><code data-trim contenteditable>
Visited {"asia":{"japan":{"tokyo":{},"kyoto":{}}},"africa":{},"america":{}}
          </code></pre>
        </section>

        <section>
          <h3>Let's improve</h3>
          <h3>the formatting</h3>
        </section>

        <section>
          <p>Edit the file</p>
          <pre><code data-trim contenteditable>
vim visitcountries.js
          </code></pre>
        </section>

        <section>
          <p>Replace the line:</p>
          <pre><code data-trim contenteditable>
  console.log("Visited %j",world);
          </code></pre>
          <p>With the line:</p>
          <pre><code data-trim contenteditable>
  console.log( JSON.stringify(world,null,2) );
          </code></pre>
        </section>

        <section>
          <p>Run the code again</p>
          <pre><code data-trim contenteditable>
nodejs visitcountries.js
          </code></pre>
        </section>

        <section>
          <h3>Let's get data</h3>
          <h3>from the Web</h3>
        </section>

        <section>
          <p>Create a new file</p>
          <pre><code data-trim contenteditable>
vim weatherdata.js
          </code></pre>
        </section>

        <section>
          <p>Type in the file the following</p>
          <pre><code data-trim contenteditable>
var http = require('http');

var options = {
  host: 'api.openweathermap.org',
  path: '/data/2.5/weather?q=Albany,US'
};

callback = function(response) {

  response.on('data', function (inputdata) {
    var jsonstr = JSON.parse(inputdata);
    console.log(JSON.stringify(jsonstr,null,2));
  });

}

http.request(options, callback).end();
          </code></pre>
        </section>

        <section>
          <p>Save the file</p>
          <p>and quit the editor</p>
        </section>

        <section>
          <p>Run the new code</p>
          <pre><code data-trim contenteditable>
nodejs weatherdata.js
          </code></pre>
        </section>

        <section>
          <p>Analyze</p>
          <p>the output</p>
        </section>

        <section>
          <h3>Let's get data</h3>
          <h3>for any city</h3>
        </section>

        <section>
          <p>Edit the file</p>
          <pre><code data-trim contenteditable>
vim weatherdata.js
          </code></pre>
        </section>

        <section>
          <p>Edit the first lines to become:</p>
          <pre><code data-trim contenteditable>
var http = require('http');

var city    = process.argv[2];
var country = process.argv[3];

var options = {
  host: 'api.openweathermap.org',
  path: '/data/2.5/weather?q=' + city + ',' + country
};
          </code></pre>
        </section>

        <section>
          <p>Run the code again</p>
          <p>but this time add the arguments</p>
          <pre><code data-trim contenteditable>
nodejs weatherdata.js Albany US
          </code></pre>
        </section>

        <section>
          <h3>Let's get</h3>
          <h3>more data!</h3>
        </section>

        <section>
          <h3>Find out</h3>
          <h3>the weather</h3>
          <h3>from three cities</h3>
        </section>

        <section>
          <h3>Breath!</h3>
        </section>

        <section>
          <h3>Smile!</h3>
        </section>


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