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		<title>Class 2 ~ Javascript ~ Girl Develop IT</title>

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    The course is meant to be taught in 4 two-hour sections. Each of the slides and practice files are customizable according to the needs of a given class or audience.">
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			<!-- Any section element inside of this container is displayed as a slide -->
			<div class="slides">
			  <!-- Opening slide -->
        <section>
          <img src = "images/gdi_logo_badge.png">
          <h3>Beginning Javascript</h3>
          <h4>Class 2</h4>
        </section>
        
        <!-- Welcome-->
        <section>
          <h3>Welcome!</h3>
          <div class = "left-align">
          <p>Girl Develop It is here to provide affordable and accessible programs to learn software through mentorship and hands-on instruction.</p>
          <p class ="green">Some "rules"</p>
          <ul>
            <li>We are here for you!</li>
            <li>Every question is important</li>
            <li>Help each other</li>
            <li>Have fun</li>
          </ul>
          </div>
        </section>
        
        <!-- Loops-->
        <section>
          <h3>Loops</h3>
          <p>Sometimes you want to go through a piece of code multiple times</p>
          <p class = "fragment">Why?</p>
          <ul>
            <li class = "fragment">Showing a timer count down</li>
            <li class = "fragment">Displaying the results of a search</li>
            <li class = "fragment">Adding images to a slideshow</li>
          </ul>
        </section>
        
         <section>
          <h3>The while loop</h3>
          <p>The while loop tells JS to repeat statements while a condition is true:</p>
          <pre><code contenteditable class = "javascript">
      while (expression) {
        // statements to repeat
      }
          </code></pre>
          <pre><code contenteditable class = "javascript">
      var x = 0;
      while (x < 5) {
        console.log(x);
        x++;
      }
          </code></pre>
          <div class = "fragment">
            Review: '++' means increment by 1!
          </div>
          <div class = "fragment">
            <div class = "yellow">Danger!!</div>
            <p>What happens if we forget x++;?</p>
            <p>The loop will never end!!</p>
          </div>
        </section>
        
        <section>
          <h3>The for loop</h3>
          <p>The for loop is a safer way of looping</p>
          <pre><code contenteditable class = "javascript">
          for (initialize; condition; update) {
            // statements to repeat
          }
          </code></pre>
          <pre><code contenteditable class = "javascript">
          for (var i = 0; i < 5; i++) {
            console.log(i);
          }
          </code></pre>
          <div class = "fragment">
            Less danger of an infinite loop. All conditions are at the top!
          </div>
        </section>
          
        <!-- Arrays -->
        <section>
          <h3>Array</h3>
          <p>An array is a data-type that holds an ordered list of values, of any type:</p>
          <div class = "fragment">
            <pre><code contenteditable class = "javascript">
          var arrayName = [element0, element1, ...];
            </code></pre>
          </div>
          <div class = "fragment">
            <pre><code contenteditable class = "javascript">
var rainbowColors = ['Red', 'Orange', 'Yellow', 'Green', 'Blue', 'Indigo', 'Violet'];
var favoriteNumbers = [16, 27, 88];
var luckyThings = ['Rainbows', 7, 'Horseshoes'];
            </code></pre>
          </div>
          <div class = "fragment">
            The length property reports the size of the array:
            <pre><code contenteditable class = "javascript">
          console.log(rainbowColors.length);
            </code></pre>
          </div>
        </section>
        
        <section>
          <h3>Arrays -- returning values</h3>
          <p class = "fragment">You can access items with "bracket notation".</p> 
          <div class = "fragment">
            The number inside the brackets is called an "index"
            <pre><code contenteditable class = "javascript">
          var arrayItem = arrayName[indexNum];
            </code></pre>
          </div>
          <div class = "fragment">
            Arrays in JavaScript are "zero-indexed", which means we start counting from zero.
            <pre><code contenteditable class = "javascript">
      var rainbowColors = ['Red', 'Orange', 'Yellow', 'Green', 'Blue', 'Indigo', 'Violet'];
      var firstColor = rainbowColors[0];
      var lastColor = rainbowColors[6];
            </code></pre>
          </div>
        </section>
        
        <section>
          <h3>Arrays -- updating values</h3>
          <div class = "fragment">
          You can also use bracket notation to change the item in an array:
            <pre><code contenteditable class = "javascript">
        var awesomeAnimals = ['Corgis', 'Otters', 'Octopi'];
        awesomeAnimals[0] = 'Bunnies';
            </code></pre>
          </div>
          <div class = "fragment">
          Or to add to an array:
            <pre><code contenteditable class = "javascript">
          awesomeAnimals[4] = 'Corgis';
            </code></pre>
          </div>
          
          <div class = "fragment">
         You can also use the push method:
            <pre><code contenteditable class = "javascript">
          awesomeAnimals.push('Ocelots');
            </code></pre>
          </div>
        </section>
        
        <section>
          <h3>Loops and Arrays</h3>
          Use a for loop to easily look at each item in an array:
          <pre><code contenteditable class = "javascript">
var rainbowColors = ['Red', 'Orange', 'Yellow', 'Green', 'Blue', 'Indigo', 'Violet'];
for (var i = 0; i < rainbowColors.length; i++) {
  console.log(rainbowColors[i]);
}
          </code></pre>
        </section>
        
        <!-- Exercise -->
        <section>
          <h3>Let's Develop It</h3>
          <ul>
            <li>Add a new link to the exercise from last week</li>
            <li>Add an onclick to the link for a function called favoriteThings()</li>
            <li>Create a new function called favoriteThings() in the javascript file</li>
            <li>In the function, create an array and loop through the results</li>
            <li>Post the results in an alert "My favorite things are XX, YY, ZZ'</li>
            <li>Bonus -- add an 'and' in the sentence before the last item</li>
          </ul>
        </section>
        
        <!-- Objects-->
        <section>
          <h3>Objects</h3>
          <p>Objects are a data type that let us store a collection of properties and methods.</p>
          <pre><code contenteditable class = "javascript">
          var objectName = { 
            propertyName: propertyValue,
            propertyName: propertyValue,
            ...
          };
          </code></pre>
          <div class = "fragment">
            <pre><code contenteditable class = "javascript">
      var charlie = {
        age: 8,
        name: "Charlie Brown",
        likes: ["baseball", "The little red-haired girl"],
        pet: "Snoopy"
      };
          </code></pre>
          </div>
        </section>
        
        <section>
          <h3>Objects -- returning values</h3>
          <p>Access values of "properties" using "dot notation":</p>
          <div class = "fragment">
            <pre><code contenteditable class = "javascript">
      var charlie = {
        age: 8,
        name: "Charlie Brown",
        likes: ["baseball", "The little red-haired girl"],
        pet: "Snoopy"
      };
      </code></pre>
          </div> 
          <div class = "fragment">
            <pre><code contenteditable class = "javascript">
          var pet = charlie.pet;
            </code></pre>
          </div>
        </section>
        
        <section>
          <h3>Objects -- returning values</h3>
          <div class = "fragment">
            Or using "bracket notation" (like arrays):
            <pre><code contenteditable class = "javascript">
          var name = charlie['name'];
            </code></pre>
          </div>
          <div class = "fragment">
            Non-existent properties will return undefined:
            <pre><code contenteditable class = "javascript">
          var gender = charlie.gender
            </code></pre>
          </div>
        </section>
        
        <section>
          <h3>Objects -- changing values</h3>
          <p>Use dot or bracket notation with the assignment operator to change objects.</p>
          <div class = "fragment">
          Change existing properties:
          <pre><code contenteditable class = "javascript">
          charlie.name = "Chuck";
          </code></pre>
          </div>
          <div class = "fragment">
            Or add new properties:
            <pre><code contenteditable class = "javascript">
          charlie.gender = "male";
            </code></pre>
          </div>
          <div class ="fragment">
          You can also delete properties:
          <pre><code contenteditable class = "javascript">
          delete charlie.gender;
          </code></pre>
          </div>
        </section>
        
        <section>
          <h3>Arrays of Objects</h3>
          <p>Arrays can hold objects too!</p>
          <div class = "fragment">
            <pre><code contenteditable class = "javascript">
          var peanuts = [
            {name: "Charlie Brown", 
             pet: "Snoopy"},
            {name: "Linus van Pelt",
             pet: "Blue Blanket"}
          ];
            </code></pre>
          </div>
          <div class = "fragment">
            That means we can use a for loop!
            <pre><code contenteditable class = "javascript">
  for (var i = 0; i < peanuts.length; i++) {
    var peanut = peanuts[i];
    console.log(peanut.name + ' has a pet named ' + peanut.pet + '.');
  }
          </code></pre>
          </div>
        </section>
        
        <section>
          <h3>Objects in functions</h3>
          <p>You can pass an object into a function as a parameter</p>
          <pre><code contenteditable class = "javascript">
        var peanut ={
          name: "Charlie Brown", 
          pet: "Snoopy"
          };
          </code></pre>
          <div class = "fragment">
            <pre><code contenteditable class = "javascript">
  function describeCharacter(character){
    console.log(character.name + ' has a pet named ' + character.pet + '.');
  }
            </code></pre>
          </div>
         <div class = "fragment">
            <pre><code contenteditable class = "javascript">
              describeCharacter(peanut);
            </code></pre>
          </div>
        </section>
        
        <!-- Exercise -->
        <section>
          <h3>Let's Develop It</h3>
          <ul>
            <li>Add another link that calls the function myFriends() onclick</li>
            <li>Add a new function to the javascript myFriends</li>
            <li>In the function, create an array of friends objects, with their names and hair colors</li>
            <li>Use a for loop to go through each friend and describe them</li>
            <li>Alert the results</li>
            <li>Bonus -- make a separate functions that describe the friends</li>
          </ul>
        </section>
        
        <!-- DOM -->
        <section>
          <h3>DOM</h3>
          <ul>
            <li class = "fragment">"Document Object Model"</li>
            <li class = "fragment">A way to interact with the HTML elements on a webpage</li>
            <li class = "fragment">Chrome and Firefox -- Right click --> Inspect Element</li>
          </ul>
          <img src = "images/dom.png" class = "fragment">
        </section>
        
        <section>
          <h3>DOM Interaction</h3>
          <p class = "fragment">On every webpage, the document object gives us ways of accessing and changing the DOM.</p>
          <p class = "fragment left-align">Every DOM "node" has properties. They are connected like a family tree.</p>   
          <p class = "fragment left-align"> Parent (parentNode), children (childNodes, firstChild), siblings (prevSibling, nextSibling)</p> 
          <div class = "fragment">
            <pre><code contenteditable class = "javascript">
  var bodyNode = document.body; // &lt;body>
  var htmlNode = document.body.parentNode; // &lt;html>
  for (var i = 0; i < document.body.childNodes.length; i++) {
    var childNode = document.body.childNodes[i];
    //could be &lt;p>, &lt;h1>, etc.
    //any html element
  }
          </code></pre>
          </div>
        </section>
        
        <section>
          <h3>DOM Interaction: Easier</h3>
          <p class = "fragment blue">Finding every element on the page by siblings and children is time consuming!</p>
          <p class = "fragment">The document object also provides methods for finding DOM nodes without going one by one</p>
          <div class = "fragment">
            Find element by id
            <pre><code contenteditable class = "html">
&lt;img id="mainpicture" src="http://girldevelopit.com/assets/pink-logo.png">
            </code></pre>
            <pre><code contenteditable class = "javascript">
var img = document.getElementById('mainpicture');            
            </code></pre>
          </div>
        </section>
        
        <section>
          <h3>DOM Interaction: Easier</h3>
          <div class = "fragment">
            Find element by tag name (p, li, div, etc.)
            <pre><code contenteditable class = "html">
          &lt;li class="peanut">Charlie Brown&lt;/li>
          &lt;li class="peanut">Linus van Pelt&lt;/li>
            </code></pre>
          <pre><code contenteditable class = "javascript">
      var listItems = document.getElementsByTagName('li');
      for (var i =0; i < listItems.length; i++) {
        var listItem = listItems[i];
      }
          </code></pre>
          </div>
        </section>
        
        <!-- Methods-->
        <section>
          <h3>Methods</h3>
          <ul>
            <li class = "fragment">Methods are functions that are associated with an object</li>
            <li class = "fragment">The affect or return a value for a specific object</li>
            <li class = "fragment">Used with dot notation</li>
          </ul>
          <div class = "fragment">
            Previously seen example:
            <pre><code contenteditable class = "javascript">
            var img = document.getElementById('mainpicture');
            </code></pre>
          </div>
        </section>
        
        <!-- Attributes-->
        <section>
          <h3>DOM Nodes -- Attributes</h3>
          <p>We can use node methods to set and retrieve attributes</p>
          <div class = "fragment">
            getAttribute/setAttribute
            <pre><code contenteditable class = "javascript">
 var img = document.getElementById('mainpicture');
 img.getAttribute('src');
 img.setAttribute('src', 'http://girldevelopit.com/assets/pink-logo.png');
            </code></pre>
            
            <pre><code contenteditable class = "javascript">
 var img = document.getElementById('mainpicture');
 img.getAttribute('class');
 img.setAttribute('class', 'picture-class');
            </code></pre>
          </div>
        </section>
        
        <!-- Inner HTML-->
        <section>
          <h3>DOM innerHTML</h3>
          <p>Each DOM node has an innerHTML property:</p>
        <div class = "fragment">
          <pre><code contenteditable class = "javascript">
        document.body.innerHTML;
          </code></pre>
        </div>
        <div class = "fragment">
        You can set innerHTML yourself to change the contents of the node:
          <pre><code contenteditable class = "javascript">
document.body.innerHTML = '&lt;p>I changed the whole page!&lt;/p>';
          </code></pre>
        </div>
        <div class = "fragment">
        You can also just add to the innerHTML instead of replace everything:
          <pre><code contenteditable class = "javascript">
document.body.innerHTML += "...just adding this bit at the end of the page.";
          </code></pre>
        </div>
        </section>
        
        <!-- Create element and append child-->
        <section>
          <h3>DOM Modifying</h3>
          <p>The document object can create new nodes:</p>
          <div class = "fragment">
            <pre><code contenteditable class = "javascript">
              document.createElement(tagName);
              document.createTextNode(text);
              document.appendChild();
            </code></pre>
          </div>
          <div class = "fragment">
            <pre><code contenteditable class = "javascript">
var newImg = document.createElement('img');
newImg.src = 'http://girldevelopit.com/assets/pink-logo.png';
document.body.appendChild(newImg);
            </code></pre>
          </div>
          <div class = "fragment">
            <pre><code contenteditable class = "javascript">
var newParagraph = document.createElement('p');
var paragraphText = document.createTextNode('New Paragraph!');
newParagraph.appendChild(paragraphText);
document.body.appendChild(newParagraph);
      </code></pre>
          </div>
          
        </section>
        
        <!-- Exercise-->
        <section>
          <h3>Let's Develop It</h3>
          <ul>
            <li>Put it all together</li>
            <li>Modify your existing three functions to add new elements to the screen instead of fire an alert</li>
            <li>Keep in mind how to find an element, how to append an element, and how to change the inner html of an element</li>
            <li>There are lots of possible solutions! Be creative!</li>
          </ul>
        </section>
        <!-- -->
        <section>
          <h2>Questions?</h2>
          <div style = "font-size:1200%; height:100%; margin-top:40%" class ="blue">?
            <div class ="clear"></div></div>
        </section>
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