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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Class 2 ~ JavaScript for Beginners ~ Girl Develop It</title>
<meta name="description" content="This is an introduction to JavaScript curriculum, developed by Sylvia Richardson for the Raleigh/Durham chapter.
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.">
<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="reveal/css/reveal.css">
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<link rel="stylesheet" href="css/custom.css">
<!-- For syntax highlighting -->
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<!-- If use the PDF print sheet so students can print slides-->
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<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<!-- 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" alt="GDI logo">
<h3>JavaScript for Beginners</h3>
<h4>Class 2</h4>
</section>
<section>
<h3>Review</h3>
<p>In this code, spot the comments, variables, operator, function, argument, and return value.</p>
<pre><code>
function calculateTip(total) {
var tipPercent = 0.15; //Can be changed
return (total * tipPercent);
}
var billPreTip = 10;
var billTip = calculateTip(billPreTip);
var receipt = 'Meal: ' + billPreTip + ' Tip: ' + billTip +
' Total: ' + (billPreTip + billTip);
console.log(receipt);
</code></pre>
</section>
<section>
<h3>Variable Scope</h3>
<p>The scope of a variable is how long the computer will remember it.</p>
</section>
<section>
<h3>Global Scope</h3>
<p>A variable declared outside a function has a <span class="yellow">global</span> scope and can be accessed anywhere, even in a function.</p>
<pre><code>
var awesomeGroup = 'Girl Develop It'; //Global scope
function whatIsAwesome() {
console.log (awesomeGroup + ' is pretty awesome.'); //Will work
}
whatIsAwesome();
</code></pre>
</section>
<section>
<h3>Local Scope</h3>
<p>A variable declared within a function has a <span class="yellow">local</span> scope and can only be accessed within that function.</p>
<pre><code>
function whatIsAwesome() {
var awesomeGroup = 'Girl Develop It'; //Local scope
console.log ('I made a variable called awesomeGroup with a value of ' + awesomeGroup); //Will work
}
whatIsAwesome();
console.log (awesomeGroup + ' is pretty awesome.'); //Won't work
</code></pre>
</section>
<section>
<h3>Boolean Variables</h3>
<p>Boolean variables represent the logical values True and False</p>
<pre><code>
var catsAreBest = true;
var dogsRule = false;
</code></pre>
<p>If you try to use another variable as a boolean, JavaScript will guess. The number 0, the empty string '', undefined, and null are considered false, everything else reads as true.</p>
</section>
<section>
<h3>The if statement</h3>
<p>Use if to decide which lines of code to execute, based on a condition.</p>
<pre><code>
if (condition) {
// statements to execute
}
</code></pre>
<pre><code>
var bananas = 5;
if (bananas > 0) {
console.log ('You have some bananas!');
}
</code></pre>
</section>
<section>
<h3>Comparison Operators</h3>
<table class="smalltext">
<thead>
<tr>
<th width="150px">Example</th>
<th width="250px">Name</th>
<th>Result</th>
</tr>
</thead>
<tbody>
<tr>
<td>a == b</td>
<td>Equal</td>
<td><strong><code>TRUE</code></strong> if a is equal to b (can be different types).</td>
</tr>
<tr>
<td>a === b</td>
<td>Identical</td>
<td>
<strong><code>TRUE</code></strong> if a is equal to b, and the same type. </td>
</tr>
<tr>
<td>a != b</td>
<td>Not equal</td>
<td><strong><code>TRUE</code></strong> if a is not equal to b (can be different types).</td>
</tr>
<tr>
<td>a !== b</td>
<td>Not identical</td>
<td>
<strong><code>TRUE</code></strong> if a is not equal to b, or they are not the same type.</td>
</tr>
<tr>
<td>a < b</td>
<td>Less than</td>
<td><strong><code>TRUE</code></strong> if a is strictly less than b.</td>
</tr>
<tr>
<td>a > b</td>
<td>Greater than</td>
<td><strong><code>TRUE</code></strong> if a is strictly greater than b.</td>
</tr>
<tr>
<td>a <= b</td>
<td>Less than or equal to </td>
<td><strong><code>TRUE</code></strong> if a is less than or equal to b.</td>
</tr>
<tr>
<td>a >= b</td>
<td>Greater than or equal to </td>
<td><strong><code>TRUE</code></strong> if a is greater than or equal to b.</td>
</tr>
</tbody>
</table>
</section>
<section>
<h3>Watch out!</h3>
<p>Don't mix up = and ==</p>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Make a variable called "temperature." Write some code that tells you to put on a coat if it is below 50 degrees.</p>
</section>
<section>
<h3>The if/else statement</h3>
<p>Use else to provide an alternate set of instructions.</p>
<pre><code>
var age = 28;
if (age >= 16) {
console.log ('Yay, you can drive!');
} else {
console.log ('Sorry, but you have ' + (16 - age) +
' years until you can drive.');
}
</code></pre>
</section>
<section>
<h3>The if/else if/else statement</h3>
<p>If you have multiple conditions, you can use else if.</p>
<pre><code>
var age = 20;
if (age >= 35) {
console.log('You can vote AND hold any place in government!');
} else if (age >= 25) {
console.log('You can vote AND run for the Senate!');
} else if (age >= 18) {
console.log('You can vote!');
} else {
console.log('You can\'t vote, but you can
still write your representatives.');
}
</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Modify your "wear a coat" code for these conditions:</p>
<ol>
<li>If it is less than 50 degrees, wear a coat.</li>
<li>If it is less than 30 degrees, wear a coat and a hat.</li>
<li>If it is less than 0 degrees, stay inside.</li>
<li>Otherwise, wear whatever you want.</li>
</ol>
</section>
<section>
<h3>Logical Operators</h3>
<table>
<thead>
<tr>
<th width="200px">Example</th>
<th width="150px">Name</th>
<th>Result</th>
</tr>
</thead>
<tbody>
<tr>
<td>a && b</td>
<td>And</td>
<td><strong><code>TRUE</code></strong> if both a and b are <strong><code>TRUE</code></strong>.</td>
</tr>
<tr>
<td>a || b</td>
<td>Or</td>
<td><strong><code>TRUE</code></strong> if either a or b is <strong><code>TRUE</code></strong>.</td>
</tr>
<tr>
<td>! a</td>
<td>Not</td>
<td><strong><code>TRUE</code></strong> if a is not <strong><code>TRUE</code></strong>.</td>
</tr>
</tbody>
</table>
</section>
<section>
<h3>Using logical operators</h3>
<p>You can use these operators to combine conditions.</p>
<pre><code>
var bananas = 5;
if (bananas >=2 && bananas <7) {
console.log ('You have a reasonable number of bananas');
} else {
console.log ('Check your banana supply');
}
</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Add a logical operator to your what to wear program.</p>
</section>
<section>
<h3>While loops</h3>
<p>While will repeat the same code over and over until some condition is met.</p>
<pre><code>
var bottlesOfBeer = 99;
while (bottlesOfBeer >= 1) {
console.log (bottlesOfBeer + ' bottles of beer on the wall');
bottlesOfBeer = bottlesOfBeer - 9;
}
</code></pre>
</section>
<section>
<h3>Infinite Loops</h3>
<p>Make sure something changes in the loop, or your loop will go on forever...</p>
</section>
<section>
<h3>For loops</h3>
<p>For loops are very similar, but you declare a counter in the statement.</p>
<pre><code>
//will count 1 to 10
for (var i = 1; i <= 10; i++) {
console.log (i);
}
</code></pre>
</section>
<section>
<h3>Loops and logic</h3>
<p>You can add other statements or logical operators inside the loops.</p>
<pre><code>
//Count from 1 to 50
for (var i = 1; i <= 50; i++) {
console.log (i);
//Says 'Buzz' after multiples of three
if (i % 3 == 0) {
console.log (' Buzz');
}
//Says 'Bang' after multiples of five
if (i % 5 == 0) {
console.log (' Bang');
}
}
</code></pre>
</section>
<section>
<h3>Break</h3>
<p>To exit a loop, use the break statement.</p>
<pre><code>
//Count from 100 to 200
for (var i = 100; i <= 200; i++) {
console.log('Testing ' + i);
//Stop at the first multiple of 7
if (i % 7 == 0) {
console.log('Found it! ' + i);
break;
}
}
</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Write a loop that gives you the 9's times table,<br /> from 9 x 1 = 9 to 9 x 12 = 108.</p>
<p>Finish early? Try using a loop inside a loop to write all the times tables, from 1 to 12.</p>
</section>
<section>
<h3>Arrays</h3>
<p>Arrays are ordered lists of values.</p>
<pre><code>
var arrayName = [element0, element1, ...];
</code></pre>
<p>You can put different types of data into an array.</p>
<pre><code>
var rainbowColors = ['Red', 'Orange', 'Yellow', 'Green',
'Blue', 'Indigo', 'Violet'];
var lotteryNumbers = [33, 72, 64, 18, 17, 85];
var myFavoriteThings = ['Broccoli', 1024, 'Sherlock'];
</code></pre>
</section>
<section>
<h3>Array Length</h3>
<p>The length property tells you how many things are in an array</p>
<pre><code>
var rainbowColors = ['Red', 'Orange', 'Yellow', 'Green',
'Blue', 'Indigo', 'Violet'];
console.log(rainbowColors.length);
</code></pre>
</section>
<section>
<h3>Using Arrays</h3>
<p>You can access items with "bracket notation" by using the position of the object you want. Programmers start counting at zero.</p>
<pre><code>
var rainbowColors = ['Red', 'Orange', 'Yellow', 'Green',
'Blue', 'Indigo', 'Violet'];
var firstColor = rainbowColors[0];
var lastColor = rainbowColors[6];
</code></pre>
</section>
<section>
<h3>Changing arrays</h3>
<p>You can use bracket notation to change an item in an array</p>
<pre><code>
var myFavoriteThings = ['Broccoli', 1024, 'Sherlock'];
myFavoriteThings[0] = 'Asparagus';
</code></pre>
</section>
<section>
<h3>Expanding arrays</h3>
<p>Arrays do not have a fixed length. You can use "push" to add something to an array.</p>
<pre><code>
var myFavoriteThings = ['Broccoli', 1024, 'Sherlock'];
myFavoriteThings.push('Dancing');
</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Create an array of your favorite foods. Echo a few values onto your screen.</p>
</section>
<section>
<h3>Iterating through arrays</h3>
<p>Use a for loop to easily process each item in an array.</p>
<pre><code>
var rainbowColors = ['Red', 'Orange', 'Yellow', 'Green', 'Blue', 'Indigo', 'Violet'];
for (var i = 0; i < rainbowColors.length; i++) {
console.log(rainbowColors[i]);
}
</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Use a loop to make a list of all your favorite foods.</p>
</section>
<section>
<h3>Resources</h3>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide" target="_blank">JavaScript Guide</a>, from the Mozilla Developers Network.</li>
<li><a href="http://www.codecademy.com/tracks/javascript" target="_blank">Code Academy</a>, with interactive JavaScript lessons to help you review.</li>
</ul>
</section>
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JavaScript for Beginners ~ Girl Develop It ~
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