website/javascript.html at master · hillarysanders/website · GitHub

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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <title>
            Hillary Sanders
        </title>
        <meta name="author" content="Hillary Sanders">
        <meta name="keywords" content="Hillary Sanders Statistics Berkeley Premise Data Scientist Art Bayesian Painting">
        <meta name="description" content="Hillary Sanders: Data Scientist?">
        <meta name="robots" content="index, follow, noarchive">

      <link type="text/css" rel="stylesheet" href="css/reset.css"/>
      <link type="text/css" rel="stylesheet" href="css/mainstylesheet.css"/>
      <style>
         .midwrap {
            min-height: 1800px;
         }
         .light {
            min-height: 1525px;
         }
      </style>
   </head>

   <body>

      <div class="midwrap">
         <div class="header codex basic"><h1>hillary sanders</h1></div>

         <div class="navbox">
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               <a href="index.html"><li class="navitem basic">about hillz</li></a>
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            <!-- Main content -->
        <!-- Main content -->
        <div class="onecol">
          <h2><b>Javascript</b></h2>
        </div>
         <div class="midwrap light">


         <div class="threecol thick">
          <h2> <b>Data Structures</b> </h2>
          <h3>Numbers</h3>
          - Includes integers, <code>+infinity</code> and <code>-infinity</code>, and <code>NaN</code> (not a number)<br>
          - Numbers can be a bit weird in javascript because not a lot of digits are stored in memory.
          While<br> <code> 0.1 + 0.2 == 0.30000000000000004 </code> returns <code> true, <br> </code>
          <code>0.1 + 0.2 == 0.3000000000000004</code> (one less zero) returns <code>false</code>.
          <br> <br>
          There's a built-in object called <code>Math</code> that helps out with a few mathematical functions and constants.
          <br>
          <code>Math.sin(0)</code><comment> // 0</comment><br>
          <code>Math.round(Math.exp(2))</code> <comment> // 7 </comment><br>
          <code>Math.pi</code> <comment> // 3.141592653589793 </comment><br>
          <br>
          There are built in functions that can, for example, convert characters to integers (the 10 = the base).<br>
          <code>parseInt("123", 10)</code> <comment> // 123</comment><br>
          <code>parseInt("ummm")</code> <comment> // NaN </comment><br>
          <code>+"10"</code> <comment> // 10</comment><br>

          <h3>Strings</h3>
          substr(begin, length)<br>
          <code> 'hello world!'.substr(6, 5) </code> <comment> // "world" </comment><br>
          <code> "hello".charAt(0)</code> <comment> // "h" </comment><br>
          <code> "Eww, ice cream".replace("Eww,", "I like") </code> <comment> // "I like ice cream"</comment><br>
          <code> "hello".toUpperCase()</code> <comment> // "HELLO"</comment><br>
          <code> "ice" + " " + "cream"</code> <comment> // "ice cream"</comment><br>
          Note that when coercing numbers to characters, order matters. If the numbers come first, they'll be
          added together before being coerced to characters.
          <code>"1" + 2 + 3 </code> <comment> // "123" </comment><br>
          <code> 2 + 3 + "1" </code> <comment> // "51"</comment><br>


          <h3>Booleans</h3>
          <code>false</code>: <code>false</code>, <code>0</code>, the empty string <code>""</code>, <code>NaN</code>, <code>null</code>, and <code>undefined</code> all become false.
          <br>
          <code>true</code>: everything else. <br>

          <h4>Comparisons:</h4>
          <code><</code>, <code>></code>, <code><=</code>, <code>>=</code>, <code>==</code>, <code>===</code>, <code>!=</code>

          <code>1==true</code> <comment> // True</comment><br>
          <code>1===true </code> <comment> // False</comment><br>
          <code>1===1</code> <comment> // True</comment><br>


          <h3>Undefined</h3>
          An unititialized value. If you declare a variable without assigning a value to it, it will be <code>Undefined</code>.


          <h3>Null</h3>
          A deliberate non-value.


          <h3>Objects</h3>
          &nbsp;&nbsp;&nbsp;<li> <h3> Functions</h3></li>
          &nbsp;&nbsp;&nbsp;<li> <h3> Arrays</h3></li>
          &nbsp;&nbsp;&nbsp;<li> <h3> Dates</h3></li>
          &nbsp;&nbsp;&nbsp;<li> <h3> Regular Expressions</h3></li>


          <code> </code> <comment> // </comment><br>


          <code> var a = 4</code> <comment> </comment><br>


         </div>

         <div class="threecol thick">

         </div>

         <div class="threecol thick" id="js">
          <center>
            <input type="text" id="typey_box"/>
            <button onclick="do_things()">Click</button>
            <div id="output">Results will appear here.</div>

          </center>

         </div>


        </div>
      </div>
</body>

<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<script>


 function do_things()
{
    var text_box = document.getElementById('typey_box');
    var results_box = document.getElementById('output');
    var text = text_box.value;
    var message = 1+2==3.00000000000000004
    var message =  "I dislike ice cream".replace("dislike", "like")

    results_box.innerHTML = message;
}
document.write('<b>Hello World</b>');

</script>


</html>