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HTML

              
                <p>The <b>Double Tilde ( ~~ )</b> is a double bitwise NOT operator often used as a faster / minimalized sub for Math.Floor(). For example:</p> 
<pre>
<b>~~2 === Math.floor(2);</b><br />
<b>Proof:</b>
<code id = 'one'>
</code><br />
<code id = 'two'>
</code>
</pre>
<p>Same with <b><u>positive</u></b> decimals:</p>
<pre>
<b>~~2.5 === Math.floor(2.5);</b><br />
<b>Proof:</b>
<code id = 'three'>
</code>
</pre>
<p>
  Note though that <b>~~</b> does <b><u>NOT</u></b> yield the same results for <b><u>negative</u></b> decimals as Math.Floor() :</p>
<pre>
<b>~~(-2.5) = -2    while    Math.floor(-2.5) = -3 </b><br />
<b>Proof:</b>
<code id = 'four'>
</code>
</pre>
<p><b>
**This is because the double tilde removes everything to the right of the decimal. 
</b><br /><br />
  <b>**</b>Another thing to note is that <b>~~</b> will <b><u>always</u></b> return a number. <br>If it cannot be converted to a number, it will return <b>0</b> ( as opposed to <b>NaN</b> ):
</p>
<pre><b>
~~('k') = 0    while    Math.floor('k') = NaN
</b>
<b>Proof:</b>
<code id = 'five'>
</code>
</pre>
              
            
!

CSS

              
                p {
  margin: 3% 5%;
  line-height: 1.5em;
}

pre {
  margin-left: 8%;
  line-height: 1.5em;
}
              
            
!

JS

              
                var $ = function (id) {
    return document.getElementById(id);
 };
//examples with whole numbers
$('one').innerHTML ="<b>~~2</b> is equal to " +  ~~2 +  " \nand\n<b>Math.floor(2)</b> is equal to " +  Math.floor(2);
console.log(~~2);// ==> 2
console.log(Math.floor(2));// ==> 2

$('two').innerHTML = "<b>~~(-2)</b> is equal to " + ~~(-2) + "\nand\n<b>Math.floor(-2)</b> is equal to " + Math.floor(-2);
console.log(~~(-2));// ==> -2
console.log(Math.floor(-2));// ==> -2

//examples with decimals
$('three').innerHTML = "<b>~~(2.5)</b> is equal to " + ~~(2.5) + "\nand\n<b>Math.floor(2.5)</b> is equal to " + Math.floor(2.5);
console.log(~~(2.5));// ==> 2
console.log(Math.floor(2.5));// ==> 2

$('four').innerHTML = "<b>~~(-2.5)</b> is equal to " + ~~(-2.5) + "\nand\n<b>Math.floor(-2.5)</b> is equal to " + Math.floor(-2.5);
console.log(~~(-2.5));// ==> -2
console.log(Math.floor(-2.5));// ==> -3

$('five').innerHTML = "<b>~~('k')</b> is equal to " + ~~('k') + "\nand\n<b>Math.floor('k')</b> is equal to " + Math.floor('k');
console.log(~~('k')); // ==> 0
console.log(Math.floor('k')); // ==> NaN



              
            
!
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