Human population counter

adminJavaScript0 Comment
3 min. reading

I’ve found a simple and cool JavaScript counter that is able to count current human population and it’s increase every second.

It:

  • takes current date and time,
  • calculates its different toward July 1, 1995 at 00:00:00 (when human population was 5 733 687 096)
  • multiply known “human population increase” factor by the number of seconds that passed since then till now

In this particular (very old — year 1995) example result is printed into form’s text box. With a simple modifications you can have this turned into a actual JavaScript function to return result.

The JavaScript code is:

function popClock()
{
    var t1 = new Date(95, 7, 1, 0, 0, 0);
    var t2 = new Date();
    var exp = (t2 - t1) / 365 / 24 / 3600 / 1000;
    var p = Math.floor(5733687096 * Math.pow(1.01202, exp)) + "";
    var pc = "";
    var len = p.length;
    
    for(i = len - 1; i >= 0; i--)
    {
        pc += p.charAt(len - 1 - i);
        
        if(i&&!(i%3)) pc += ",";
    }
    
    document.popClock.pop.value = pc;
}

setInterval("popClock()", 100);

If you want to get rid of fancy number formatting (adding comma to separate thousands, millions and billion) then you can simplify the above code to:

function popClock()
{
    var t1 = new Date(95, 7, 1, 0, 0, 0);
    var t2 = new Date();
    var exp = (t2 - t1) / 365 / 24 / 3600 / 1000;
    var p = Math.floor(5733687096 * Math.pow(1.01202, exp)) + "";
    
    document.popClock.pop.value = p;
}

setInterval("popClock()", 100);

Add some HTML form code:

<html>
    <head></head>
    <body>
         <form name=popClock>
            Human Population: <input size=14 name=pop>
        </form>
    </body>
</html>

And put one thing (JavaScript code) into another one (HTML). And… that’s it.

Here’s the entire code, both JavaScript and HTML:

<html>
    <head>
    <meta http-equiv="generator" content="tigerii minipad (c)2001">
    </head>

    <body>
         <form name=popClock>
            Human Population:
            <input size=14 name=pop>
        </form>
        
        <script language=javascript>
            function popClock()
            {
                var t1 = new Date(95, 7, 1, 0, 0, 0);
                var t2 = new Date();
                var exp = (t2 - t1) / 365 / 24 / 3600 / 1000;
                var p = Math.floor(5733687096 * Math.pow(1.01202, exp)) + "";
                
                document.popClock.pop.value = p;
            }

            setInterval("popClock()", 100);
        </script>
    </body>
</html>

That’s all folks! :>

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