were both victim of a DDoS today. Silently, I always hoped that a really long-lasting one will convince them to put effort in a distributed scheme.
Maybe I should be waiting for another Wave.
Posts Tagged ‘stupid’
Twitter and Facebook
Friday, August 7th, 2009Damned DOM (1)
Monday, June 22nd, 2009When I wanted to react to any changes to a input textbox immediately, my first instrinct was to use onChange. onChange, however, is called when the input loses focus. onKeyPress then? Isn’t called on backspaces. onKeyDown, maybe? It does get called, but the effect of the keystroke isn’t yet applied, for the return value determines whether it that is done in the first place. (Same story for onKeyPress by the way.) onKeyUp does work a bit, except if someone is holding down a single key, for a while.
The solution: hook onKeyUp and use setTimeout with a timeout of 0. Yugh. I hate DOM.
Big Fat Disclaimer: I actually tested this only on one browser.
Javascript’s stupid Date constructor
Wednesday, April 29th, 2009
new Date(2009, 1, 1) represents the first of February 2009. Not the second of February nor the first of January. Why this stupidity?
Stupid PHP (1) (Strings are faster than Arrays)
Sunday, September 23rd, 2007When I slowly build a big string out of little bits, the worst thing to do in most languages is to just use string concatenation:
for(something) {
str += little_bit;
}
Why? Everytime a little bit is added to str, there must be a new string allocated big enough to contain str and the new little bit. Then the actual str must be copied in. In most languages there are constructs to efficiently build strings like this instead of concatenating. StringBuffer in C#. StringIO in Python.
But no, PHP has to be stupid. There is no nice construct and you’ll end up using concatenation. So, I thought to be smart and make use of PHP array’s and implode. Arrays are here for having elements added and removed all the time so they are properly buffered and should be great at having lots of small elements added. And when I want to pack it all into one big string, I can use PHP’s builtin implode function.
I wanted to try it out and created two scripts: a.php concats a little (10byte) string one million times and b.php appends it to an array and then implodes it. And because I’m also interested in the performance of implode I got a script c.php that’s identical to b.php but doesn’t implode afterwards. These are the results:
| a.php (concat) | 0.320s |
|---|---|
| b.php (array append and implode) | 0.814s |
| c.php (array append) | 0.732s |
Indeed, string concatenation with all its allocation and copying is actually faster than plain simple array appending. PHP is stupid.
Stupid IE (2)
Sunday, September 2nd, 2007To create a multiple select-box with javascript you need a very ugly hack in IE.
if (navigator.appName.match(/Internet Explorer/)) {
fsel = document.createElement(\'<SELECT MULTIPLE>\');
} else {
fsel = document.createElement(\'select\');
fsel.multiple = true;
}
Stupid IE (1)
Sunday, September 2nd, 2007if(!Array.prototype.indexOf) {
Array.prototype.indexOf = function(el) {
var i = 0;
for(; i < this.length; i++)
if(this[i] == el)
return i;
return -1;
};
}