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Posts Tagged ‘JavaScript’

Promises, Promises… Timeout!

25 Apr

I was playing with ES6’s new Promises, for the first time, this week. Then, I was looking at the ugliness of using a browser’s setTimeout() function and thought that it would look better as a Promise.

tl;dr summary: A Simple Promise Version of “setTimeout()”

If we do it right, you simply specify the timeout period and implement a handler for then() to invoke:

timeout(5000) // Delay for 5000 ms
   .then(function () {
      // Do, here, whatever should happen when the time has elapsed…
   });

Or, since this is ES6, we might as well use arrow-function shorthand:

timeout(5000).then( () => {
   // do your thing, here…
})

Implementation

The setTimeout() already functions a bit like a Promise, without matching the promise-pattern and syntax, so converting it to a Promise is pretty easy:

function timeout(delay) {
   return new Promise( 
      (resolve, reject) => setTimeout( resolve, delay )
   )
} // timeout()

This all, in contrast to the “old” way of using setTimeout():

setTimeout(function () {
   // This is where I do my thing, when the timer pops…
}, 5000);

It just looks ugly; the invocation of the timer and its delay-time property is mingled with what happens when the timer triggers. With the promise pattern, the semantics of the invocation and the handling are discretely organized between the timeout() and its then() handler. Read the rest of this entry »

 
 

Fixing an Infected PHP/WordPress Web Server

17 Apr

Fixing an infected WordPress server. Darn if the ISP serving up our PHP and WordPress content wasn’t attacked with an exploit. So I did a lot of learning as I cleaned up my web server, this past weekend. The goal of this exploit was to infect visitors of the web site with viruses by coercing visitors’ browsers to download malware from predefined third-party sites, seeded with the malware. That means modifying web site code to send visitors to those malicious sites.

After noticing some strange behavior that tripped my anti-virus software on my Windows machine, Read the rest of this entry »