Last week I've spent a full day to fix very strange behavior in a single page application for my customer that only happens on Chrome 51 (maybe 52, but not in Canary 53).

After a while our SPA started behaving incorrectly...

It turned out to be a nasty bug in the V8 JIT engine.

Try the following in Chrome's developer console:

function foo() {
  return typeof null === "undefined";
}

for(var i=0; i<10000; ++i) console.log(foo())

This should of course always print false, but in Chrome 51, it prints true after about about 100 iterations (it varies...)

I want to warn other web-developers for this bug, to avoid many $$$ being wasted (or becoming insane ;-))

EDIT: The following - more realistic case that we had in third-party library code - will also fail, but after about 10 thousand iterations:

function isUndefined(thing){
    return typeof thing === "undefined";
}

for(var i=0; i<100000; i++) console.log(isUndefined(null));

EDIT: The bug also manifests itself with the more common pattern

typeof x !== "undefined"

UPDATE: I just tried this with the latest stable Chrome (52.0.2743.82), and it now works correctly :)

If you have a JavaScript game that you want to add sound and music too, I'd be happy to put my JavaScript app to the test and create the sound and music for you. Implementation is super easy:

When the game is loading:

 <script src="https://openmusic.gallery/omg.js"></script>

 game.music = new OMusicPlayer()
 game.music.prepareSongFromURL("http://openmusic.gallery/data/1333")
 game.laserSound = game.music.getSound("SFX", "laser")

When the game starts:

 game.music.play()

Increase BPM and key when difficulty increases:

 game.music.beatParams.bpm += 20

 game.music.keyParams.rootNote++
 game.music.rescaleSong()

When the laser is fired:

 game.laserSound.play()

When the game ends:

 game.music.stop()

Example of how it's done

https://www.youtube.com/watch?v=TXpPFBkpXp0

If you have a JS game, send me the link and an explanation of what kind of sound and music you want, and I'll do my best to help!

edit add relevant links

github

https://github.com/mikehelland/openmusic.gallery

the tool

https://openmusic.gallery/gauntlet

And if you already have filed for a refund, please say so here. Intolerance shouldn't be tolerated, especially one that is founded on fabricated lies, and ridiculously sensitive standards of judgement.