Comment by toolslive

besides being really insane typing wise, javascript also both really lenient and unpredictable in what it accepts as expressions. Try to guess the result of the following expressions:

    > [] + []
    >
    > {} + []
    >
    > [] + {}
    >
    > {} + {}

It means that if you feed it nonsense it does not stop you but happily carries on and explodes a few milliseconds later somewhere else. Another can of worms is the difference between null, 0,undefined, '', ....

Ok, you got me worked up. I need to go for a run to blow off steam.