On: A game whose source code fits in one tweet

[wunderlust]

What exactly is happening here: "a.style.margin=++s+e%300"? (Specifically, the "++" part.)

[mgraczyk → wunderlust]

Increment global state variable, add it to e, which is the number of milliseconds the game has been running modulo 300. Then set the margin size to that value. It's a simple pseudo-pseudorandom number generator.

[andrewmunsell → wunderlust]

In case any one was wondering the difference between "s++" and "++s" (the former of which is probably more common), prepending the "++" increments the variable before returning it, whereas appending it would increment after returning the value.

The code you posted is essentially equivalent to "s = s + 1; a.style.margin = s + e % 300".

[SapphireSun → wunderlust]

    s += 1
    a.style.margin = (s + e) % 300

[marpstar → wunderlust]

increments `s` before evaluating the expression and adds it to (e % 300)

[username → wunderlust]

++ will increment s before the new margin is set.