Strangest language feature

[Eóin]

Fantastic question (thread?) from over on stack overflow. Plenty of things in there I never knew about. For example:

In JavaScript:
'5' + 3 gives '53'
Whereas
'5' - 3 gives 2

From reddit originally

[Deozaan]

That was fun to read through.

[MilesAhead]

ahk can't be too far behind with this usage:

Code

If 0 < 1
{
	MsgBox, 64, DummyApp Usage, Usage: DummyApp params
	ExitApp
}

To anyone coming from another programming language, the If statement should always be true, like "while 1" ... but not so!!

[Renegade]

I liked this (Algol):

Code: (c#)

int a[3] = { 1, 2, 3 };
int i = 1;

void f(int j)
{
    int k;
    k = j;  // k = 2
    i = 0;
    k = j;  // k = 1 (!?!)    
}

int main()
{
    f(a[i]);
}

At first glance, it looks hosed, but reading through starting at main() it makes perfect sense. My question then is... Sanity? Are you there?

Thanks for that link! Some very cool stuff in there.

[f0dder]

Renegade: ugh, everything is passed by reference?

[Eóin]

Even if passed by ref that still doesn't make much sense

[f0dder]

Even if passed by ref that still doesn't make much sense

No, it would have to be... copied by reference? - very strange behavior for what I would expectto be a value type.