Find if keys are in two dimensional associative array

[Michal Minich]

On Sun, 17 Jan 2010 15:08:08 +0100, Mike Wey wrote:

> This should work.
> 
> float[int][char] aa;
> 
> aa['a'][123] = 4.56;
> 
> if ( 123 in aa['a'] )
> 	writeln(true);
> else
> 	writeln(false);


if 'a' is not there then "aa['a'] will either return null, or exception 
(I don't know exactly). This is not good in any case, because then asking 
"123 in null" will crash always...