"in" operator gives a pointer result from a test against an Associative Array?

[Nick Treleaven]

On Friday, 10 May 2024 at 15:23:39 UTC, Andy Valencia wrote:
> On Friday, 10 May 2024 at 03:07:43 UTC, Steven Schveighoffer 
> wrote:
>> Yes, we say that a type has "truthiness" if it can be used in 
>> a condition (`while`, `if`, `assert`, etc).
>
> So if I may ask for one more small clarification... WRT 
> "truthiness", I've observed that empty arrays are treated as 
> false, non-empty as true.

Arrays evaluate to true in boolean conditions if their `.ptr` 
field is non-null. This is bug-prone and I hope we can remove 
this in the next edition.

> However, although I thought a string was basically an immutable 
> array of characters, "" is treated as true, not false?

A string literal's `.ptr` field is always non-null, because it is 
null-terminated.