Re: [Boston.pm] catenation of undef with string, 2 cases

Uri Guttman <uri-X/[email protected]> writes:

> On 11/09/2016 02:04 PM, Bill Ricker wrote:
>> I think Uri and Ricky have it nailed.
>>
>> You can
>> wrap with do{ no warnings; ...  }  or
>> protect the concatenation with  42 . ($b//q()); or equivalent ?: or or
>> use $b .= 42 ; if order doesn't matter (it usually does, though)
>> or initialized $b to '' instead of undef, knowing it will be
>> concatenated (but in that case be sure it's tested for Truth not
>> Definedness)
>>
>>
> just to add on, i use .= so often. i like to build up strings and then
> return the whole string. i never initialize them to '' as i know .=
> works without warning. this is true for scalars and data structures as
> i said before. any lvalue undef can be used in this way.
>
> uri
>

Thanks everyone. Especially thanks for relating it to +=. I have trouble
remembering the handy special cases but when it's somewhat systematic
that helps.

-- 
Mike Small
[email protected]