The new std.process is ready for review
Vladimir Panteleev
vladimir at thecybershadow.net
Tue Mar 12 01:28:01 PDT 2013
On Tuesday, 12 March 2013 at 07:41:03 UTC, Lars T. Kyllingstad
wrote:
> On Wednesday, 6 March 2013 at 07:27:19 UTC, Lars T. Kyllingstad
> wrote:
>> On Tuesday, 5 March 2013 at 21:04:15 UTC, Vladimir Panteleev
>> wrote:
>>> 5. How about that Environment.opIn_r?
>>
>> Forgot about it. :) I'll add it.
>
> So I sat down to write this function, but then I reconsidered.
> The thing is, checking whether the variable exists is exactly
> the same operation as retrieving it. In other words, this:
>
> if (key in environment)
> {
> auto val = environment[key];
> ...
> }
>
> is equivalent to:
>
> if (environment.get(key) !is null)
> {
> auto val = environment.get(key);
> ...
> }
Yes, it's just syntax sugar, and an operation supported by AAs
(which environment imitates). It's useful if you don't want to
retrieve the value of a variable right after checking if it
exists - you just want to see if it's there or not.
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