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From Charles Joynt <>
Subject RE: [DISCUSS] Treating null as false in boolean expressions in Stellar
Date Tue, 19 Jun 2018 11:57:50 GMT
I'd welcome both of these on the grounds that they'll make life easier writing short(er) Stellar
code AND deciphering what someone else has written.

-----Original Message-----
From: Casey Stella [] 
Sent: 16 June 2018 18:33
Subject: Re: [DISCUSS] Treating null as false in boolean expressions in Stellar

I created a PR for the empty collection falseyness as well: so we can choose either of them if we so desire.

On Sat, Jun 16, 2018 at 1:10 PM Casey Stella <> wrote:

> I created a PR for this functionality, in case we decided for it:
> Also, while we're talking, perhaps we should treat empty lists as 
> false as well, like javascript and python.
> So, for instance, if [] then 'blah' else 'foo' would return foo.
> Thoughts?
> On Sat, Jun 16, 2018 at 10:17 AM Casey Stella <> wrote:
>> Right now, because fields may not exist, users can have an awkward time.
>> For instance, checking for is_alert, you end up having to preface 
>> checks with exists(is_alert).
>> For instance, in one of our use-cases:
>> in_outliers
>> we use
>> "is_alert := exists(is_alert) && is_alert", "is_alert := is_alert || 
>> (geo_outlier != null && geo_outlier == true)",
>>  instead of :
>> "is_alert := is_alert || geo_outlier == true",
>> I suggest that we adopt a convention from javascript whereby we 
>> assume a field not existing or being null should act as false in 
>> boolean expressions.  This will simplify stellar's use and hopefully 
>> result in less awkwardness.
>> Thoughts?

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