[Pharo-dev] nil inspect

Nicolas Cellier nicolas.cellier.aka.nice at gmail.com
Thu Nov 23 05:18:52 EST 2017


The right way to verify this is with a snippet:

    nil isKindOf: Object.

Check the answer...

2017-11-23 11:14 GMT+01:00 Dimitris Chloupis <kilon.alios at gmail.com>:

> looks like wikipedia agrees with me, but I have to confess never looked at
> the Pharo implementation so I may still be wrong
>
> "*Smalltalk-80* syntax is rather minimalist, based on only a handful of
> declarations and reserved words. In fact, only six "keywords" are reserved
> in Smalltalk: true, false, nil, self, super, and thisContext. These are
> actually called *pseudo-variables*, identifiers that follow the rules for
> variable identifiers but denote bindings that the programmer cannot change.
> The true, false, and nil pseudo-variables are singleton
> <https://en.wikipedia.org/wiki/Singleton_pattern> instances. self and
> super refer to the receiver of a message within a method activated in
> response to that message, but sends to super are looked up in the
> superclass of the method's defining class rather than the class of the
> receiver, which allows methods in subclasses to invoke methods of the same
> name in superclasses. thisContext refers to the current activation
> record. The only built-in language constructs are message sends,
> assignment, method return and literal syntax for some objects. From its
> origins as a language for children of all ages, standard Smalltalk syntax
> uses punctuation in a manner more like English than mainstream coding
> languages. The remainder of the language, including control structures for
> conditional evaluation and iteration, is implemented on top of the built-in
> constructs by the standard Smalltalk class library. (For performance
> reasons, implementations may recognize and treat as special some of those
> messages; however, this is only an optimization and is not hardwired into
> the language syntax.)"
>
> https://en.wikipedia.org/wiki/Smalltalk
>
> Or maybe there is more here tha meets the eye ?
>
> On Thu, Nov 23, 2017 at 12:10 PM Dimitris Chloupis <kilon.alios at gmail.com>
> wrote:
>
>> is it ? I always thought it was just one of those things that is not an
>> object , together with super and self. I vaguelly remember that 5-6 words
>> in Smalltalk are not objects.
>>
>> If it is an actual object and not something else wrapped in a very thin
>> object, I can see the reason for inspection. Otherwise I cannot say I see
>> it.
>>
>> On Thu, Nov 23, 2017 at 10:45 AM Denis Kudriashov <dionisiydk at gmail.com>
>> wrote:
>>
>>> But it is not nothing. It is real object.
>>>
>>> 2017-11-23 9:03 GMT+01:00 Dimitris Chloupis <kilon.alios at gmail.com>:
>>>
>>>> Personally I love it
>>>>
>>>>  what you find when you search for nothing ?
>>>>
>>>> Nothing
>>>>
>>>> :D
>>>>
>>>> On Wed, Nov 22, 2017 at 10:23 PM Stephane Ducasse <
>>>> stepharo.self at gmail.com> wrote:
>>>>
>>>>> Indeed I do not really like the blank window.
>>>>>
>>>>> On Sat, Nov 18, 2017 at 10:18 PM, Nicolas Cellier <
>>>>> nicolas.cellier.aka.nice at gmail.com> wrote:
>>>>>
>>>>>> Ah OK, it's expected then?
>>>>>> I find that surprising, because I could maybe want to look at meta
>>>>>> side like I can for other elementary objects:
>>>>>>
>>>>>> [image: Images intégrées 1]
>>>>>>
>>>>>> 2017-11-18 22:03 GMT+01:00 Aliaksei Syrel <alex.syrel at gmail.com>:
>>>>>>
>>>>>>> Yes
>>>>>>>
>>>>>>> [image: Inline images 1]
>>>>>>>
>>>>>>> Cheers,
>>>>>>> Alex
>>>>>>>
>>>>>>> On 18 November 2017 at 21:56, Nicolas Cellier <
>>>>>>> nicolas.cellier.aka.nice at gmail.com> wrote:
>>>>>>>
>>>>>>>> Anyone tried 'nil inspect' recently?
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>
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