Re: [Pharo-users] About asSymbol message , some questions in my mind

[Igor Stasenko]

On 13 February 2017 at 13:48, lb  wrote:

> Just To You,  :-)
> Symbol  ,  a sign with some meaning in nature language.
> eg, #% = percent, #$ = dollar.
> but
>  2.  '$%%&' asSymbol no meaning
>
> symbol as a message should have his meaning. defined in its method.
> a message should let programmer know what to do.
>
>
I come from China , My English is poor.
>

Hmm.. Then why it is so hard for you to comprehend such simple concept?
In Chinese you have thousands unique glyphs,
that you can use for writing, and each one has own meaning. Sometimes they
literally mean something,
but sometimes the meaning depends on context.
That means that symbols '@#&%@#$' may not have meaning for most uses,
while for some other can. This depends on context.

Now if you take into account that in English, there's not so many glyphs
for letter,
so you have to use combination(s) of them to form words, phrases etc.. that
could have meaning
in specific context, while not have in other.


>
>
Cheers.
>
> Bing
>
> 在 2017-02-13 07:26:05，"john pfersich"  写道：
>
> BUT There are not compliant below
> 1.' ' asSymbol no meaning
> 2.  '$%%&' asSymbol no meaning
> 3.  'sign' asSymbol = 'sign ' asSymbol   >>>  false because of space.
> 3. '  one two  three ' asSymbol  >>>I think It should
> become three symbols = #one, #two, #three
>
> I don't know what you mean by "no meaning', they're symbols.
> Try this in a Playground, it works in Pharo 5"
>
> | oc sym filtered|
> oc := ' one two  three $%%&' splitOn: ' '.
> sym := OrderedCollection new.
> oc do: [:each | sym add: each asSymbol].
> filtered := OrderedCollection new.
> filtered := sym select: [ :each | each ~= #'' ].
> Transcript show: sym printString; cr.
> Transcript show: filtered printString; cr.
>
> On Fri, Feb 10, 2017 at 8:56 PM, lb  wrote:
>
>> Hi,
>> I know Symbol is subclass of String.
>> Any string object can become symbol object by sending 'asSymbol' message..
>> I think  symbol must has its meaning in comon use, so the symbol should
>> be composed of alphabet or number ‘without space“.
>>
>> BUT There are not compliant below
>> 1.' ' asSymbol no meaning
>> 2.  '$%%&' asSymbol no meaning
>> 3.  'sign' asSymbol = 'sign ' asSymbol   >>>  false because of space.
>> 3. '  one two  three ' asSymbol  >>>I think It should
>> become three symbols = #one, #two, #three
>>
>>
>> Mybe my understanding is wrong.
>>
>> Bing Liang
>>
>>
>>
>


-- 
Best regards,
Igor Stasenko.

Re: [Pharo-users] About asSymbol message , some questions in my mind

[lb]

Just To You,  :-)
Symbol  ,  a sign with some meaning in nature language.
eg, #% = percent, #$ = dollar.
but
 2.  '$%%&' asSymbol no meaning

symbol as a message should have his meaning. defined in its method.
a message should let programmer know what to do.



I come from China , My English is poor.


Cheers.


Bing


在 2017-02-13 07:26:05，"john pfersich"  写道：

BUT There are not compliant below
1.' ' asSymbol no meaning
2.  '$%%&' asSymbol no meaning
3.  'sign' asSymbol = 'sign ' asSymbol   >>>  false because of space.
3. '  one two  three ' asSymbol  >>>I think It should become 
three symbols = #one, #two, #three


I don't know what you mean by "no meaning', they're symbols.

Try this in a Playground, it works in Pharo 5"

| oc sym filtered|
oc := ' one two  three $%%&' splitOn: ' '.
sym := OrderedCollection new.
oc do: [:each | sym add: each asSymbol].
filtered := OrderedCollection new.
filtered := sym select: [ :each | each ~= #'' ].
Transcript show: sym printString; cr.
Transcript show: filtered printString; cr.



On Fri, Feb 10, 2017 at 8:56 PM, lb  wrote:

Hi,
I know Symbol is subclass of String.
Any string object can become symbol object by sending 'asSymbol' message..
I think  symbol must has its meaning in comon use, so the symbol should be 
composed of alphabet or number ‘without space“.


BUT There are not compliant below
1.' ' asSymbol no meaning
2.  '$%%&' asSymbol no meaning
3.  'sign' asSymbol = 'sign ' asSymbol   >>>  false because of space.
3. '  one two  three ' asSymbol  >>>I think It should become 
three symbols = #one, #two, #three




Mybe my understanding is wrong.


Bing Liang

Re: [Pharo-users] About asSymbol message , some questions in my mind

[john pfersich]

BUT There are not compliant below
1.' ' asSymbol no meaning
2.  '$%%&' asSymbol no meaning
3.  'sign' asSymbol = 'sign ' asSymbol   >>>  false because of space.
3. '  one two  three ' asSymbol  >>>I think It should
become three symbols = #one, #two, #three

I don't know what you mean by "no meaning', they're symbols.
Try this in a Playground, it works in Pharo 5"

| oc sym filtered|
oc := ' one two  three $%%&' splitOn: ' '.
sym := OrderedCollection new.
oc do: [:each | sym add: each asSymbol].
filtered := OrderedCollection new.
filtered := sym select: [ :each | each ~= #'' ].
Transcript show: sym printString; cr.
Transcript show: filtered printString; cr.

On Fri, Feb 10, 2017 at 8:56 PM, lb  wrote:

> Hi,
> I know Symbol is subclass of String.
> Any string object can become symbol object by sending 'asSymbol' message..
> I think  symbol must has its meaning in comon use, so the symbol should be
> composed of alphabet or number ‘without space“.
>
> BUT There are not compliant below
> 1.' ' asSymbol no meaning
> 2.  '$%%&' asSymbol no meaning
> 3.  'sign' asSymbol = 'sign ' asSymbol   >>>  false because of space.
> 3. '  one two  three ' asSymbol  >>>I think It should
> become three symbols = #one, #two, #three
>
>
> Mybe my understanding is wrong.
>
> Bing Liang
>
>
>

Re: [Pharo-users] About asSymbol message , some questions in my mind

[Ben Coman]

On Sun, Feb 12, 2017 at 10:54 AM, lb  wrote:
> Hi Ben，
> Thank you very much, your answer make me clear like water.
> My question aimed on where, which type errors occur when perform a message.
> My usecase.
> when perform: aMessage(with a space), get DNU error , cannot find out  by
> eyes directly.

What is the higher level use case? For example, are you getting input
from a user that you evaluate as a command in some kind of Domain
Specific Language?  In such a case you may be better to validate the
command has no spaces closer to the UI?

>
> asMessage is better than asSymbol.

If you don't get community support for this, you can start extending
String like this for your own projects and later promote your concrete
experience with it.

cheers -ben

>
> Cheers  Bing
>
> At 2017-02-12 00:39:55, "Ben Coman"  wrote:
>>Hi Bing Liang,
>>
>>Thanks for your comments.  Fresh eyes provide interesting perspectives
>>on things we take for granted.
>>
>>On Sat, Feb 11, 2017 at 4:41 PM, lb  wrote:
>>> Thank you, Sven
>>> gradually clear.
>>> 1. Symbol as String subclass, only guarantees a symbol object only one in
>>> system, use ==;
>>> 2. keywords (selector name method name)  are spectial symbols, without
>>> space
>>> or forbided characters;
>>> 3. perform: aSymbol, means perform: aKeyword,
>>
>>Not exactly.  It means perform a "message" where there are three types
>>of messages...
>>* unary, like #printString
>>* binary, like #+
>>* keyword, like #perform: or
>>#subclass:instanceVariableNames:classVariableNames:package:
>>having a colon appended to each keyword
>>
>>>  Should we add asKeyword to String,
>>> let
>>> perform: aString asKeyword
>>
>>or alternatively per above...  perform: aString asMessage
>>
>>>  not
>>> perform: aString asSymbol ?
>>
>>In the case that aString contained a space,
>>presumably #asMessage would produce a runtime error in asMessage
>>whereas #asSymbol would produce a runtime error in #perform:
>>I guess there is a minor benefit of failing early but will that make
>>much difference in practice.
>>Do you have a use case where it makes a major difference?
>>
>>
>>> At 2017-02-11 15:51:49, "Sven Van Caekenberghe"  wrote:
Hi Bing,

Yes, any character is allowed in a Symbol. There is even special syntax
 that allows such Symbols to be represented literally.

'a b' asSymbol.

  => #'a b'

Although it might be confusing, I don't see any problem.

The concept of 'meaning' is defined by the user, the usage, not by the
 Symbol itself. A Symbol with a space cannot be a selector
 (message/method)
 name, but that does not mean a Symbol with a space could not be useful
 in
 some other context.

> On 11 Feb 2017, at 05:56, lb  wrote:
>
> Hi,
> I know Symbol is subclass of String.
> Any string object can become symbol object by sending 'asSymbol'
> message..
> I think  symbol must has its meaning in common use, so the symbol
> should
> be composed of alphabet or number ‘without space“.
>>
>>Different domains have different common usage.
>>IIUC, Smalltalk's definition of symbol is from the 1970s.
>>Pharo is not overly constrained by Smalltalk traditions, but there
>>must be sufficient gain to balance deviations from consistency with
>>other Smalltalks.
>>
>
> BUT There are not compliant below
> 1.' ' asSymbol no meaning
> 2.  '$%%&' asSymbol no meaning
> 3.  'sign' asSymbol = 'sign ' asSymbol   >>>  false because of space.
> 3. '  one two  three ' asSymbol  >>>I think It should
> become three symbols = #one, #two, #three
>
>
> Maybe my understanding is wrong.
>>
>>no problem.  Being wrong is a great way to learn ;)
>>
>>cheers -ben
>>

[Pharo-users] About asSymbol message , some questions in my mind

[lb]

Hi, Dnenis
Thank you.

Your sample gives me some tips on AI , NLP. 

Cheers


Bing



在 2017-02-11 22:18:14，"Denis Kudriashov"  写道：



2017-02-11 8:51 GMT+01:00 Sven Van Caekenberghe :
The concept of 'meaning' is defined by the user, the usage, not by the Symbol 
itself. A Symbol with a space cannot be a selector (message/method) name

But it could be:


Point methodDict at: #'name with space' put: Point>>#x.


2@3 perform: #'name with space' "==> 2"


Only problem that we could not use them with normal syntax

Re: [Pharo-users] About asSymbol message , some questions in my mind

[lb]

Hi Ben，
Thank you very much, your answer make me clear like water.
My question aimed on where, which type errors occur when perform a message.
My usecase.
when perform: aMessage(with a space), get DNU error , cannot find out  by eyes 
directly.


asMessage is better than asSymbol.

Cheers  Bing
At 2017-02-12 00:39:55, "Ben Coman"  wrote:
>Hi Bing Liang,
>
>Thanks for your comments.  Fresh eyes provide interesting perspectives
>on things we take for granted.
>
>On Sat, Feb 11, 2017 at 4:41 PM, lb  wrote:
>> Thank you, Sven
>> gradually clear.
>> 1. Symbol as String subclass, only guarantees a symbol object only one in
>> system, use ==;
>> 2. keywords (selector name method name)  are spectial symbols, without space
>> or forbided characters;
>> 3. perform: aSymbol, means perform: aKeyword,
>
>Not exactly.  It means perform a "message" where there are three types
>of messages...
>* unary, like #printString
>* binary, like #+
>* keyword, like #perform: or
>#subclass:instanceVariableNames:classVariableNames:package:
>having a colon appended to each keyword
>
>>  Should we add asKeyword to String,
>> let
>> perform: aString asKeyword
>
>or alternatively per above...  perform: aString asMessage
>
>>  not
>> perform: aString asSymbol ?
>
>In the case that aString contained a space,
>presumably #asMessage would produce a runtime error in asMessage
>whereas #asSymbol would produce a runtime error in #perform:
>I guess there is a minor benefit of failing early but will that make
>much difference in practice.
>Do you have a use case where it makes a major difference?
>
>
>> At 2017-02-11 15:51:49, "Sven Van Caekenberghe"  wrote:
>>>Hi Bing,
>>>
>>>Yes, any character is allowed in a Symbol. There is even special syntax
>>> that allows such Symbols to be represented literally.
>>>
>>>'a b' asSymbol.
>>>
>>>  => #'a b'
>>>
>>>Although it might be confusing, I don't see any problem.
>>>
>>>The concept of 'meaning' is defined by the user, the usage, not by the
>>> Symbol itself. A Symbol with a space cannot be a selector (message/method)
>>> name, but that does not mean a Symbol with a space could not be useful in
>>> some other context.
>>>
 On 11 Feb 2017, at 05:56, lb  wrote:

 Hi,
 I know Symbol is subclass of String.
 Any string object can become symbol object by sending 'asSymbol'
 message..
 I think  symbol must has its meaning in common use, so the symbol should
 be composed of alphabet or number ‘without space“.
>
>Different domains have different common usage.
>IIUC, Smalltalk's definition of symbol is from the 1970s.
>Pharo is not overly constrained by Smalltalk traditions, but there
>must be sufficient gain to balance deviations from consistency with
>other Smalltalks.
>

 BUT There are not compliant below
 1.' ' asSymbol no meaning
 2.  '$%%&' asSymbol no meaning
 3.  'sign' asSymbol = 'sign ' asSymbol   >>>  false because of space.
 3. '  one two  three ' asSymbol  >>>I think It should
 become three symbols = #one, #two, #three


 Maybe my understanding is wrong.
>
>no problem.  Being wrong is a great way to learn ;)
>
>cheers -ben
>

Re: [Pharo-users] About asSymbol message , some questions in my mind

[Ben Coman]

On Sun, Feb 12, 2017 at 12:39 AM, Ben Coman  wrote:
> Hi Bing Liang,
>
> Thanks for your comments.  Fresh eyes provide interesting perspectives
> on things we take for granted.
>
> On Sat, Feb 11, 2017 at 4:41 PM, lb  wrote:
>> Thank you, Sven
>> gradually clear.
>> 1. Symbol as String subclass, only guarantees a symbol object only one in
>> system, use ==;
>> 2. keywords (selector name method name)  are spectial symbols, without space
>> or forbided characters;
>> 3. perform: aSymbol, means perform: aKeyword,
>
> Not exactly.  It means perform a "message" where there are three types
> of messages...
> * unary, like #printString
> * binary, like #+
> * keyword, like #perform: or
> #subclass:instanceVariableNames:classVariableNames:package:
> having a colon appended to each keyword
>
>>  Should we add asKeyword to String,
>> let
>> perform: aString asKeyword
>
> or alternatively per above...  perform: aString asMessage
>
>>  not
>> perform: aString asSymbol ?
>
> In the case that aString contained a space,
> presumably #asMessage would produce a runtime error in asMessage
> whereas #asSymbol would produce a runtime error in #perform:
> I guess there is a minor benefit of failing early but will that make
> much difference in practice.
> Do you have a use case where it makes a major difference?
>
>
>> At 2017-02-11 15:51:49, "Sven Van Caekenberghe"  wrote:
>>>Hi Bing,
>>>
>>>Yes, any character is allowed in a Symbol. There is even special syntax
>>> that allows such Symbols to be represented literally.
>>>
>>>'a b' asSymbol.
>>>
>>>  => #'a b'
>>>
>>>Although it might be confusing, I don't see any problem.
>>>
>>>The concept of 'meaning' is defined by the user, the usage, not by the
>>> Symbol itself. A Symbol with a space cannot be a selector (message/method)
>>> name, but that does not mean a Symbol with a space could not be useful in
>>> some other context.
>>>
 On 11 Feb 2017, at 05:56, lb  wrote:

 Hi,
 I know Symbol is subclass of String.
 Any string object can become symbol object by sending 'asSymbol'
 message..
 I think  symbol must has its meaning in common use, so the symbol should
 be composed of alphabet or number ‘without space“.
>
> Different domains have different common usage.
> IIUC, Smalltalk's definition of symbol is from the 1970s.
> Pharo is not overly constrained by Smalltalk traditions, but there
> must be sufficient gain to balance deviations from consistency with
> other Smalltalks.
>

 BUT There are not compliant below
 1.' ' asSymbol no meaning
 2.  '$%%&' asSymbol no meaning
 3.  'sign' asSymbol = 'sign ' asSymbol   >>>  false because of space.
 3. '  one two  three ' asSymbol  >>>I think It should
 become three symbols = #one, #two, #three


 Maybe my understanding is wrong.
>
> no problem.  Being wrong is a great way to learn ;)
>
> cheers -ben

P.S. Even wikipedia says "Symbols can contain whitespace (and all
other characters)"
https://en.wikipedia.org/wiki/Symbol_(programming)
so it must be okay ;)

cheers -ben

Re: [Pharo-users] About asSymbol message , some questions in my mind

[Sven Van Caekenberghe]

> On 11 Feb 2017, at 15:18, Denis Kudriashov  wrote:
> 
> 
> 2017-02-11 8:51 GMT+01:00 Sven Van Caekenberghe :
> The concept of 'meaning' is defined by the user, the usage, not by the Symbol 
> itself. A Symbol with a space cannot be a selector (message/method) name
> 
> But it could be:
> 
> Point methodDict at: #'name with space' put: Point>>#x.
> 
> 2@3 perform: #'name with space' "==> 2"
> 
> Only problem that we could not use them with normal syntax

Cool.

Or we could use any Unicode character, like icons and emoticons ;-)

Re: [Pharo-users] About asSymbol message , some questions in my mind

[Denis Kudriashov]

2017-02-11 8:51 GMT+01:00 Sven Van Caekenberghe :

> The concept of 'meaning' is defined by the user, the usage, not by the
> Symbol itself. A Symbol with a space cannot be a selector (message/method)
> name


But it could be:

Point methodDict at: #'name with space' put: Point>>#x.

2@3 perform: #'name with space' "==> 2"


Only problem that we could not use them with normal syntax

Re: [Pharo-users] About asSymbol message , some questions in my mind

[Sven Van Caekenberghe]

> On 11 Feb 2017, at 09:41, lb  wrote:
> 
> Thank you, Sven
> gradually clear.
> 1. Symbol as String subclass, only guarantees a symbol object only one in 
> system, use ==;
> 2. keywords (selector name method name)  are spectial symbols, without space 
> or forbided characters;
> 3. perform: aSymbol, means perform: aKeyword,
>  Should we add asKeyword to String,
> let
> perform: aString asKeyword 
>  not
> perform: aString asSymbol ?

Good point, there has been discussion about a Selector class in the past, but I 
think the conclusion was, more or less, that it was not worth it (too much 
work/complexity for little gain).

> Regards!
> 
> Bing Liang
> 
> At 2017-02-11 15:51:49, "Sven Van Caekenberghe"  wrote:
> >Hi Bing,
> >
> >Yes, any character is allowed in a Symbol. There is even special syntax that 
> >allows such Symbols to be represented literally.
> >
> >'a b' asSymbol. 
> >
> >  => #'a b'
> >
> >Although it might be confusing, I don't see any problem.
> >
> >The concept of 'meaning' is defined by the user, the usage, not by the 
> >Symbol itself. A Symbol with a space cannot be a selector (message/method) 
> >name, but that does not mean a Symbol with a space could not be useful in 
> >some other context.
> >
> >Regards,
> >
> >Sven
> >
> >> On 11 Feb 2017, at 05:56, lb  wrote:
> >> 
> >> Hi,
> >> I know Symbol is subclass of String.
> >> Any string object can become symbol object by sending 'asSymbol' message..
> >> I think  symbol must has its meaning in comon use, so the symbol should be 
> >> composed of alphabet or number ‘without space“.
> >> 
> >> BUT There are not compliant below
> >> 1.' ' asSymbol no meaning
> >> 2.  '$%%&' asSymbol no meaning
> >> 3.  'sign' asSymbol = 'sign ' asSymbol   >>>  false because of space.
> >> 3. '  one two  three ' asSymbol  >>>I think It should 
> >> become three symbols = #one, #two, #three
> >> 
> >> 
> >> Mybe my understanding is wrong.
> >> 
> >> Bing Liang
> >> 
> >> 
> >
> >
> 

[Pharo-users] About asSymbol message , some questions in my mind

[lb]

Thank you, Sven
gradually clear.
1. Symbol as String subclass, only guarantees a symbol object only one in 
system, use ==;
2. keywords (selector name method name)  are spectial symbols, without space or 
forbided characters;
3. perform: aSymbol, means perform: aKeyword,
 Should we add asKeyword to String,
let
perform: aString asKeyword 
 not
perform: aString asSymbol ?


Regards!


Bing Liang


At 2017-02-11 15:51:49, "Sven Van Caekenberghe"  wrote:
>Hi Bing,
>
>Yes, any character is allowed in a Symbol. There is even special syntax that 
>allows such Symbols to be represented literally.
>
>'a b' asSymbol. 
>
>  => #'a b'
>
>Although it might be confusing, I don't see any problem.
>
>The concept of 'meaning' is defined by the user, the usage, not by the Symbol 
>itself. A Symbol with a space cannot be a selector (message/method) name, but 
>that does not mean a Symbol with a space could not be useful in some other 
>context.
>
>Regards,
>
>Sven
>
>> On 11 Feb 2017, at 05:56, lb  wrote:
>> 
>> Hi,
>> I know Symbol is subclass of String.
>> Any string object can become symbol object by sending 'asSymbol' message..
>> I think  symbol must has its meaning in comon use, so the symbol should be 
>> composed of alphabet or number ‘without space“.
>> 
>> BUT There are not compliant below
>> 1.' ' asSymbol no meaning
>> 2.  '$%%&' asSymbol no meaning
>> 3.  'sign' asSymbol = 'sign ' asSymbol   >>>  false because of space.
>> 3. '  one two  three ' asSymbol  >>>I think It should become 
>> three symbols = #one, #two, #three
>> 
>> 
>> Mybe my understanding is wrong.
>> 
>> Bing Liang
>> 
>> 
>
>

Re: [Pharo-users] About asSymbol message , some questions in my mind

[Sven Van Caekenberghe]

Hi Bing,

Yes, any character is allowed in a Symbol. There is even special syntax that 
allows such Symbols to be represented literally.

'a b' asSymbol. 

  => #'a b'

Although it might be confusing, I don't see any problem.

The concept of 'meaning' is defined by the user, the usage, not by the Symbol 
itself. A Symbol with a space cannot be a selector (message/method) name, but 
that does not mean a Symbol with a space could not be useful in some other 
context.

Regards,

Sven

> On 11 Feb 2017, at 05:56, lb  wrote:
> 
> Hi,
> I know Symbol is subclass of String.
> Any string object can become symbol object by sending 'asSymbol' message..
> I think  symbol must has its meaning in comon use, so the symbol should be 
> composed of alphabet or number ‘without space“.
> 
> BUT There are not compliant below
> 1.' ' asSymbol no meaning
> 2.  '$%%&' asSymbol no meaning
> 3.  'sign' asSymbol = 'sign ' asSymbol   >>>  false because of space.
> 3. '  one two  three ' asSymbol  >>>I think It should become 
> three symbols = #one, #two, #three
> 
> 
> Mybe my understanding is wrong.
> 
> Bing Liang
> 
> 

Re: [Pharo-users] About asSymbol message , some questions in my mind

[Benoit St-Jean via Pharo-users]

--- Begin Message ---
It can be useful if you want to save some space in some very specific cases.  
You could have a one million strings 'hello' (hence one million objects) or 
deal transform them into symbols and have only one #hello.  I recall a coworker 
telling me about this ultra-fast string search program in Gemstone where they 
transformed a gazillion duplicate strings into symbols thus using wy 
less memory and speeding up the lookup.
 - 
Benoît St-Jean 
Yahoo! Messenger: bstjean 
Twitter: @BenLeChialeux 
Pinterest: benoitstjean 
Instagram: Chef_Benito
IRC: lamneth 
Blogue: endormitoire.wordpress.com 
"A standpoint is an intellectual horizon of radius zero".  (A. Einstein)

  From: lb <liangbin...@126.com>
 To: "pharo-users@lists.pharo.org" <pharo-users@lists.pharo.org> 
 Sent: Friday, February 10, 2017 11:59 PM
 Subject: [Pharo-users] About asSymbol message , some questions in my mind
   
Hi, I know Symbol is subclass of String.Any string object can become 
symbol object by sending 'asSymbol' message..I think  symbol must has its 
meaning in comon use, so the symbol should be composed of alphabet or number 
‘without space“.
BUT There are not compliant below1.    ' ' asSymbol >>>>    no 
meaning2.  '$%%&' asSymbol >>>>    no meaning3.  'sign' asSymbol = 'sign ' 
asSymbol   >>>  false because of space.3. '  one two  three ' asSymbol  
>>>I think It should become three symbols = #one, #two, #three

Maybe my understanding is wrong.
Bing Liang



   --- End Message ---

[Pharo-users] About asSymbol message , some questions in my mind

[lb]

Hi,
I know Symbol is subclass of String.
Any string object can become symbol object by sending 'asSymbol' message..
I think  symbol must has its meaning in comon use, so the symbol should be 
composed of alphabet or number ‘without space“.


BUT There are not compliant below
1.' ' asSymbol no meaning
2.  '$%%&' asSymbol no meaning
3.  'sign' asSymbol = 'sign ' asSymbol   >>>  false because of space.
3. '  one two  three ' asSymbol  >>>I think It should become 
three symbols = #one, #two, #three




Maybe my understanding is wrong.


Bing Liang

[Pharo-users] About asSymbol message , some questions in my mind

[lb]

Hi,
I know Symbol is subclass of String.
Any string object can become symbol object by sending 'asSymbol' message..
I think  symbol must has its meaning in comon use, so the symbol should be 
composed of alphabet or number ‘without space“.


BUT There are not compliant below
1.' ' asSymbol no meaning
2.  '$%%&' asSymbol no meaning
3.  'sign' asSymbol = 'sign ' asSymbol   >>>  false because of space.
3. '  one two  three ' asSymbol  >>>I think It should become 
three symbols = #one, #two, #three




Mybe my understanding is wrong.


Bing Liang