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 <liangbing64@126.com> 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 âwithout spaceâ.
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