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 <liangbin...@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 ‘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 > >
