[Newbies] Smalltalk constants

Mark Volkmann mark at ociweb.com
Wed Nov 5 12:09:12 UTC 2008

On Nov 5, 2008, at 3:43 AM, Delyan Kalchev wrote:

> Hi,
> Is there a good way to create a named constant in Smalltalk. For
> example the name MyNamedConstant to be constant bind to the number 2
> or even to a non-constant object, like the pseudo-variables nil or
> true are bind to their objects and the programmer cannot change them
> to point to other objects.

The recommended way to implement constants in Smalltalk is by writing  
a class method that simply returns the constant value. For example,  
see the class method pi in the Math class. Actually this class also  
represents constants as class variables whose values are set in the  
class initialize method. In this case the class variable Pi is set in  
initialize and that is returned from the class method pi.

Mark Volkmann

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