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From: shang@corp.mot.com (David L. Shang)
Subject: Re: Combining dynamic and static typing
Date: 1997/01/28
Message-ID: <1997Jan28.160420.28915@schbbs.mot.com>#1/1
X-Deja-AN: 212828579
sender: news@schbbs.mot.com (SCHBBS News Account)
references: <5celpp$n3r@csugrad.cs.vt.edu>
organization: MOTOROLA 
reply-to: shang@corp.mot.com
newsgroups: 
 comp.lang.eiffel,comp.lang.ada,comp.lang.c++,comp.lang.smalltalk,comp.lang.objective-c,comp.object
Date: 1997-01-28T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <5celpp$n3r@csugrad.cs.vt.edu> nurban@csugrad.cs.vt.edu (Nathan M.  
Urban) writes:
> Thus, Objective-C gives you all the safety of C++'s static type
> checking, while retaining all the advantages of a dynamic language.

The advantage of static type checking is type error prevention:
to prevent type errors before it can happen.

Therefore, Objective-C cannot give the benefit of a static typing
system. Objective-C detects the type errors such as "Not a String"
at run-time. It does detection, not prevention! Detection is usually
not a solution to a problem. It is like an irresponsible doctor saying:
"Now I find what is wrong with you, it's your responsibility to figure
how to fix it. Want my suggetion? -- peace die -- crash!"

David Shang