Re: Lua 5.1 (work6) now available
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- Subject: Re: Lua 5.1 (work6) now available
- From: Chris Marrin <chris@...>
- Date: 2005年5月19日 06:59:55 -0700
Adriano Ferreira wrote:
Each one of these operators or prefixes (* or #) has its load of
meanings in another programming languages. It is difficult to chose
which one makes more sense in the context of Lua.
For example,
* (C/C++)
- dereferencing pointers in expressions
- declaring pointer types in declarations
* (Ruby, Python, Perl6)
- syntactic sugar for what Lua unpack does: f(*p) = f(p[0], p[1], ...)
In Perl 6 known as the splat operator
# (Smalltalk)
- used as a prefix for Symbols (which are Smalltalk parlance for
Lisp/Scheme atoms)
But why have a primitive operator for this at all? It seems like having
a library function call to return this information would be sufficient.
In fact, Lua has such a thing, or more precisely it has two, right? One
to return the number of contiguous numeric indices and one to return the
total number of properties. So why the operator? I think adding modulus
'%' is a good idea because this is such a fundamental operator. But if
you want to add new operators, then the bitwise operators or '+=', etc.
would seem like a better choice, wouldn't it?
--
chris marrin ,"",ドル
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"As a general rule,don't solve puzzles that open portals to Hell"'