[racket] problems with the term 'symbol'
Er, that should read " '#(1 xyz) is really just shorthand for (quote #(1
xyz))
On Mon, Oct 13, 2014 at 12:00 PM, Bryan Coutts <b2coutts at uwaterloo.ca>
wrote:
> Since ' expands to quote, '#(1 xyz) is really just shorthand for (quote (1
> xyz)). Note that quote recursively quotes its arguments; for the same
> reason that '(a b) is a list that contains the *symbols* 'a and 'b, '#(1
> xyz) is a vector that contains 1 and the symbol 'xyz.
>
> On Mon, Oct 13, 2014 at 11:53 AM, Christian Wagenknecht <
> c.wagenknecht at hszg.de> wrote:
>
>> With regard of Racket's symbols I have a problem with the consistency of
>> the terminology as follows.
>> A symbol in Scheme and maybe in earlier Racket versions is considered as
>> an identifier. For example xyz is a symbol, whereas 'xyz avoids the
>> evaluation of xyz.
>>
>> In current version the little ' (normally as shorthand for quote) belongs
>> to the symbol. For example 'xyz is a symbol. A symbol is obviously
>> considered as a quoted identifier, at least syntactically.
>>
>> However, when using a symbol as part of an expression the prepending '
>> disappears. For example: (vector 1 'xyz), consisting of a number and a
>> symbol evaluates to '#(1 xyz). But xyz is not a symbol but an identifier.
>> Therefore to say that this vector belongs of a number and a symbol is no
>> longer valid. (vector-ref '#(1 xyz) 1) returns 'xyz, which is correct,
>> however, this is also visually a difference where there is none.
>>
>> Could you help me to get it right, please?
>>
>>
>> ____________________
>> Racket Users list:
>> http://lists.racket-lang.org/users
>>
>>
>
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