[REBOL] Re: Evaluating words...
From: twatkins:datajunction at: 25-Sep-2001 11:49
Rough Gestimate:
If it's a simple operation(like an assignment or other math
operation) the return value is the result of that
operation(Decimal/Integer/...)
if it is a more complex interaction(probably involving function
calls and native stuff), then the return value(say if you are doing
a one-liner with a lot of results returning as parameters for other
function calls) might be some sort of pointer to the code that
was/is processed(Instruction Sequence).
It goes on to say that when that sequence is evaluated, the actual
return value, is the return value of the last instruction(ie, you
have a function that ends in an assignment, the return value of the
function is the return value of that assignment)
Of course I am just a lurker on the list, and I don't do much with
Rebol, but this is MY interpretation from what I have seen on the
list and the little coding I have done.
----- Original Message -----
From: "mgkiourt" <[mgkiourt--otenet--gr]>
To: <[rebol-list--rebol--com]>
Sent: Tuesday, September 25, 2001 11:14 AM
Subject: [REBOL] Evaluating words...
Could you please elucidate the following taken from a textbook
In the case of values that have a scalar datatype like decimal!,
the evaluation results in the value itself.
In more complex situations, a word may reference an instruction
sequence.
The value of the word is that sequence of instructions.During the
value's evaluation, each instruction is evaluated.
The evaluatiuon concludes with the last instruction in the
expression sequence.Then the result of executing the last
instruction in the expression sequence is returned as the value of
that word.
