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[REBOL] generalities of addresses and values... Re:(3)

From: brett:codeconscious at: 10-Oct-2000 18:39

> ok. I think I get it now. Everything is basically done as a reference.
Even setting words. This is much simpler than what I was thinking :-) Um...
> a: 5 > b: a > > in this example, b is a reference to a (right?).
Nope. b is set with the result of evaluating a.
>> a: 5
== 5
>> b: a
== 5
>> a: 3
== 3
>> a
== 3
>> b
== 5
> The thing that was confusing me was that the copy function doesn't always
create a new copy. In deep series, it creates a reference to copied value....strange...
> By the way, is there any way to prove that b is a reference to a ( in the
above example) ? I know you can do it if you set the value of as a series datatype (by using insert or other series function). But how do you prove that b references a for number datatypes? I showed above that b is not a reference to a. Here's another way to look at it. You could set the word "b" to have a value which is literally the word "a" - by doing this:
>> b: 'a
== a You could then see the value of the word "b" by
>> get 'b
== a or evaluting b
>> b
== a and combining
>> get b
== 3 Which evaluates b to a value, in this case a word, and then applies the get function to that value.