[REBOL] Array access and paths
From: dankelg8::cs::man::ac::uk at: 18-May-2001 15:21
On Tue, 15 May 2001, Joel Neely wrote:
> ... (And, of course, I'll be the first to cheer if REBOL 3.0
> turns out to be wonderful for array-based numerical computation.
> However, it will take changes BOTH in performance AND notation
> before that happy state arrives.)
I think this is the single most annoying thing about REBOL.
Dealing with matrices etc is a nightmare!!
I think there are a few problems with paths.
At first, they look like a replacement for array indexing in other
languages, but the fact that they only support a limited way of getting
values is a big annoyance.
Here is an example:
list: [A 0 B 5 C 0 D 0]
Say I want to change the number 5 following the B to 6.
It's easy to read this number:
>> list/B
== 5
Or more generally:
>> idx: 'B
== B
>> list/:idx
== 5
So far it looks very good.
But then, try changing this value!
>> change at list 'B 6
does not work.
>> change next find list 'B 6
Not very nice.
Another example:
I want to get a function from an array:
>> func-array: reduce [a: func [x][]]
== [func [x][]]
>> f: :func-array/1
** Script Error: 1 is missing its x argument
** Near: f: :func-array/1
Gisle
