Block vs List
[1/4] from: Patrick::Philipot::laposte::net at: 19-Jun-2004 11:30
Hi List What is the difference between a block and a list? The only thing I've got from the Core manual is that a block is a "Blocks of values" and a list a "Linked lists". Is there a command that can be used on a block and cannot be used on a list?
>> a: [1 2 3 4]
== [1 2 3 4]
>> b: make list! [1 2 3 4]
== make list! [1 2 3 4]
>> type? a
>> type? b
== list! -- Regards Patrick
[2/4] from: carl:cybercraft at: 19-Jun-2004 23:42
>=== Original Message > >Hi List
<<quoted lines omitted: 3>>>Is there a command that can be used on a block and cannot be used on a >list?
Not that I know of, but some give different results. The Core manual does give a good explanation of lists in the Values section and how they differ - I suspect you just missed it. See... http://www.rebol.com/docs/core23/rebolcore-16.html#section-2.8 HTH. -- Carl Read
[3/4] from: rotenca:telvia:it at: 19-Jun-2004 20:32
> Is there a command that can be used on a block and cannot be used on a > list?
All action! which can work with block! can work also with list! and hash!. But there are many native! and function! which are different: 1) set l: make list! [1 2] b: make block! [1 2] set [a b] b print [a b] set [a b] l print [a b] 2) list! and hash! cannot be filled with code to execute. Every command which requires a block to be executed does not accept a list! or an hash!. Functions that require a block! for some parameters and do not accept a series are many dozens. --- Ciao Romano
[4/4] from: atruter:labyrinth:au at: 20-Jun-2004 10:34
> What is the difference between a block and a list?
You may be interested in some performance comparisons I did last time this question came up: http://www.rebol.org/cgi-bin/cgiwrap/rebol/ml-display-message.r?m=rmlQMYQ Regards, Ashley
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