[REBOL] forming a string from a block but inserting a separation character Re:
From: brian:hawley:bigfoot at: 28-Aug-2000 20:28
[princepawn--lycos--com] wrote:
>s: [ 9 8 7 6 5 4 3 2 1 ]
>
>How do I create the string "9.8.7.6.5.4.3.2.1" from it?
A simple way, good for most purposes, but incorrect when the
elements contain spaces:
new-s: replace/all form s " " "."
A faster way, and correct when the elements contain spaces:
new-s: make string! 2 * length? s
foreach x s [new-s: insert insert new-s x #"."]
new-s: head clear back new-s
This is faster mostly because all of the calls are native. Adjust
the initial string length for element data type - overestimate if
you have to.
This method is faster yet:
parse/all new-s: form s [any [to " " x: (change x #".")]]
but it clobbers 'x and has same trouble with spaces in the data as
the first example. Note that the [to " "] parse rule is faster than
a [to #" "] rule would be, for reasons unknown.
Which method you would use depends on circumstances. Usually the
first method will do just fine. I like parse though... :)
>I thought that reform would have a /sepchar refinement, but it didnt.
Interesting idea.
Brian Hawley
