World: r3wp
[Rebol School] Rebol School
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| Geomol 8-Feb-2009 [1892x2] | If you just wanna print the result, PRINT can work on a block, which will be reduced and spaces included in the output: >> print ["Date:" now/date "Time:" now/time] Date: 8-Feb-2009 Time: 23:24:27 |
Another example: >> print ["2 + 2 =" 2 + 2] 2 + 2 = 4 | |
| kib2 8-Feb-2009 [1894x3] | Geomol: awesome, thanks ! (it's very useful for debugging) |
I just found an article on the subject I'm working on : http://www.alistapart.com/stories/simplecontentmanagement/ | |
I don't like the implementation, but the parse rules are worth reading | |
| Geomol 8-Feb-2009 [1897] | For debugging, you'll find PROBE to be very usefull. You can put it in about anywhere in your code, and it will just work as without PROBE. Examples: >> square-root probe 4 * 8 32 == 5.65685424949238 >> read probe join http:// "www.rebol.com" http://www.rebol.com connecting to: www.rebol.com == {<html> ... |
| kib2 8-Feb-2009 [1898] | nice, thanks. Now, I'm looking for something like hashtables (key-value). Is there something special, or do I need to use blocks ? |
| Geomol 8-Feb-2009 [1899x3] | >> if 1:00 > probe now/time [print "Go to bed!"] 0:05:35 Go to bed! |
Try >> ? hash | |
This will create a hashtable, that works like a block, but is faster: >> table: make hash! [a 1 b 12 c 4 d 65] | |
| kib2 8-Feb-2009 [1902x2] | Geomol: sorry, you can go to bed |
Geomol: and thanks a lot for your help | |
| Geomol 8-Feb-2009 [1904x2] | lol :-) it's ok, I'll go to bed in a moment. |
You can read a short intro to hash tables here: http://www.rebol.com/docs/core23/rebolcore-16.html#section-2.5 | |
| kib2 8-Feb-2009 [1906x4] | I just discovered this: |
markup: ["**" "strong" "//" "em" "__" "u" "--" "del" "^^" "sup" ".." "sub"] | |
foreach [bal html] markup [format text bal html] | |
where format is a function I've written. | |
| Geomol 8-Feb-2009 [1910] | REBOL has a build-markup function. |
| kib2 8-Feb-2009 [1911x2] | really ? |
So mine overwrited Rebol's one ? | |
| Geomol 8-Feb-2009 [1913x3] | It may have changed in recent version. Let me check... |
You have build-tag, to-tag and build-markup. | |
Functions to help you make markup text. | |
| Izkata 8-Feb-2009 [1916] | Does hash! work with nested blocks? |
| Geomol 8-Feb-2009 [1917x2] | >> build-tag [a b 1] == <a b="1"> |
Izkata, I don't know. | |
| kib2 8-Feb-2009 [1919x4] | powerful. |
a: 1 | |
build-markup "toto<%a%>" | |
so that's string interpolation too :) | |
| Izkata 8-Feb-2009 [1923] | just tested, looks like it doesn't they way I mean:
>> type? second Z: make hash! [One [F1 {Hi} F2 {Bye}] Two [F1 {Yes}
F2 {No}]]
== block!
However, this works:
>> Z/2: make hash! Z/2
|
| Geomol 8-Feb-2009 [1924] | It seems, it does, if you do it like this: >> t: make hash! compose [a (make hash! [a 43 b 34]) b (make hash! [a 34 b 87])] == make hash! [a make hash! [a 43 b 34] b make hash! [a 34 b 87]] >> type? t/2 == hash! >> t/b == make hash! [a 34 b 87] >> t/b/a == 34 |
| Izkata 8-Feb-2009 [1925] | yeah |
| Geomol 8-Feb-2009 [1926] | kib, yes |
| Izkata 8-Feb-2009 [1927] | When you mentioned it was faster, I got curious, as I need speed for some data mining algorithms I'm implementing in Rebol for a class |
| Geomol 8-Feb-2009 [1928x4] | It states in the documentation, that using hash can increase the speed hundreds of times, if you have large tables. |
A simple timing function to test performance:
time: func [:f /local t][
t: now/time/precise
do f
now/time/precise - t
]
| |
>> time [loop 1000000 [pi ** 2]] == 0:00:00.468 | |
I've never used build-markup, I just realize. | |
| Janko 8-Feb-2009 [1932] | it is normal that hash! will only hash "keys" of assoc on first level, if you want on sublevels you can iterate the list and turn it into hashes acordingly .. if you have a lot of data hash is a lot faster 650x in this test http://www.rebol.com/article/0020.html |
| kib2 8-Feb-2009 [1933] | Geomol: funny, you can test any function like this, it's cool. |
| Geomol 8-Feb-2009 [1934] | kib, yes :-) |
| Janko 8-Feb-2009 [1935] | kib2: technically , that is not a function but a block of code (which is very usefull) :) .. sorry to be a smartass |
| kib2 8-Feb-2009 [1936] | Is there any tool to edit and view at the same time rebDoc files ? I've an idea... |
| Geomol 8-Feb-2009 [1937x2] | kib, like "Easy VID"? Go to ViewTop and REBOL.com/Demos/Easy VID When you read a page, you can click the code and see how it evaluate. |
The whole Easy VID is a 15.1 kb script. You can right-click an icon on the ViewTop to see source, size, etc. | |
| kib2 8-Feb-2009 [1939x3] | Geomol: no, I mean something to write documentations for a rebol lib. |
but Easy VID is really great (but I don't like the fonts) | |
2 secs, I'm making a screenshot | |
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