World: r3wp
[Core] Discuss core issues
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Steeve 8-Jan-2010 [15433] | I say it again, you didn't give us the real output. Doing some assumptions, i got this. varA: { \'hello\'s ^{Worlds \';} varB: { 'and ^{so "on'; } print rejoin [{<button onclick="alert('} varA {');">CLICK ME</button>} varB ] <button onclick="alert(' \'hello\'s {Worlds \';');">CLICK ME</button> 'and {so "on'; So where is the burden ? i don't see one |
Terry 9-Jan-2010 [15434x2] | Should probably put this in rant.. but just spent the last hour wondering why my function wasn't working result: sofp 'firstname' the solution? change the single quotes to double.. aye carumba |
Steeve, it's cumbersome.. I spend more time joining and escaping than anything else. | |
Henrik 9-Jan-2010 [15436x2] | From all this, the easiest way would be to produce a dialect that does its own escaping, so you don't have to write JS at all. |
rephrasing that: not "easiest way", but easiest to use in the end. | |
Janko 9-Jan-2010 [15438] | as anyone tried to run cheyenne or rebol on sheevaplug ( http://www.globalscaletechnologies.com/t-sheevaplugdetails.aspx ) |
WuJian 9-Jan-2010 [15439] | Good stufff |
Henrik 13-Jan-2010 [15440] | does anyone have a rebol based bracket checking tool? preferrably something that can be integrated into a diagnostic tool. |
Steeve 13-Jan-2010 [15441] | hey ? |
WuJian 14-Jan-2010 [15442] | e ) |
BenBran 14-Jan-2010 [15443] | I have the code: case equal? length? find myLine "text" 4 [...] It fails on ==none I can do it in more lines of code but was wondering the shortest way to get past this. Any suggestions? tia |
Graham 14-Jan-2010 [15444] | what happens if you don't find the text ?? It gives none |
BenBran 14-Jan-2010 [15445x2] | yes that is correct |
I'd like to ignore if it gets 'none' | |
Graham 14-Jan-2010 [15447] | so you have multiple conditions but you're only checking for one |
BenBran 14-Jan-2010 [15448x2] | yes have numerouse cases |
numerous | |
Graham 14-Jan-2010 [15450x2] | I mean you have mulitiple outcomes in that code you have written but you're only checking for one |
if mark: find myline "text" [ ... ] | |
BenBran 14-Jan-2010 [15452] | I don't follow what you mean. |
Graham 14-Jan-2010 [15453] | if all [ mark: find myline "text" 4 = length? mark ][ case [ ] ] |
Maxim 14-Jan-2010 [15454] | the if isn't required here. |
Graham 14-Jan-2010 [15455] | true |
Maxim 14-Jan-2010 [15456] | this is exactly the same: all [ mark: find myline "text" 4 = length? mark case [ ] ] |
Graham 14-Jan-2010 [15457] | all [ mark: find myline "text" 4 = length? mark case [ ] ] |
Maxim 14-Jan-2010 [15458] | hehe |
Graham 14-Jan-2010 [15459] | snap |
BenBran 14-Jan-2010 [15460] | the power of rebol will never cease to amaze me. |
Maxim 14-Jan-2010 [15461] | after a decade I still find new language tricks. I call it the "temporary newbie moment" phenomenon... I've never had these moments in other languages. its like finding a new trick to make your lego stuff stronger while having the same shape ;-) |
Steeve 15-Jan-2010 [15462] | case [ not mark: find myline "text" [none] 4 <> length? mark [none] ... ] |
Graham 15-Jan-2010 [15463] | not so easily read ;) |
Steeve 15-Jan-2010 [15464x6] | don't think so, matter of habit |
is that less readable than a comnination of any/all/case/if ? And you can align your code. CASE hase the most readable structure for complex tests Why should have demonstrate such obvious thing ? ;-) fail: [none] case [ not mark: find myline "text" fail 4 <> length? mark fail ... ] | |
*combination | |
and most of the time, it's the fastest way of doing tests | |
ALL is slow | |
Back in time digression... I have often noticed that it is unemployed as a method for complex testings. In general it's faster and more easily readable than a serie of nested if / else. But to do such, the programmer must know how testings can be complemented and other simplification technics. The novice programmers (whatever the language) often find it difficult to do it correctly. This is probably a gap in computer education. We don't learn anymore the basics of Boolean algebra. At least for me it is an important criterion to determine the general level of someone in computer sciences. If I see too many nested if / else in a program. I think the personn lacks of solid foundations in programming. | |
Maxim 15-Jan-2010 [15470x7] | other languages promote it based on the general suckyness of the case statement in most languages. |
which act more like switch than rebol`s case | |
people often forget that IF, EITHER & UNLESS return values | |
such as val: either success? [blue][red] instead of either success? [ val: blue ][ val: red ] | |
and either in a compose is very powerfull... cause it allows conditional serie content creation). ; when false, an empty block is returned and compose ignores it. draw-blk: compose [ (either gfx? [ [pen black circle 30x30 ][ [ ] ])] this example is simple but when creating very complex draw blocks on the fly, I often have a few cascaded compose blocks, and in some cases, the resulting draw block is an empty block even if it takes 100 lines to get to that. the language will skip the nested composes if an outer condition is false, so in fact, its VERY fast. | |
oops missing a "]" bracket in the above. | |
and if you optimize you can do other stuff, but it gets unreadable real fast. | |
Steeve 15-Jan-2010 [15477x2] | It's not really my point here. There are advanced technics in Rebol to optimize the code. I don't blame anyone to not know them all (me neither). I was comparing nested (messy) testings structures vs. flat (readable) structures. And the reason why people use the bad way and not the right way ;-) |
of course i was talking about others not Rebolers ;-) | |
Maxim 15-Jan-2010 [15479x2] | I know, I'm just providing other advanced rebol styles, where we can use the language's natural philosophy instead of applying learnt patterns. if you look at the compose example, its something completely alien to all other languages I have used. Other functional languages probably share some of this style, but its not as elegent, or done as macros, or the syntax is so obscure as to make it just about impossible to understand in 2 mintues. |
to have conditional data creation code INSIDE the data is not something you see in other languages. its usually a mess of conditionals which try to cover all possible permutations, as you explain... here, there is no need since the data's structure itself will represent all conditions naturally and directly. changing the structure of the data doesn't require code rewriting cause they are one and the same. | |
Ashley 15-Jan-2010 [15481] | The optimization I really like is: if i = 1 [j: 2] with: all [i = 1 j: 2] when I'm reading code it seems to parse in my brain better: "if i equals 1 ... then ... j becomes equal to 2" vs "i equals 1? j becomes equal to 2" blocks seem to introduce a mental "pause" when I read code. |
Steeve 15-Jan-2010 [15482] | optimization ? it's slower |
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