World: r3wp
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Henrik 21-Jan-2008 [1235] | more like membership. there is no real inheritance in Rebol. |
SteveT 21-Jan-2008 [1236x2] | Yes, MS always partly implemented OO in VS. they didn't think there users could handle them ! Java is more of a full OO implementation but I find you end up having to override most objects and that's not good for code re-use. |
OO is ok but it doesn't always fit the real world (or programming productivity). that's why I think OO Databases have never really been adopted! they fit models but not the real world (Where the customer say's Ahh! didn't we mention that !! (LOL). | |
Anton 21-Jan-2008 [1238x5] | This should be instructive. Type this into the console a line at a time: |
o1: context [my-word: "hello"] o2: context [my-word: "there"] o3: make object! [my-word: "SteveT"] | |
code: [] append code in o1 'my-word append code in o2 'my-word append code bind [my-word] o3 | |
print code | |
I first show two different ways of creating an object, and then I show two different ways of getting a word in an object. | |
SteveT 21-Jan-2008 [1243] | I got a halt-view near my-word? |
Anton 21-Jan-2008 [1244x3] | Show me the code and resulting error. |
Maybe you missed one of the single-quotes before a 'my-word (which makes it a lit-word!) | |
eg. in o1 'my-word ; <-- don't miss the ' | |
SteveT 21-Jan-2008 [1247] | o1: context [mu-word: "hello"] >> o2: context [my-word: "there"] >> o3: make object! [my-word: "SteveT"] >> code: [] == [] >> append code in o1 'my-word == [none] >> append code in o2 'my-word == [none my-word] >> append code bind [my-word] o3 == [none my-word my-word] >> print code none there SteveT Yep think so that 's what i got now |
Anton 21-Jan-2008 [1248] | first line says "mu-word" :) |
SteveT 21-Jan-2008 [1249] | Dohhh! it's this eclectic keyboard lol |
Anton 21-Jan-2008 [1250x6] | 'my-word is therefore not in o1 and so: in o1 'my-word == none |
:) | |
first o1 first o2 | |
Lists the words in each object, if you don't believe what IN is telling you. | |
Or of course you can use HELP or ?. | |
? o1 ? o2 | |
SteveT 21-Jan-2008 [1256] | Think I understand that |
Anton 21-Jan-2008 [1257] | Each word carries its binding with it. ie. a reference to an object. (or no object if it is unbound). |
SteveT 21-Jan-2008 [1258] | Can you get problems if an object gets bound to itself? |
Anton 21-Jan-2008 [1259x2] | An object is a container of word -> value pairs. When you ask for a word's value, the word's binding is checked to get the object. |
An object cannot be bound to anything. Only words can be bound. | |
SteveT 21-Jan-2008 [1261] | Sorry that's what I meant 'Word' |
Anton 21-Jan-2008 [1262x2] | A word isn't really a binding target, so you can't bind a word to itself (or any other word.) |
(BIND accepts a known-word argument. It is the *object* that the known-word is from, not the known-word itself, which is the target for the bind.) | |
SteveT 21-Jan-2008 [1264] | Right - the context it's from ???? |
Anton 21-Jan-2008 [1265x2] | Correct. (context = object). So my above example could be modified to: append code bind [my-word] in o3 'self which is in fact how we used to have to do it, because BIND didn't have object! in list of accepted types for its known-word argument. |
so these are all the same: append code bind [my-word] o3 append code bind [my-word] in o3 'self append code bind [my-word] in o3 'my-word (we would use the 'self word because it's in every object by default.) | |
SteveT 21-Jan-2008 [1267] | The order of execution throws me more than anytihing I would have had to do your code like this code append bind(my-word etc) I'm so used to starting with the item |
Anton 21-Jan-2008 [1268x2] | Are you an ex-forther or something ? |
(sorry, don't mean to sound rude...) | |
SteveT 21-Jan-2008 [1270] | No VB, C'# You tent to start with the object and then using . notation you tell it what action to take on it. |
Anton 21-Jan-2008 [1271] | Ah of course. Much better this way :) |
SteveT 21-Jan-2008 [1272x2] | Rebol you say what you want to do then which object you want to do it to lol |
As I said on my blog I'm just entering my second week of de-programming ;-/ | |
Anton 21-Jan-2008 [1274] | .. rebol is like: VSO = Verb Subject Object VB, C# is like: SVO = Subject Verb Object and Yoda is : OSV |
SteveT 21-Jan-2008 [1275] | Yeah your mind get comfortable one way or the other - takes a lot of breaking |
Anton 21-Jan-2008 [1276x2] | So actually rebol is less like english in that respect. But actually english is crazy. It's better to have the verbs at the front. |
Actually rebol has objects and path notation, so you SVO too. eg. ctx-text/unlight-text | |
SteveT 21-Jan-2008 [1278] | Yes that's where English is wierd for people to learn English say Bus Station Spanish say Station de Autobus perhaps i should Rebol in spanish ;-) |
Anton 21-Jan-2008 [1279] | If you think it would help :) I let you investigate and report your findings :) |
SteveT 21-Jan-2008 [1280x2] | :) |
Thanks for the help Anton brb | |
Anton 21-Jan-2008 [1282] | no prob |
Gregg 21-Jan-2008 [1283x2] | You can use the same kind of notation in REBOL as you would in VB, but using / instead of .(dot). It's called path notation in REBOL, and is used many places (objects, path types, refinements, etc.). Sometimes it's easier or clearer to write things one way or the other. |
Also, in VB there is the WITH statement (USING in C# I think). In REBOL, you can write your own like this: with: func [object block] [ if object [do bind/copy block in object 'self] ] | |
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