What the hell are these things ?

[jonhysone]

Hi
I am an JASS amateur. you can say I just understand the syntax

In many spells and systems, I find requirements be :
- Units Indexer ...
- Libraries ...

And some other things lel.

I've read their descriptions, I still don't know their usefulness

Anyone who gives a brief definition for them is kewjl lel, I mean I will appreciate his help

 

[IcemanBo]

Functions in jass have only access to functions that are placed above after compilation.

Example function A takes nothing returns nothing call B() //won't work endfunction function B takes nothing returns nothing call A() // works endfunction

So if you make a system that should work for all functions you must ensure that it gets above them all. How? --> library (library is a vJass feature, not jass)

Hidden library Test function A takes nothing returns nothing endfunction endlibrary

Now all functions have access to function A.

So a library is just a collection of code that is useable by all non-library code, because library compiled code is placed above.

But in case library A needs access to functions from library B, you have to use the requires keyword to ensure correct compilation:

Hidden library A requires B function a takes nothing returns nothing call b() endfunction endlibrary library B function b takes nothing returns nothing endfunction endlibrary

UnitIndexer is just an example for a useful library. It gives an unit specific index for each existing unit, so you can directly work with it.
And that's the sense of libraries. They should include useful code that just gets imported and then can be used easily. We don't want to create each system from scratch for each new project so we import libraries to make life more simple.

You can read more:
http://www.hiveworkshop.com/forums/tutorial-submission-283/simple-jass-tutorial-beginners-251698/
http://www.wc3c.net/vexorian/jasshelpermanual.html#lib

 

[jonhysone]

So you mean vjass is read from bottom to top ? lel

Thanks for information and attached links, very useful

Any additional information are appreciated

 

[IcemanBo]

Yeah, that's normal in jass that you only have access to function above and not to functions below. (in end everything is jass) No problem.

 

[Kazeon]

Functions in jass have only access to functions that are placed above after compilation.

literally, everything in jass (and as far as I know, any other coding languages) can only read/access something that have been defined/declared before.