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Re: Does anyone else do this?

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ArceusInator is not online. ArceusInator
Joined: 10 Oct 2009
Total Posts: 30553
07 Jan 2014 09:19 PM
I've been noticing myself doing this a lot lately and I was wondering if it's something that everyone else does too

Say I have five parts, instead of writing out five lines (and then maybe having to edit five lines later on) I'll do something like this

for partNumber, part in pairs{partA, partB, partC, partD, partE} do
part.Transparency = 0.5
end


Is there a better way of doing this? It looks very readable to me and it's easy to edit, so I'm always inclined to go straight to it even if I only have two parts.
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HaxHelper is not online. HaxHelper
Joined: 19 Dec 2009
Total Posts: 1208
07 Jan 2014 09:21 PM
I do that for anything more than two parts
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cntkillme is not online. cntkillme
Joined: 07 Apr 2008
Total Posts: 44956
07 Jan 2014 09:24 PM
I never had a case where I wanted to change only some parts in a model, it was always all, one, or nothing for me. So not really
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ArceusInator is not online. ArceusInator
Joined: 10 Oct 2009
Total Posts: 30553
07 Jan 2014 09:31 PM
@cnt; This is specifically for parts. I most recently used this to cycle through nodes on a grid. I have to cycle through three at a time, so I was using

for nodeIndex, node in pairs{group.A, group.B, group.C} do
--
end
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ArceusInator is not online. ArceusInator
Joined: 10 Oct 2009
Total Posts: 30553
07 Jan 2014 09:31 PM
*this isn't

Of course I mis-type the most important word in the post.
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Notunknown99 is not online. Notunknown99
Joined: 05 Sep 2008
Total Posts: 25360
07 Jan 2014 09:35 PM
I use next, but I do do that.

Lazy ftw!
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Notunknown99 is not online. Notunknown99
Joined: 05 Sep 2008
Total Posts: 25360
07 Jan 2014 09:35 PM
I also iterate through a table of tables to create interface buttons instead of making them one at a time :P

Again, lazy ftw!
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cntkillme is not online. cntkillme
Joined: 07 Apr 2008
Total Posts: 44956
07 Jan 2014 09:37 PM
That works I guess, I would probably do something weird like:

function makeTransparency(trans, ...)
local parts = {...} for i, v in next, parts do v.Transparency=trans end
end
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Notunknown99 is not online. Notunknown99
Joined: 05 Sep 2008
Total Posts: 25360
07 Jan 2014 09:38 PM
Why not just skip out local parts = {...}?

for i, v in next, {...} do v.Transparency=trans end
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cntkillme is not online. cntkillme
Joined: 07 Apr 2008
Total Posts: 44956
07 Jan 2014 09:38 PM
sometimes I return the table from the function, and it seems better to just create a variable as a table then to do {...} twice
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Notunknown99 is not online. Notunknown99
Joined: 05 Sep 2008
Total Posts: 25360
07 Jan 2014 09:46 PM
I meant for that specific example, but forgot to mention it.
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ArceusInator is not online. ArceusInator
Joined: 10 Oct 2009
Total Posts: 30553
07 Jan 2014 11:19 PM
I never learned how to use next. Is it

for [index], [value] in next, [list] do
...

?
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Notunknown99 is not online. Notunknown99
Joined: 05 Sep 2008
Total Posts: 25360
07 Jan 2014 11:22 PM
Yes, that's it.
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suremark is not online. suremark
Joined: 13 Nov 2007
Total Posts: 6315
07 Jan 2014 11:24 PM
For varargs, I like to do

for _, arg in pairs{...} do
    -- do stuff
end
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ArceusInator is not online. ArceusInator
Joined: 10 Oct 2009
Total Posts: 30553
07 Jan 2014 11:28 PM
"for partNumber, part"

"for i,v"

"for _"

The readability of the code in this thread is declining at an alarming rate.
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suremark is not online. suremark
Joined: 13 Nov 2007
Total Posts: 6315
07 Jan 2014 11:29 PM
Underscores are a perfectly readable and acceptable convention for unused variables.
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cntkillme is not online. cntkillme
Joined: 07 Apr 2008
Total Posts: 44956
07 Jan 2014 11:30 PM
I never use i, v. I usually use key, value or index, value but oh well
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ArceusInator is not online. ArceusInator
Joined: 10 Oct 2009
Total Posts: 30553
07 Jan 2014 11:35 PM
If a variable is unused it doesn't exist. That fact that _ exists in the environment means it's being used, even if its value has no affect on the code itself. Using _ can result in forgetting how your table is indexed in larger projects, and it can help push you into the trap of using one-letter shorthand variables like cnt was doing with his i,v. Of course this is small code and we all know what it means, but I know for a fact that difficult-to-read code can and will result in dead projects when they last longer than your short-term memory. I don't want to see many people giving up on or restarting their projects just because they can't read their own code.
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Notunknown99 is not online. Notunknown99
Joined: 05 Sep 2008
Total Posts: 25360
07 Jan 2014 11:38 PM
If you yourself are not using a variable the convention is to have _ in its place.
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suremark is not online. suremark
Joined: 13 Nov 2007
Total Posts: 6315
07 Jan 2014 11:39 PM
What you say is true, but in the case of {...} the indices are not necessary. Plus, the variables used in a 'for' loop are local to that stack. They won't interfere with the rest of your code.
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Notunknown99 is not online. Notunknown99
Joined: 05 Sep 2008
Total Posts: 25360
07 Jan 2014 11:39 PM
Although I do not often use it unless I have for loops within for loops and do not use the i's.
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HaxHelper is not online. HaxHelper
Joined: 19 Dec 2009
Total Posts: 1208
07 Jan 2014 11:40 PM
it's usually not a good idea to use single-letter variable names in any case
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MettaurSp is not online. MettaurSp
Joined: 20 Mar 2010
Total Posts: 3179
07 Jan 2014 11:44 PM
I use '_' as a variable name rarely, but it is always for an unused variable so I know it is unused.
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OneTrueGodTheHolyCow is not online. OneTrueGodTheHolyCow
Joined: 24 Oct 2013
Total Posts: 9350
08 Jan 2014 03:09 AM
In Lua "_" doesn't mean anything. It's just a 1-letter variable.

So since it doesn't do anything, you might as well just have the name "Index" instead in case you end up wanting to use it.

But still, I always just use an underscore, I rarely need the index and if I do it's not going to take ages to undo or anything
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cntkillme is not online. cntkillme
Joined: 07 Apr 2008
Total Posts: 44956
08 Jan 2014 05:26 PM
ctrl h "_" "index" tada
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