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Basic if statements

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Posted by SR388   (4 posts)  [Biography] bio
Date Sun 09 Dec 2007 07:05 AM (UTC)
Message
I've learned how to check variables and modify them based on certain data, such as the example below:

crit = tonumber (GetVariable ("crit")) or 0
crit = crit + 1
SetVariable ("crit", crit)

I'm curious how to enter a command based on a variable. For example,

crit = tonumber (GetVariable ("crit")) or 0
if crit = 1 [execute command]
if crit = 2 [execute some other command]

This way I can set up an automated chain of events from start to finish.
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Posted by Onoitsu2   USA  (248 posts)  [Biography] bio
Date Reply #1 on Sun 09 Dec 2007 08:12 AM (UTC)
Message
something like this

if crit == 1 then
WHATEVER
elseif crit == 2 then
WHATEVER ELSE
end -- if

the --if is optional but can be recommended so you know that is the end of an if statement and not a loop or other block structure that uses the 'end' as a termination word.

-Onoitsu2
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Posted by Isthiriel   (113 posts)  [Biography] bio
Date Reply #2 on Sun 09 Dec 2007 11:22 AM (UTC)
Message
Also, as your scripts become more complicated, indentation is your friend. Use an editor that has a fixed width font (aka monospaced, such as Courier New) and then make matching levels of nested blocks to line up vertically so you can see at a glance what code belongs to which block, like so:


function doSomething(stuff)
  for key, val in pairs(stuff)
    if val != nil then
      print(key .. ":" .. val)
    end --if
  end --for
end --doSomething()


How much you indent is a matter of personal choice. Holy wars are fought over whether two-space, three-space, four-space and tabs-instead-of-spaces is the "best".
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Posted by Shaun Biggs   USA  (644 posts)  [Biography] bio
Date Reply #3 on Mon 10 Dec 2007 05:24 PM (UTC)
Message
If you are looking to make a switch or case statement, it might also be useful to make a table of values or functions. See this post for a few more details: http://www.gammon.com.au/forum/?id=7891 Granted, most of that is just me being bored rather than being useful, but there is a nice little example of a set of if/elseif statements with return values.

It is much easier to fight for one's ideals than to live up to them.
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