LUA Boot Camp

[etron]

While I am trying to learn yet another language, I figured I would start this thread, which would document all the 'basics' of programming in LUA. The official Girder documentation does contain a lot of information, I spent way too much time trying to find out how to do some of the basic things. So let's put all the useful examples in this thread.

Some basic LUA rules:
LUA is case sensitive
to comment out a line, start the line with 2 dashes. Example: --this is a comment
Ending lines with a semi-colon is optional


Would be great if this thread could be set 'sticky', making it easier to find this basic knowledge.

[etron]

Simple if-else examples:

if varA == 0 and varB == 0 then
return "yes"
else
return "false"
end

Valid operators can be found in the Girder manual (PDF file in your Program Files directory).

[etron]

Splitting a delimited string into a usable array (similar to explode() in PHP). Keep in mind that the array starts at 1, not 0 as in most other languages:


local strTest = "yellow|red|green"
local arrTest = string.Split(strTest, "|")

print(arrTest[1])
print(arrTest[2])
print(arrTest[3])

This would print:

yellow
red
green

[Ron]

personal favorite function



table.print(arrTest)


will print the complete array in one go.

[Solosid]

come on all,

keep 'em coming....

trying to learn Lua

every days a school day....

Mark

[heinoskriver]

Hi
I'm also trying to learn...
When you use print ex. print(arrTest[1])
Where can you se the output? Could be usefull for debugging i think.

[Rob H]

The output should appear in the Interactive Lua Scripting Console (see the view menu)

[heinoskriver]

So it does. Thanks..