Ternary Operator

[Raylin]

Hey, guys.
Does Lua have a quick fix for the ternary operator?
Or do I need to set some metatables for it?

[Saegor]

i don't understand your question

wath fix do you speak about ?

the fact that

Code: Select all

v = v and false or true

don't work as expected ?

[Raylin]

the fact that

Code: Select all

v = v and false or true

don't work as expected ?

Well, it looks like that only returns true or false upon testing v.
I need a operator that can execute a piece of code if something is true else, execute another piece of code.

[Saegor]

the fact that

Code: Select all

v = v and false or true

don't work as expected ?

Well, it looks like that only returns true or false upon testing v.
I need a operator that can execute a piece of code if something is true else, execute another piece of code.

in fact it don't work because the second argument is false. it's the main problema with ternary operators in Lua

for your problem, what do you think of

Code: Select all

function love.update()
some_function(condition and "instruct_1" or "instruct_2")
end


function some_function(instruct)

if instruct == "instruct_1" then
...
end

elseif instruct == "instruct_2" then
...
end
end

ps : some issues with firefox, no more tabbing

else, explain maybe more accurately your problem

[Raylin]

I'm trying to emulate the same functionality that the question mark ((test)?a:b) would give.

[markgo]

Have you tried this? I'm not sure what is so difficult.

Code: Select all

v = (v and func1() or func2()) and v

or

Code: Select all

if v then
...
else
...
end

[Robin]

I'm trying to emulate the same functionality that the question mark ((test)?a:b) would give.

In Lua, that would be test and a or b, but only if a is always a truthy value. If you can't guarantee that, you're stuck using if-statements.

[Raylin]

Thanks, guys. Robin's answer pretty much sealed the deal.