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Ternary Operator
Posted: Sun Feb 10, 2013 5:46 pm
by Raylin
Hey, guys.
Does Lua have a quick fix for the ternary operator?
Or do I need to set some metatables for it?
Re: Ternary Operator
Posted: Sun Feb 10, 2013 6:18 pm
by Saegor
i don't understand your question
wath fix do you speak about ?
the fact that
don't work as expected ?
Re: Ternary Operator
Posted: Sun Feb 10, 2013 6:30 pm
by Raylin
Saegor wrote:the fact that
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.
Re: Ternary Operator
Posted: Sun Feb 10, 2013 6:34 pm
by Saegor
Raylin wrote:Saegor wrote:the fact that
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
Re: Ternary Operator
Posted: Sun Feb 10, 2013 6:50 pm
by Raylin
I'm trying to emulate the same functionality that the question mark ((test)?a:b) would give.
Re: Ternary Operator
Posted: Sun Feb 10, 2013 6:59 pm
by 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
Re: Ternary Operator
Posted: Sun Feb 10, 2013 10:43 pm
by Robin
Raylin wrote: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.
Re: Ternary Operator
Posted: Mon Feb 11, 2013 1:30 am
by Raylin
Thanks, guys. Robin's answer pretty much sealed the deal.