the $= only works for OpenGL state variables, whereas <- won't work
for them. The difference is that $= is implemented by every member of
the SettableStateVar class differently, so that there may be extra
functionality going on under the hood. The <- operator on the other
hand always has the same meaning (relatively speaking -- it's possible
to override this), in that it is a substitude for
a <- someAction
is the same as
someAction >>= \a -> {- the rest of the do expression -}
-- Jeff
2009/3/20 Mark Spezzano
Hi,
What is the difference between the $= operator and the <- operator
Both seem to read “assign to” but surely there is a difference.
What should I use when?
I want to create an animation that reads some coordinate (state-ful) data.
Should I use $= or <- ?
Cheers,
Mark Spezzano
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