This is similar to most languages, when you use a if statement, all variables
declared within are local to the if branch and are invalid outside of it.
If size is known at compile time you can use `when` instead which doesn't
create a new scope:
proc f(size: static int=1) =
when size == 1:
let
widFrame = 320
hiFrame = 200
else:
let
widFrame = 3200
hiFrame = 2000
echo (widFrame, hiFrame)
f()
Run
Otherwise, use if-expression
proc f(size=1) =
let
widFrame = if size == 1: 320
else: 3200
hiFrame = if size == 1: 200
else: 2000
echo (widFrame, hiFrame)
f()
Run
Note that I'm assuming this is a toy example, otherwise it might be better to
pass a size + scaling factor.
