In FP the variable can not be changed once created. Yes, it has much
advantage . However, i feel it is too strict. As we know, the local
variable is allocated on stack which is thread safe.
So if the local variable can be changed, then we can use loop, etc. same as
imperative languages. For example, for (i=0; i<100; i++) where `i` is a
local variable in function.
Any suggestion is appreciated!
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fac n = let { f = foldr (*) 1 [1..n] } in f
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