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elliotpotts/st.hs

Last active May 2, 2017 17:10
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st.hs
type Var = String
type Z = Int
type State = Var -> Z
emptyState :: State
emptyState = const 0
assign :: State -> Var -> Z -> State
assign oldst name var x = if x == name then value else oldst x
assign' :: State -> Var -> Z -> State
assign' oldst name var = \x -> if x == name then value else oldst x
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