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How to implement "subst" and "subst_exp" functions in haskell

How to implement "subst" and "subst_exp" functions in haskell

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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How to implement "subst" and "subst_exp" functions in haskell?

79 substVars :: [Var] -> [Var] -> Base -> Base 80 81 substVars vs' vs phi = foldl ((flip.uncurry) subst) phi (zip vs' vs) 82 83 subst phi y x = phily/x] - 84 85 subst :: Exp -> Var -> Base -> Base 86 87 subst y x f = error "TODO" 88 89 90 subst_exp :: Exp -> Var -> Exp -> Exp 91 92 subst_exp e1 x e2 = error "TODO: FILL THIS IN" N
Transcribed Image Text:79 substVars :: [Var] -> [Var] -> Base -> Base 80 81 substVars vs' vs phi = foldl ((flip.uncurry) subst) phi (zip vs' vs) 82 83 subst phi y x = phily/x] - 84 85 subst :: Exp -> Var -> Base -> Base 86 87 subst y x f = error "TODO" 88 89 90 subst_exp :: Exp -> Var -> Exp -> Exp 91 92 subst_exp e1 x e2 = error "TODO: FILL THIS IN" N
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