Fill in the skeleton given for pipe which uses foldl' to get a function pipe :: [(a -> a)] →> (a -> a) such that pipe [f1,...,fn] x (where f1,..., fn are functions!) should return f1(f2(...(fn x))). Again, your task is to fill in the appropriate values for 1. the step function f and 2. the base cas base. Once you have implemented the function, you should get the following behavior: ghci> pipe [] 3 3 ghci> pipe [(\x -> x+x), (\x -> x + 3)] 3 12 ghci> pipe [(\x -> x * 4), (\x -> x + x)] 3 24

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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| `pipe [f1,..., fn] x` should return `f1 (f2(... (fn x)))`
>>> pipe [] 3
3
>>> pipe [(x −> x+x), (\x -> x + 3)] 3
12
>>> pipe [(\x -> x * 4), (\x -> x + x)] 3
24
pipe: [(a -> a)] -> (a -> a)
pipe fs
= foldLeft f base fs
where
f a x = error "TBD: pipe: f"
base = error "TBD: pipe: base"
Transcribed Image Text:48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | `pipe [f1,..., fn] x` should return `f1 (f2(... (fn x)))` >>> pipe [] 3 3 >>> pipe [(x −> x+x), (\x -> x + 3)] 3 12 >>> pipe [(\x -> x * 4), (\x -> x + x)] 3 24 pipe: [(a -> a)] -> (a -> a) pipe fs = foldLeft f base fs where f a x = error "TBD: pipe: f" base = error "TBD: pipe: base"
Fill in the skeleton given for pipe which uses foldl' to get a function
pipe :: [(a -> a)] -> (a -> a)
such that pipe [f1,...,fn] x (where f1,..., fn are functions!) should return
f1(f2(...(fn x))) .
Again, your task is to fill in the appropriate values for
1. the step function f and
2. the base case base.
Once you have implemented the function, you should get the following behavior:
ghci pipe [] 3
3
ghci> pipe [(\x −> x+x), (\x −> x + 3)] 3
12
ghci> pipe [(\x -> x * 4), (\x -> x + x)] 3
24
0₁
Transcribed Image Text:Fill in the skeleton given for pipe which uses foldl' to get a function pipe :: [(a -> a)] -> (a -> a) such that pipe [f1,...,fn] x (where f1,..., fn are functions!) should return f1(f2(...(fn x))) . Again, your task is to fill in the appropriate values for 1. the step function f and 2. the base case base. Once you have implemented the function, you should get the following behavior: ghci pipe [] 3 3 ghci> pipe [(\x −> x+x), (\x −> x + 3)] 3 12 ghci> pipe [(\x -> x * 4), (\x -> x + x)] 3 24 0₁
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