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- Exercise P Implement the function lookup that takes a list of tuples, where the first element of the tuple * serves as a key and the second element a value (a list like this is also known as a dictionary), and a key value, then looks up the first occuring element corresponding to that key. The return value is wrapped in the Maybe type, so if the key doean't occur anywhere in the 1ist the function returns Nothing E.x. lookup 2 [(0,'a'),(1, 'b')] *- Nothing lookup 2 ((0, 'a'),(2, 'b'), (2, 'c')] Just 'b' lookup 1: Eq k >k -> [(k, )] -> Maybe v lookup ke da error "TODO implement lookup"

- Exercise P Implement the function lookup that takes a list of tuples, where the first element of the tuple * serves as a key and the second element a value (a list like this is also known as a dictionary), and a key value, then looks up the first occuring element corresponding to that key. The return value is wrapped in the Maybe type, so if the key doean't occur anywhere in the 1ist the function returns Nothing E.x. lookup 2 [(0,'a'),(1, 'b')] *- Nothing lookup 2 ((0, 'a'),(2, 'b'), (2, 'c')] Just 'b' lookup 1: Eq k >k -> [(k, )] -> Maybe v lookup ke da error "TODO implement lookup"

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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Exercise P Implement the function lookup that takes a list of tuples, where the first element of the tuple * serves as a key and the second element a value (a list like this is also known as a dictionary), and a key value, then looks up the first occuring element corresponding to that key. The return value is wrapped in the Maybe type, so if the key doean't occur anywhere in the list the function returns Nothing E.x. lookup 2 [(0,'a'),(1, 'b')] - Nothing lookup 2 ((0, 'a'),(2, 'b'),(2, 'c')] Just 'b' 18 19 lookup 1: Eq k > k -> [(k,v)) Maybe v lookup ko da error "TODO implement lookup" 22
Transcribed Image Text:Exercise P Implement the function lookup that takes a list of tuples, where the first element of the tuple * serves as a key and the second element a value (a list like this is also known as a dictionary), and a key value, then looks up the first occuring element corresponding to that key. The return value is wrapped in the Maybe type, so if the key doean't occur anywhere in the list the function returns Nothing E.x. lookup 2 [(0,'a'),(1, 'b')] - Nothing lookup 2 ((0, 'a'),(2, 'b'),(2, 'c')] Just 'b' 18 19 lookup 1: Eq k > k -> [(k,v)) Maybe v lookup ko da error "TODO implement lookup" 22
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