Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Please can someone explain each line alongside each symbol of the expression Please please give a detailed explanation I will upvote it , explicitly pattern matching
4. (Adapted and expanded from the book "Programming in Haskell) Define a function
safetail :: [a] -> [a] that behaves like tail except that it maps [] to [] (instead
of throwing an error). Using tail and isEmpty :: [a] -> Bool, define safetail
using
3. pattern matching
safeTailMatch :: [a] -> [a]
safeTailMatch [] []
safeTailMatch (:xs) = XS
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Transcribed Image Text:4. (Adapted and expanded from the book "Programming in Haskell) Define a function safetail :: [a] -> [a] that behaves like tail except that it maps [] to [] (instead of throwing an error). Using tail and isEmpty :: [a] -> Bool, define safetail using 3. pattern matching safeTailMatch :: [a] -> [a] safeTailMatch [] [] safeTailMatch (:xs) = XS
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