Which of the following is the definition of a higher-order function? Odbl x = x * 2

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
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QUESTION 1
Which of the following is the definition of a higher-order function?
db1 x = x * 2
scnd (x:y: zs) = y
appl f [x, y] = [f x, fyl
swp (x, y) = (y,x)
ssqrs xs = sum (map (^2) xs)
Transcribed Image Text:QUESTION 1 Which of the following is the definition of a higher-order function? db1 x = x * 2 scnd (x:y: zs) = y appl f [x, y] = [f x, fyl swp (x, y) = (y,x) ssqrs xs = sum (map (^2) xs)
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