4. Defining functions

Question 1

Function to split list at a specific index

Answer 1

splitAt :: Int -> [a] -> ([a], [a])
splitAt n xs = (take n xs, drop n xs)

Question 2

What is the syntax of a conditional expression

Answer 2

abs :: Int -> Int
abs n = if n >= 0 then n else -n

Question 3

What is the syntax of a guarded equation?

Answer 3

signum n | n < 0 = -1
| n == 0 = 0
| otherwise = 1

Question 4

Function that uses a lambda expression for getting odd numbers from 0 to n

Answer 4

odds :: Int -> [Int]
odds n = map (\x -> x * 2 + 1) [0..n-1]