remove first element list haskell

To remove the first element from a list in Haskell, you can use pattern matching or the tail function. Here are two approaches:

Approach 1: Pattern Matching

removeFirst :: [a] -> [a]
removeFirst [] = []  -- handle empty list case
removeFirst (_:xs) = xs  -- match the first element with a wildcard and return the rest of the list

Approach 2: tail function

removeFirst :: [a] -> [a]
removeFirst = tail

In both approaches, the function removeFirst takes a list as input and returns a new list without the first element. The first approach uses pattern matching to match the first element with a wildcard _ and returns the rest of the list. The second approach simply uses the tail function, which returns all elements of a list except the first one.