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.