Unsafe.md

Module Data.Array.Unsafe

Unsafe helper functions for working with immutable arrays.

Note: these functions should be used with care, and may result in unspecified behavior, including runtime exceptions.

unsafeIndex

unsafeIndex :: forall a. Array a -> Int -> a

Find the element of an array at the specified index.

Note: this function can cause unpredictable failure at runtime if the index is out-of-bounds.

head

head :: forall a. Array a -> a

Get the first element of a non-empty array.

Running time: O(1).

tail

tail :: forall a. Array a -> Array a

Get all but the first element of a non-empty array.

Running time: O(n), where n is the length of the array.

last

last :: forall a. Array a -> a

Get the last element of a non-empty array.

Running time: O(1).

init

init :: forall a. Array a -> Array a

Get all but the last element of a non-empty array.

Running time: O(n), where n is the length of the array.