Geography.VectorTile.Util

Documentation

pairs :: [a] -> Either Text [(a, a)]

A sort of "self-zip", forming pairs from every two elements in a list. Fails if there is an uneven number of elements.

unpairs :: [(a, a)] -> [a]

Flatten a list of pairs. Equivalent to:

ps ^.. each . both

both :: (a -> b) -> (a, a) -> (b, b)

Apply a pure function to both elements of a tuple.

mtoe :: a -> Maybe b -> Either a b

Convert a Maybe to an Either, with some given default value should the result of the Maybe be Nothing.