traverse_ package:relude

Map each element of a structure to an Applicative action, evaluate these actions from left to right, and ignore the results. For a version that doesn't ignore the results see traverse. traverse_ is just like mapM_, but generalised to Applicative actions.

Examples

Basic usage:

>>> traverse_ print ["Hello", "world", "!"]
"Hello"
"world"
"!"

Map each element of a structure using one of two actions, evaluate these actions from left to right, and ignore the results. For a version that doesn't ignore the results, see bitraverse.

Examples

Basic usage:

>>> bitraverse_ print (print . show) ("Hello", True)
"Hello"
"True"

>>> bitraverse_ print (print . show) (Right True)
"True"

>>> bitraverse_ print (print . show) (Left "Hello")
"Hello"