Evaluate each monadic action in the structure from left to right, and
collect the results. For a version that ignores the results see
sequence_.
Examples
Basic usage:
The first two examples are instances where the input and and output of
sequence are isomorphic.
>>> sequence $ Right [1,2,3,4]
[Right 1,Right 2,Right 3,Right 4]
>>> sequence $ [Right 1,Right 2,Right 3,Right 4]
Right [1,2,3,4]
The following examples demonstrate short circuit behavior for
sequence.
>>> sequence $ Left [1,2,3,4]
Left [1,2,3,4]
>>> sequence $ [Left 0, Right 1,Right 2,Right 3,Right 4]
Left 0