Sum package:numhask

A wrapper for an Additive which distinguishes the additive structure

Compute the sum of a Foldable.

>>> sum [0..10]
55

Compute the accumulating sum of a Traversable.

>>> accsum [0..10]
[0,1,3,6,10,15,21,28,36,45,55]

The sum of a collection of actions using (<|>), generalizing concat. asum is just like msum, but generalised to Alternative.

Examples

Basic usage:

>>> asum [Just "Hello", Nothing, Just "World"]
Just "Hello"

The sum of a collection of actions using (<|>), generalizing concat. msum is just like asum, but specialised to MonadPlus.

Examples

Basic usage, using the MonadPlus instance for Maybe:

>>> msum [Just "Hello", Nothing, Just "World"]
Just "Hello"