sum package:rio

The sum function computes the sum of the numbers of a structure.

Examples

Basic usage:

>>> sum []
0

>>> sum [42]
42

>>> sum [1..10]
55

>>> sum [4.1, 2.0, 1.7]
7.8

>>> sum [1..]
* Hangs forever *

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, generalizing biconcat.

Examples

Basic usage:

>>> biasum (Nothing, Nothing)
Nothing

>>> biasum (Nothing, Just 42)
Just 42

>>> biasum (Just 18, Nothing)
Just 18

>>> biasum (Just 18, Just 42)
Just 18

The bisum function computes the sum of the numbers of a structure.

Examples

Basic usage:

>>> bisum (42, 17)
59

>>> bisum (Right 42)
42

>>> bisum (BiList [13, 29, 4] [18, 1, 7])
72

>>> bisum (BiList [13, 29, 4] [])
46

>>> bisum (BiList [] [])
0

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"

Is this time zone just persisting for the summer?