Configuration.Utils.Operators

Useful operators for defining functions in an applicative context

Documentation

(%) :: (α -> β) -> α -> β infixr 5

This operator is an alternative for $ with a higher precedence. It is suitable for usage within applicative style code without the need to add parenthesis.

(×) :: (α -> β) -> α -> β infixr 5

This operator is a UTF-8 version of % which is an alternative for $ with a higher precedence. It is suitable for usage within applicative style code without the need to add parenthesis.

The hex value of the UTF-8 character × is 0x00d7.

In VIM type: Ctrl-V u 00d7

You may also define a key binding by adding something like the following line to your vim configuration file:

iabbrev <buffer> >< ×

(<*<) :: Applicative φ => φ (β -> γ) -> φ (α -> β) -> φ (α -> γ) infixr 4

Functional composition for applicative functors.

(>*>) :: Applicative φ => φ (α -> β) -> φ (β -> γ) -> φ (α -> γ) infixr 4

Functional composition for applicative functors with its arguments flipped.

(<$<) :: Functor φ => (β -> γ) -> φ (α -> β) -> φ (α -> γ) infixr 4

Applicative functional composition between a pure function and an applicative function.

(>$>) :: Functor φ => φ (α -> β) -> (β -> γ) -> φ (α -> γ) infixr 4

Applicative functional composition between a pure function and an applicative function with its arguments flipped.

(<.>) :: Applicative φ => φ (β -> γ) -> φ (α -> β) -> φ (α -> γ) infixr 4

Deprecated: use <*< instead

Functional composition for applicative functors.

This is a rather popular operator. Due to conflicts (for instance with the lens package) it may have to be imported qualified.

(⊙) :: Applicative φ => φ (β -> γ) -> φ (α -> β) -> φ (α -> γ) infixr 4

Deprecated: use <*< instead

For people who like nicely aligned code and do not mind messing with editor key-maps: here a version of <.> that uses a unicode symbol

The hex value of the UTF-8 character ⊙ is 0x2299.

A convenient VIM key-map is:

iabbrev <buffer> ../ ⊙