funprog-package {funprog}

Implementation of pure functional programming languages functions

Description

The funprog package implements in R some functions existing in other pure functional programming languages.

Main functions

The package provides high-order functions, for example :

• group_if, inspired by Haskell's groupBy

• sort_by, inspired by Haskell's sortBy

Helper functions

Helper functions can be used in conjunction with the main functions :

• %on% combines two functions into one and serves to create a predicate function to group_if

• descending is used to reverse the output of a sorting function used with sort_by

purrr syntax

If the purrr package is installed, you can use its special syntax to create very compact anonymous functions, for example ~ abs(.x - .y) > 1 instead of function(x, y) abs(x - y) > 1.