on package:relude is:module

One is a typeclass for creating structures from a singleton element. It has three main goals:

1. Give a shorter name for the construction: uses one instead of common singleton.
2. Work with monomorphic structures like Text or IntSet.
3. Give a clearer and less scary name for cases where you can use pure or (:[]).

This module exports all container-related stuff.

Re-exports most useful functionality from the Control.Exception module. Also provides some convenient utilities to throw and handle exceptions.

This module reexports very basic and primitive functions and function combinators.

Lifted MVar and STM functions.

This module contains reexports from Data.List.NonEmpty and safe functions to work with list type in terms of NonEmpty. Note, that Relude reexports head, tail, init, last from Data.List.NonEmpty instead of the Data.List, so these functions are safe to use. TODO: table relude also provides custom type error for better experience with transition from lists to NonEmpty with those functions. Let's examine the behaviour of the relude list functions comparing to the corresponding base one on the example of the head function: TODO: table

Reexporting useful monadic stuff.

Reexports functions to work with monoids plus adds extra useful functions.

This module implements type class which allow to have conversion to and from Text, String and ByteString types (including both strict and lazy versions). Usually you need to export Text modules qualified and use pack / unpack functions to convert to/from Text. Now you can just use toText / toString functions.