safe: Library of safe (exception free) functions

[ bsd3, library, unclassified ] [ Propose Tags ]

A library wrapping Prelude/Data.List functions that can throw exceptions, such as head and !!. Each unsafe function has up to four variants, e.g. with tail:

This package is divided into three modules:


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Versions 0.2, 0.3, 0.3.1, 0.3.2, 0.3.3, 0.3.4, 0.3.5, 0.3.6, 0.3.7, 0.3.8, 0.3.9, 0.3.10, 0.3.11, 0.3.12, 0.3.13, 0.3.14, 0.3.15, 0.3.16, 0.3.17
Change log CHANGES.txt
Dependencies base (>=4.5 && <5) [details]
License BSD-3-Clause
Copyright Neil Mitchell 2007-2017
Author Neil Mitchell <ndmitchell@gmail.com>
Maintainer Neil Mitchell <ndmitchell@gmail.com>
Revised Revision 1 made by NeilMitchell at Thu Feb 9 23:00:11 UTC 2017
Category Unclassified
Home page https://github.com/ndmitchell/safe#readme
Bug tracker https://github.com/ndmitchell/safe/issues
Source repo head: git clone https://github.com/ndmitchell/safe.git
Uploaded by NeilMitchell at Sun Feb 5 16:24:28 UTC 2017
Distributions Arch:0.3.17, Debian:0.3.9, Fedora:0.3.15, FreeBSD:0.3.9, LTSHaskell:0.3.17, NixOS:0.3.17, Stackage:0.3.17, openSUSE:0.3.17
Downloads 163656 total (524 in the last 30 days)
Rating 2.25 (votes: 2) [estimated by rule of succession]
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Readme for safe-0.3.12

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A library wrapping Prelude/Data.List functions that can throw exceptions, such as head and !!. Each unsafe function has up to four variants, e.g. with tail:

  • <tt>tail :: [a] -> [a]</tt>, raises an error on tail [].
  • <tt>tailMay :: [a] -> <i>Maybe</i> [a]</tt>, turns errors into Nothing.
  • <tt>tailDef :: <i>[a]</i> -> [a] -> [a]</tt>, takes a default to return on errors.
  • <tt>tailNote :: <i>String</i> -> [a] -> [a]</tt>, takes an extra argument which supplements the error message.
  • <tt>tailSafe :: [a] -> [a]</tt>, returns some sensible default if possible, [] in the case of tail.

This package is divided into three modules:

  • Safe contains safe variants of Prelude and Data.List functions.
  • Safe.Foldable contains safe variants of Foldable functions.
  • Safe.Exact creates crashing versions of functions like zip (errors if the lists are not equal) and take (errors if there are not enough elements), then wraps them to provide safe variants.