safe
Library of safe (exception free) functions
https://github.com/ndmitchell/safe#readme
| Version on this page: | 0.3.21 |
| LTS Haskell 24.24: | 0.3.21@rev:1 |
| Stackage Nightly 2025-12-16: | 0.3.21@rev:1 |
| Latest on Hackage: | 0.3.21@rev:1 |
This version can be pinned in stack with:
safe-0.3.21@sha256:b238440f2939cdd44e9fae1bbc22eb057411328dd6e4cd54e1366b5c109982e2,2312Module documentation for 0.3.21
Depends on 1 package(full list with versions):
Used by 28 packages in nightly-2024-02-04(full list with versions):
aws, citeproc, conduit-parse, cubicspline, doclayout, doctemplates, errors, graph-core, haskell-gi, hoogle, hw-excess, jmacro, lsp-types, midair, nonempty-zipper, pager, pandoc, pandoc-lua-marshal, sandwich, sandwich-slack, servant-client-core, shelltestrunner, skylighting-core, statistics-linreg, store, sydtest, th-reify-many, unicode-show
Safe 
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:
- tail :: [a] -> [a], raises an error on
tail []. - tailMay :: [a] -> Maybe [a], turns errors into
Nothing. - tailDef :: [a] -> [a] -> [a], takes a default to return on errors.
- tailNote :: String -> [a] -> [a], takes an extra argument which supplements the error message.
- tailSafe :: [a] -> [a], returns some sensible default if possible,
[]in the case oftail.
This package is divided into three modules:
Safecontains safe variants ofPreludeandData.Listfunctions.Safe.Foldablecontains safe variants ofFoldablefunctions.Safe.Exactcreates crashing versions of functions likezip(errors if the lists are not equal) andtake(errors if there are not enough elements), then wraps them to provide safe variants.