safe
Library of safe (exception free) functions
https://github.com/ndmitchell/safe#readme
| Version on this page: | 0.3.18@rev:1 |
| LTS Haskell 22.34: | 0.3.21@rev:1 |
| Stackage Nightly 2024-09-10: | 0.3.21@rev:1 |
| Latest on Hackage: | 0.3.21@rev:1 |
This version can be pinned in stack with:
safe-0.3.18@sha256:6aa17f30b93a39f60e132fca490a3995db43bf32cf868708327a2f4b526c217f,2405Module documentation for 0.3.18
Depends on 1 package(full list with versions):
Used by 30 packages in lts-15.3(full list with versions):
avers, brittany, conduit-parse, cubicspline, doclayout, doctemplates, errors, feed, graph-core, haskell-gi, haskoin-core, hledger, hledger-lib, hledger-ui, hw-excess, intro, jose, kawhi, mbox, midair, pager, pandoc, pandoc-citeproc, servant-client-core, shelltestrunner, skylighting-core, threepenny-gui, th-reify-many, xlsx, yesod-auth
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.