safe
Library of safe (exception free) functions
https://github.com/ndmitchell/safe#readme
| Version on this page: | 0.3.19 |
| LTS Haskell 22.39: | 0.3.21@rev:1 |
| Stackage Nightly 2024-10-31: | 0.3.21@rev:1 |
| Latest on Hackage: | 0.3.21@rev:1 |
This version can be pinned in stack with:
safe-0.3.19@sha256:0910dafb8898f52bde4c646e560228a0fd08b1fca5457f222d2f5c0fad6d2039,2317Module documentation for 0.3.19
Depends on 1 package(full list with versions):
Used by 40 packages in lts-18.6(full list with versions):
citeproc, conduit-parse, cubicspline, doclayout, doctemplates, errors, eventstore, feed, ginger, graph-core, haskell-gi, hledger, hledger-lib, hledger-stockquotes, hledger-ui, hw-excess, intro, jose, kawhi, mbox, midair, nonempty-zipper, pager, pandoc, proto3-wire, sandwich, sandwich-slack, sandwich-webdriver, servant-client-core, shelltestrunner, skylighting-core, stackcollapse-ghc, store, sydtest, threepenny-gui, th-reify-many, xlsx, yesod-auth, yesod-paginator, zenacy-html
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.