safe
Library of safe (exception free) functions
https://github.com/ndmitchell/safe#readme
| LTS Haskell 22.39: | 0.3.21@rev:1 |
| Stackage Nightly 2024-10-29: | 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:b928ea1645876788155b38ce85c7e46d157a1bb41d2b05f5770b13d60bc6a3f7,2400Module documentation for 0.3.21
Depends on 1 package(full list with versions):
Used by 49 packages in nightly-2024-09-10(full list with versions):
aws, citeproc, conduit-parse, cubicspline, doclayout, doctemplates, errors, feed, graph-core, haskell-gi, haskoin-core, hledger, hledger-lib, hledger-stockquotes, hledger-ui, hledger-web, hoogle, hw-excess, jmacro, koji-tool, lsp-types, midair, monad-bayes, nonempty-zipper, om-elm, pager, pandoc, pandoc-cli, pandoc-lua-marshal, quickbench, rss-conduit, sandwich, sandwich-slack, sandwich-webdriver, servant-client-core, shelltestrunner, simple-prompt, skylighting-core, statistics-linreg, store, and many more
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.