Just a quick look on Github, filtering for uses of fromJust rather than re-declarations (mostly), shows 9,418 uses. https://github.com/search?utf8=%E2%9C%93&q=extension%3Ahs+fromJust+%22import+Data.Maybe%22&type=Code&ref=searchresults Searching for imports of Data.Maybe alone come to 19,985, indicating that at least ~half of the time people import Data.Maybe, they're using fromJust. https://github.com/search?utf8=%E2%9C%93&q=extension%3Ahs+%22import+Data.Maybe%22&type=Code&ref=searchresults As a baseline, Data.List shows up 28k times. https://github.com/search?utf8=%E2%9C%93&q=extension%3Ahs+%22import+Data.List%22&type=Code&ref=searchresults This is just from a 3 minute glance. If we really want to narrow it down to Hackage I'll do something more thorough. On 02/24/2015 12:13 AM, Bardur Arantsson wrote:
On 24-02-2015 06:42, Erik de Castro Lopo wrote:
Hi all,
We currently have in the Data.Maybe module from base:
fromJust :: Maybe a -> a
which newbies often find using hoogle or other search tools and is a huge trap. *Every* usage of the above can be replaced by using
fromMaybe :: a -> Maybe a -> a
which forces the user to provide a default value for the case where the Maybe a is a Nothing.
The idea would be to deprecate fromMaybe for 7.12 and remove it completely later.
Comments?
How much code on Hackage is currently using fromJust? (A rough estimate by group would probably be sufficient.)
Regards,
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