Add whenMissing, which takes user-supplied fns#1185
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meooow25 wants to merge 1 commit intohaskell:masterfrom
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Add whenMissing, which takes user-supplied fns#1185meooow25 wants to merge 1 commit intohaskell:masterfrom
meooow25 wants to merge 1 commit intohaskell:masterfrom
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This allows for some useful applications which are currently not possible with the non-internal API. The functions carry a warning that the two input functions are related by a law and the user is responsible for satisfying it. Export filterA for Set, now that it is referred to from whenMissing.
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I decided to go with the simple approach from #1054. Just a note that I haven't added this function to the |
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This allows for some useful applications which are currently not possible with the non-internal API. The functions carry a warning that the two input functions are related by a law and the user is responsible for satisfying it.
Export filterA for Set, now that it is referred to from whenMissing.
Closes #1054