add firstJustMap, allJustMap
#44
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allJustMapis onlyJustall unpacked values when all elements are mapped toJustfirstJustMapis a more general function offindsuggested in #12 which returns the first unpacked value that maps toJust.The
-Mapprefix names should be consistent withfilterMap,concatMap, ..., where "filter", "concat", ... are the actions performed after applying the map.The "firstJust" and "allJust" should be easier to understand than "find" (from what side?) and "traverse"/"sequence"/"combine" (all
Ok?, allJust? all non-empty? ...).Should we add
firstOkMapandallOkMaptoo?