haskell-lens

来源： https://stackoverflow.com/questions/52553510/how-to-concatmap-over-all-key-value-pairs-in-an-aeson-object-using-lenses

来源： https://stackoverflow.com/questions/56468091/a-lens-for-getting-or-setting-a-record-field-determined-by-a-runtime-argument

来源： https://stackoverflow.com/questions/56468091/a-lens-for-getting-or-setting-a-record-field-determined-by-a-runtime-argument

问题 I've been starting at https://www.stackage.org/haddock/lts-12.1/lens-aeson-1.0.2/Data-Aeson-Lens.html and https://www.stackage.org/haddock/lts-12.1/lens-4.16.1/Control-Lens-Fold.html trying to figure out how to write an expression that allows me to construct something of the following type: import Data.Aeson as A functionIWant :: (Vector A.Value) -> (A.Value -> [a]) -> [a] 回答1: There are two lens functions that are used to "lift" regular Foldable -related functions to the lensy world: folded

问题 I've been starting at https://www.stackage.org/haddock/lts-12.1/lens-aeson-1.0.2/Data-Aeson-Lens.html and https://www.stackage.org/haddock/lts-12.1/lens-4.16.1/Control-Lens-Fold.html trying to figure out how to write an expression that allows me to construct something of the following type: import Data.Aeson as A functionIWant :: (Vector A.Value) -> (A.Value -> [a]) -> [a] 回答1: There are two lens functions that are used to "lift" regular Foldable -related functions to the lensy world: folded

问题 I've been starting at https://www.stackage.org/haddock/lts-12.1/lens-aeson-1.0.2/Data-Aeson-Lens.html and https://www.stackage.org/haddock/lts-12.1/lens-4.16.1/Control-Lens-Fold.html trying to figure out how to write an expression that allows me to construct something of the following type: import Data.Aeson as A functionIWant :: (Vector A.Value) -> (A.Value -> [a]) -> [a] 回答1: There are two lens functions that are used to "lift" regular Foldable -related functions to the lensy world: folded