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Within LTS Haskell 24.4 (ghc-9.10.2)

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Exact lookup

1. (.|.) :: Bits a => a -> a -> a

   base	Data.Bits

   Bitwise "or"

2. (.&.) :: Bits a => a -> a -> a

   base	GHC.Bits

   Bitwise "and"

3. (.|.) :: Bits a => a -> a -> a

   base	GHC.Bits

   Bitwise "or"

4. (.&&.) :: (Testable prop1, Testable prop2) => prop1 -> prop2 -> Property

   QuickCheck	Test.QuickCheck

   Conjunction: p1 .&&. p2 passes if both p1 and p2 pass.

5. (.&.) :: (Testable prop1, Testable prop2) => prop1 -> prop2 -> Property

   QuickCheck	Test.QuickCheck

   Nondeterministic choice: p1 .&. p2 picks randomly one of p1 and p2 to test. If you test the property 100 times it makes 100 random choices.

6. (.||.) :: (Testable prop1, Testable prop2) => prop1 -> prop2 -> Property

   QuickCheck	Test.QuickCheck

   Disjunction: p1 .||. p2 passes unless p1 and p2 simultaneously fail.

7. (.!=) :: Parser (Maybe a) -> a -> Parser a

   aeson	Data.Aeson

   Helper for use in combination with .:? to provide default values for optional JSON object fields. This combinator is most useful if the key and value can be absent from an object without affecting its validity and we know a default value to assign in that case. If the key and value are mandatory, use .: instead. Example usage:

   v1 <- o .:? "opt_field_with_dfl" .!= "default_val"
   v2 <- o .:  "mandatory_field"
   v3 <- o .:? "opt_field2"
   

8. (.:) :: FromJSON a => Object -> Key -> Parser a

   aeson	Data.Aeson

   Retrieve the value associated with the given key of an Object. The result is empty if the key is not present or the value cannot be converted to the desired type. This accessor is appropriate if the key and value must be present in an object for it to be valid. If the key and value are optional, use .:? instead.

9. (.:!) :: FromJSON a => Object -> Key -> Parser (Maybe a)

   aeson	Data.Aeson

   Retrieve the value associated with the given key of an Object. The result is Nothing if the key is not present or empty if the value cannot be converted to the desired type. This differs from .:? by attempting to parse Null the same as any other JSON value, instead of interpreting it as Nothing.

10. (.:!=) :: FromJSON a => Object -> Key -> Parser a

    aeson	Data.Aeson

    Retrieve the value associated with the given key of an Object. If the key is not present and the omittedField is Just x for some x, the result will be that x. This differs from .:?= by attempting to parse Null the same as any other JSON value, instead of using omittedField when it's Just.

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