Documentation

Parse a string to Int.

>>> readMaybeInt "1"
Just 1

>>> readMaybeInt "one"
Nothing

Parse a string to Double.

>>> readMaybeDouble "1.0"
Just 1.0

>>> readMaybeDouble "1"
Just 1.0

Parse a string to Bool.

>>> readMaybeBool "true"
Just True

>>> readMaybeBool "FALSE"
Just False

Parse a string to Day.

>>> readMaybeDay "2020-01-01"
Just 2020-01-01

>>> readMaybeDay "2020/01/01"
Nothing

Parse a string to TimeOfDay.

>>> readMaybeTimeOfDay "12:34:56"
Just 12:34:56

>>> readMaybeTimeOfDay "12:34:56.789"
Just 12:34:56.789

Parse a string to UTCTime.

>>> readMaybeUTCTime "2020-01-01T12:34:56Z"
Just 2020-01-01 12:34:56 UTC

>>> readMaybeUTCTime "2020-01-01T12:34:56+09:00"
Nothing

Wrapper function of readMaybe that returns Nothing if a string has leading/trailing whitespaces.

>>> readMaybe' "1" :: Maybe Int
Just 1

>>> readMaybe' " 1" :: Maybe Int
Nothing

>>> readMaybe' "1 " :: Maybe Int
Nothing

Capitalize a string.

>>> capitalize "foo"
"Foo"

>>> capitalize "FOO"
"Foo"