Lens
A shortcut for the combine lens which combines two lenses.
Given a parent JsValue extracts and converts a JsValue into a value of
type T or throws an exception.
Given a parent JsValue extracts and converts a JsValue into a value of
type T or throws an exception.
Lifts a predicate for a converted value for this lens up to the parent level.
Lifts a predicate for a converted value for this lens up to the parent level. The returned predicate will return false for values which fail to read.
Given a parent JsValue, tries to extract the child value.
Given a parent JsValue, tries to extract the child value.
Right(value) if the lens read succeeds. Left(error) if the lens read fails.
Given a parent JsValue extracts and tries to convert the JsValue into
a value of type T
Given a parent JsValue extracts and tries to convert the JsValue into
a value of type T
Applies function f on the child of the parent denoted by this UpdateLens
and returns a Right of the parent with the child element updated.
Applies function f on the child of the parent denoted by this UpdateLens
and returns a Right of the parent with the child element updated.
The value passed to f may be Left(e) if the child could not be found
in which case particular operations may still succeed. Function f may return
Left(error) in case the operation fails.
updated returns Left(error) if the update operation or any of any intermediate
lens fails.
A Lens combines read and update functions of UpdateLens and ReadLens into combinable chunks.
A lens can either operate on a scalar value, or on an optional value, or on a sequence value. This is denoted by the
M[_]type constructor.