Result

Stream

Returns single value stream or empty stream, if there is a problem

Check contains

Returns 'true' if result contains given value

'false' - otherwise

  val r : Result[String] = "foo"

  r.contains("foo").tp  // Prints: true

  r.contains("bar").tp  // Prints: false

Reversed filter

If the result value does satisfy given predicate, the problem is created with given function

The result with problem is not affected at all

val r : Result[String] = "foo"

r.drop(_.length < 2, "'" + _ + "' is too short").tp  // Prints Result(foo)

r.drop(_.length < 4, "'" + _ + "' is too short").tp  // Prints Result(Problem('foo' is too short))

Process problem

Executes given function if there is a problem

Returns option itself

Process value

Executes given function with value

Does nothing if there is a problem

Returns result itself

Problem check

Returns true if there is a problem, false if there is a value

Value check

Returns true if there is a value, false if there is a problem

Convert value

Creates new result with value converted by the given function

Results with problem are cast to a new type without change

  "Abc".??.map(_.length).tp  // Prints: Result(3)

Map result

Results with problem are cast to a new type without change

Otherwise, value is converted to a new result by given function.

Value or default

Returns result value, or if there is a problem, then given default value

Get problem

Returns problem, fails if there is a value

Generally use problem_? instead

Optional problem

Returns problem option, which is void if there is a value

Process value or problem

Executes either given function for value or problem

Returns result itself

Optionally fix problem

Results with value are not affected

Given function is run with problem and optional value is returned. If option is not void, result value is restored

Filter

If the result value does not satisfy given predicate, the problem is created with given function

The result with problem is not affected at all

val r : Result[String] = "foo"

r.take(_.length < 2, "'" + _ + "' is too long").tp  // Prints Result(Problem('foo' is too long))

r.take(_.length < 4, "'" + _ + "' is too long").tp  // Prints Result(foo)

To Scala Try

Result is converted to scala.util.Try, which is a natural fit

Get value

Returns result value, fails if there is a problem

Generally use value_? instead

Optional value

Returns value option, which is void if there is a problem

Type alias

Shortcut to Result.Problem

Companion alias

Shortcut to Result.Problem