Opt._libraryExtension 

As Stream

Returns Stream with single value or empty

Default value

Only if there is no value, creates new option with default value

var o : Opt[String] = "foo"

o = o.default("bar")

println(o)  // Prints: Opt(foo)

o = \/

o = o.default("bar")

println(o)  // Prints: Opt(bar)

Value or default

Returns value, or if none, then given default

var o : Opt[String] = "foo"

println(o or "bar")    // Prints: foo

o = \/                 // assigning Opt.Void

println(o or "bar")    // Prints: bar

Default option

Returns this Opt, or if it is void, then given default

var o1 : Opt[String] = "foo"
val o2 : Opt[String] = "bar"

println(o1 orOpt o2)  // Prints: Opt(foo)

o1 = \/

println(o1 orOpt o2)  // Prints: Opt(bar)

To Option

Converts to scala.Option

To Optional

Converts to java.util.Optional