public final function map(FunctionValue $transformation)
{
return $this->wrap(V::fn(function ($collector, $inp) use($transformation) {
$res = $collector->collect($inp)->force();
if ($res->isError()) {
return $res;
}
$res2 = $transformation->apply($res)->force();
// If mapping was successfull, the underlying value should
// be considered the origin of the produced value.
if (!$res2->isError() && !$res2->isApplicable()) {
return V::val($res2->get(), $res->origin());
}
return $res2;
}));
}
public function composeWith(FunctionValue $other)
{
return V::fn_w(function ($value) use($other) {
$res = $other->apply($value)->force();
return $this->apply($res)->force();
});
}