/**
* @param callable $hof
* @return Success|Failure
*/
function Attempt(callable $hof)
{
try {
return Success(call_user_func($hof));
} catch (\Exception $e) {
return Failure($e);
}
}
public function testFlatMap()
{
$c = Rescue($this->theNumber7());
$c = $c->flatMap(function ($v) {
return Failure(new RuntimeException());
});
$this->assertThat($c->getOrElse(1), $this->equalTo(1));
}
/**
* @param callable $hof (): Attempt
* @return Attempt
* @throws \Exception on function not returning a Attempt subtype
*/
public function orElse(callable $hof)
{
if ($this->isSuccess()) {
return $this;
}
try {
$result = $hof();
} catch (\Exception $e) {
return Failure($e);
}
return static::assertRootType($result);
}
/**
* @inheritdoc
*/
public function transform(callable $success, callable $failure)
{
try {
$result = call_user_func($success, $this->value, $this);
} catch (\Exception $e) {
return Failure($e);
}
return static::assertRootType($result);
}