Option

Option is a monadic container type which represents an optional value. Instances of Option are either an instance of Some or an instance of None.

A typical use case of the option is to return a value that may or may not exist. In this way we can get rid of the need for a null to exist.

Construction

The option can be created in 4 different ways. The simple one is named constructor of:

/** @var Option<Success> $option */

$option = Option::of(domainOperation());

$option->getOrElse('default');

If the method of receive a null then the option becomes None (is empty). The next two constructors create an option of the selected type:

$some = Option::some('value');

$none = Option::none();

There is one more contructor available ::when(bool $condition, $value), when $condition will be true, then Some is returned, in other case None will occurs:

$option = Option::when(someOperation(), 5);