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@ 2020-12-05T20:38:11Z

<?php

class Maybe {
    
    private function __construct(private mixed $value = null) {}
    
    public static function None(): static {
        return new static(null);
    }
    
    public static function Some(mixed $v): static {
        return new static($v);
    }
    
    public function value(): mixed {
        return match ($this->value) {
            null => throw new Exception(),
            default => $this->value,
        };
    }
    
    public function __invoke(callable $c): static {
        return match ($this->value) {
            null => $this,
            default => static::Some($c($this->value)),
        };
    }
}

function double($x) {
    return $x * 2;
}


$res =  Maybe::Some(30)
  ('double')
  ('chr')
  (fn($x) => strlen($x));

var_dump($res->value());

Output for git.master, git.master_jit, rfc.property-hooks: int(1)

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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