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Date: Wed, 15 Jul 2020 18:59:38 +0200
Message-ID: <CADyq6sLTLG5bZtv3TC0-ra-M6wMswLpMVCT4L=MCnOjtKfb5fg@mail.gmail.com>
To: Larry Garfield <larry@garfieldtech.com>
Cc: php internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] [RFC][Discussion] Objects can be declared falsifiable
From: ocramius@gmail.com (Marco Pivetta)

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Hey Larry,
<http://ocramius.github.com/>


On Wed, Jul 15, 2020 at 6:55 PM Larry Garfield <larry@garfieldtech.com>
wrote:

> I disagree entirely.  The value of a Maybe over just null is
>
> 1) You can bind to it even if the result is empty; the "if is null" check
> gets abstracted away from the main code.
>

That's correct: that's how the `Maybe` monad works too.


> 2) You are forced to unwrap/extract the value if you're not just binding,
> which makes it less likely you'll forget to check if it's null


No need to unwrap: that's what `>>=` does for you.

Assuming you use psalm or phpstan, a program that doesn't use `>>=`, or
forgets to check for `null` on `?T` does not type-check anyway, and can be
rejected before even writing any runtime tests: that's sound.

Marco Pivetta

http://twitter.com/Ocramius

http://ocramius.github.com/

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