krakphp / fn Goto Github PK
View Code? Open in Web Editor NEWFunctional library for PHP with proper currying
Functional library for PHP with proper currying
Hi,
I noticed some functions (not
, id
, maybe others) are not listed/documented (I guess they have no tests and thus no documentation is automatically generated).
On a related note, I've seen some libraries use complement
for function negation and not
as a boolean negation; in case you wanted to rename the current not
before documenting it.
Hello and thank you for writing this library.
Whenever I'm defining a pipeline of functions to be applied immediately to a starting value, instead of being given a name and saved for later, I use the following utility function:
/**
* Accept an input and some callables, then apply the callables in order.
*
* @param $input Input to the computation.
* @param $callables Any number of callables to be composed using pipe().
* @return Final result of the computation.
*/
function applyTo($input, callable ...$callables) {
return f\pipe(...$callables)($input);
}
This enables a Bash-like, left-to-right / top-to-bottom style of pipeline definition and application, for those (like me) who find it more readable than the backwards style of compose():
$res = applyTo([1,2,3,4], // <- input
c\filter(fn ($x) => $x > 2), // <- first step
c\map(fn ($x) => $x * 3), // ...
c\toArray, // <- last step
);
assert($res == [9, 12]);
Here is a more complex example, showing how to use one applyTo() inside another:
$pages = [
(object)['slug'=>'about', 'name'=>'About Us'],
(object)['slug'=>'about', 'name'=>'About You'],
(object)['slug'=>'news', 'name'=>'Latest News'],
];
$duplicate = applyTo($pages,
c\groupBy(fn ($page) => $page->slug),
c\filter(fn ($group) => count($group) > 1),
c\map(fn ($pages) =>
"Pages with slug '{$pages[0]->slug}': " . applyTo($pages,
c\map(fn ($page) => "({$page->name})"),
c\join(", "),
)
),
c\join(". "),
);
assert($duplicate == "Pages with slug 'about': (About Us), (About You)");
Do you have any suggestions / critiques? Would you accept a pull request for this function?
I also thought about other calling styles, such as curried: applyTo($input)($fn1, $fn2...)
or array: applyTo($input, [$fn1, $fn2...])
but ultimately I decided to keep things simple.
Psalm is an incredibly powerful static analyzer that enables a level of type safety in a codebase that is typically very difficult to achieve with php.
Adding psalm typings for this codebase would be a great benefit for psalm users who also use this library. It could also be seen as a selling point for potential users of this library.
A declarative, efficient, and flexible JavaScript library for building user interfaces.
๐ Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
The Web framework for perfectionists with deadlines.
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. ๐๐๐
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
We are working to build community through open source technology. NB: members must have two-factor auth.
Open source projects and samples from Microsoft.
Google โค๏ธ Open Source for everyone.
Alibaba Open Source for everyone
Data-Driven Documents codes.
China tencent open source team.