phpfn/placeholder

Simple placeholder implementation for functional constructions

2.0.1 2020-11-22 21:17 UTC

Requires

• php: >=7.4
• phpfn/symbol: ^2.0.1
• symfony/polyfill-php80: ^1.0

Requires (Dev)

• phpunit/phpunit: ^9.0

MIT

• Kirill Nesmeyanov

• placeholder
• functional
• curry
• partial application
• high order

README

Library provides a placeholder implementation for currying functions, partial applications, pipe operator, and other syntactic structures hat allow specifying default values.

Installation

Library can be installed into any PHP application:

• Using Composer dependency manager
• The Force for the Jedi Developers

$ composer require phpfn/placeholder

In order to access library make sure to include vendor/autoload.php in your file.

<?php

require __DIR__ . '/vendor/autoload.php';

Usage

What is "placeholder"?

<?php

var_dump(is_placeholder('_'));
// expected output: false

var_dump(is_placeholder(_));
// expected output: true

For example we can replace each of the placeholders in the array with the required value.

<?php
use Fun\Placeholder\Placeholder;

$array = [1, _, 3, _];

$result = Placeholder::map($array, fn() => ' map ');

echo implode(', ', $result);

// expected output: "1, map, 3, map"

And... Thats all =)