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Example code of khalyomede/monad

Informations about the package monad

khalyomede/monad

Maybe, Option and Result monads for PHP.

Summary

About

I published on reddit an RFC proposal for what I called "enums constructor" (which happened to be an existing concept called "tagged unions"). Out of one comment, I shown how to chain calls to various ADT outcomes, in order to reduces pyramidal matches.

This got me into wanting to use more monads right now on my next projects. After searching on packagist.org, I did not found something that fits what I expected, so I decided to make my own version of how I think monads should look like in PHP.

Features

Prerequisites

Installation

Examples

1. Getting a file content

In this example, we will use the Maybe monad as result, and use it in our main code.

2. Get users from an SQL table

In this example, we will use the Result monad to return the list of users or an error from PDO.

3. Chain multiple outcomes

In this example, we will chain multiple times "then", similar to what is possible in other languages through "map".

If you remove the file, the result becomes

If you remove the write permission on this file, the result becomes

API

For a list of all possible functions, see the tests\unit folder.

Tests

All versions of monad with dependencies

PHP Build Version
Package Version
Requires webmozart/assert Version 1.11.0
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