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Example code of baethon/union

Informations about the package union

baethon/union

Provides utilities to define tagged unions.

Tagged unions?

I'm not good with words, yet folks from Folktale describe it nicely:

Modelling data is important for a range of reasons. From performance to correctness to safety. Tagged unions give you a way of modelling choices that forces the correct handling of them, unlike predicate-based branching, such as the one used by if statements and other common control flow structures.

Installation

Usage

To create a tag union it's required to create a class which extends Baethon\Union\AbstractUnion.

Also you need to define tags which will represent state of the union.

Signatures

Each tag has a definition (called signature), which can be defined using following syntax:

Parameters define whether a tag will hold any value(s) (called arguments). They're optional.

Working with unions

Union can be invoked using static constructor:

To work with the state of the union you should use matchWith(). It will return the value returned by the matching callback:

matchWith() will check if all possible branches are mapped:

It's possible to use wildcard map to cover all other cases:

You can use defined const values in mapping:

Testing

All versions of union with dependencies

PHP Build Version
Package Version
Requires php Version >=7.1
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