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Example code of vcn/enum

Informations about the package enum

enum

Enumeration data types with pattern match operations.

Quickstart

composer require vcn/enum

Motivation

An enum (or enumeration), is a data construct describing a value that can be exactly one of a distinct, predefined set of values.

We could for instance model fruit - where we only consider apples and bananas as fruit - as follows (using ADTs):

A fruit is either an apple or banana - not both, nor neither.

Here Fruit is the enumerable type and Apple and Banana are its labels (its possible values, or instances).

This implementation tries to come close to the expressive power above.

Usage

To express the above using this implementation, firstly extend Enum to define Fruit:

(Making the class final is recommended, as further inheritance is not supported and will produce warnings.)

Then define the labels as constant members of Fruit:

(The constant values (0s) are meaningless, but required by PHP.)

This will expose the labels as magic static methods Fruit::APPLE() and Fruit::BANANA(). They serve as the constructors of the corresponding labels. It is recommended to annotate them as class members in the docblock:

Now you can instantiate either label:

You can test for equality:

You can pattern match on labels:

You can stringify and unstringify label names:

You can check a collection for exhaustiveness:

All versions of enum with dependencies

PHP Build Version
Package Version
Requires php Version ^8.0
ext-json Version *
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