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Example code of ekiwok/option

Informations about the package option

PHP Option Build Status

Option is a value that might or might not be present. In other words it's elegant alternative to throwing an exception or allowing method to return null. It allows for fluent chaining method calls.

Instead of either:

Just have:

Allow null approach:

Option approach:

In contrary to other libraries this one implements separate Option for each scalar type and allows registering custom Options for objects. It's the closest to Java templates we can get and enforces strict type checking.

So if you prefer strict type checking over having a few opcodes less, you can enforce:

Optional::Some wraps each value to correct Option class:

Installation

With composer: composer require ekiwok/option

Interface

All scalar options enforce that methods get, orElse, orElseGet, orElseThrow returns the same scalar.

So it's not possible to orElse float from OptionString:

The only exception is Optional which does not enforce types.

Important thing to notice is that when you map Option which is None it will return Optional.

This is because there is no reasonable way to guess what should be the type of the value returned by a $supplier. In Some we are able to wrap accordingly to the type of the returned value.

On top of that you probably do not care about mapping when you're dealing with None because all further mappings will also return None.

But if you really want to ensure that, for example, orElseGet $supplier returns value of correct type you might provide expected type as another map parameter:

Custom mappings

Simply register custom mappings:

Any

If you don't want to get specific type like, for example, OptionString you can wrap $value into Any

Autogenerating options

There is experimental bin/generator.php for autogenerating custom Option classes.

It accepts full class name (including namespace) as first argument and optionally desired namespace as second argument (if not provided default namespace is class namespace prefixed with autoload).

So to generate OptionDateTime one could do:

vendor/ekiwok/opion/bin/generator.php \DateTime > ./autogenerated/OptionDateTime.php

All versions of option with dependencies

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