Hands-On Design Patterns with Swift

Implementing mutable objects

Sourcery can also help generate a fully mutable class for your object using AutoMutable.stencil, as follows:

{% for type in types.implementing.AutoMutable %}class Mutable{{ type.name }} {    {% for member in type.variables %}    var {{ member.name }}: {{member.typeName}}    {% endfor %}    init(        {% map type.variables into vars using var %}        {{ var.name }}: {{ var.typeName }}{% endmap %}        {{ vars|join:"," }}) {        {% for member in type.variables %}        self.{{ member.name }} = {{member.name}}        {% endfor %}     }}{% endfor %}

This stencil will not replicate all instances and class methods—it will only generate a Mutable copy of a plain object.